IEEE 2016 PROJECTS. No. PROJECT TITLES YEAR ABSTRACT

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1 No. PROJECT TITLES YEAR ABSTRACT PROJECTS 001 Front-End Isolated Quasi-Z- Source DC-DC Converter Modules in Series for Photovoltaic High- Voltage DC Applications 002 A Single-Phase PV Quasi-Z- Source Inverter With Reduced Capacitance Using Modified Modulation and Double- Frequency Ripple Suppression Control A quasi-z-source modular cascaded converter (qzs- MCC) is proposed for high-voltage (HV) dc integration of photovoltaic (PV) power. The qzs-mcc comprises frontend isolated qzs half-bridge (HB) dcdc converter sub modules (SMs) in series. By the qzs- HB handling PV voltage and power variations, a unified duty cycle is applicable for the front-end isolation converter of all SMs. Resultantly, the proposed system improves the quasi-z-source cascaded multilevel inverter and the modular multilevel converter based PV counterparts in terms of no double-line-frequency pulsating power so as to low qzs impedance, HV dc collection of PV power thus to reduce conversion stages for dc transmission, and overcoming the limit of series-output voltage with simple galvanic isolation. Operating principle and power loss evaluation of the qzs-mcc are presented. Parameter design guidelines and simulation are addressed based on a 60- kw SM; experimental results are carried out on a downscaled prototype as a proofof-concept, demonstrating the validity of the proposed system. In single-phase photovoltaic (PV) system, there is Double-frequency power mismatch existed between the dc input and ac output. The double-frequency ripple (DFR) energy needs to be buffered by passive network. Otherwise, the ripple energy will flow into the input side and adversely affect the PV energy harvest. In a conventional PV system, electrolytic capacitors are usually used for this purpose due to their high capacitance. However, electrolytic capacitors are considered to be one of the most failure prone components in a PV inverter. In this paper, a capacitance reduction control strategy is proposed to buffer the DFR energy in single-phase Z-source/quasi- Z-source inverter applications. Without using any extra hardware components, the proposed control

2 003 High-Gain Single-Stage Boosting Inverter for Photovoltaic Applications 004 Highly Efficient Asymmetrical PWM Full-Bridge Converter for Renewable Energy Sources 005 A High-Efficiency Flyback Micro-inverter With a New Adaptive Snubber for Photovoltaic Applications Strategy can significantly reduce the capacitance requirement and achieve low input voltage DFR. Consequently, highly reliable film capacitors can be used. The increased switching device voltage stress and power loss due to the proposed control strategy will also be discussed. A 1-kW quasi-z-source PV inverter using gallium nitride (GaN) devices is built in the lab. Experimental results are provided to verify the effectiveness of the proposed method. This paper introduces a high-gain single-stage boosting inverter (SSBI) for alternative energy generation. As compared to the traditional two-stage approach, the SSBI has a simpler topology and a lower component count. One cycle control was employed to generate ac voltage output. This paper presents theoretical analysis,simulation and experimental results obtained from a 200 W prototype. The experimental results reveal that the proposed SSBI can achieve high dc input voltage boosting, good dc ac power decoupling,good quality of ac output waveform, and good conversionefficiency. This paper presents a highly efficient asymmetrical pulse-width modulated (APWM) fullbridgeconverter for renewable energy sources. The proposed converter adopts full-bridge topology and asymmetric control scheme to achieve the zero-voltage switching (ZVS) turn-on of the power switches of the primary side and to reduce the circulating current loss. Moreover, the resonant circuit composed of the leakage inductance of the transformer and the blocking capacitor provides the zero-current switching (ZCS) turn-off for the output diode without the help of any auxiliary circuits. Thus, the reverse recovery problem of the output diode is eliminated. In addition, voltage stresses of the power switches are clamped to the input voltage. Due to these characteristics, the proposed converter has the structure to minimize power losses. It is especially beneficial to the renewable energy conversion systems. To confirm the theoretical analysis and validity of the proposed converter, a 400 W prototype isimplemented with the input voltage range from 40 to 80 V. Based on the hybrid operation of interleaved flyback micro-inverter in discontinuous and boundary conduction modes (DCM and BCM), a novel adaptive snubber is proposed in this paper. The proposed

3 006 An Optimal Method to Design a Trap-CL Filter for a PV AC- Module Based on Flyback Inverter 007 Highly Reliable Transformerless Photovoltaic Inverters With Leakage Current and Pulsating Power Elimination snubber limits the drain-to-source voltage overshoot of the flyback s main switch during the turn-off process,enabling the use of lower voltage MOSFETs. It also recovers the stored energy in the leakage inductance of the flyback transformer and provides soft switching for the main flyback switch by limiting the rising slope of the MOSFET voltage during the turn-off process resulting in higher efficiency. Exploiting the natural resonant of the flyback converter in BCM, the adopted controller provides ZVS and ZCS for the main switch during the BCM operation. The operation of the flyback microinverter with associated controllers is analytically studied, and considerations for an optimum design aiming to higher efficiency are presented. Performance ofthe flybackmicro-inverter with the proposed adaptive snubber and the corresponding controllers is experimentally verified based on a 250W interleaved flyback micro-inverter hardware setup. The power factor and total harmonic distortion (THD) are important considerations when designing an output filter.in the case of the photovoltaic (PV) acmodule, the size and weight also have to be taken into consideration. This paper proposes an output filter to reduce size and weight, and provides the optimal design method for a PV ac-module. The proposed output filter consists mainly of a conventional CL filter with a trap filter.the trap filter is used to eliminate the harmonic at the switching frequency that contains most of the harmonics. Therefore, total inductance and the size of the filter can be reduced although the output filter components are increased. This paper presents analysis of the proposed filter characteristics in detail. Also, an optimal design method reducing the size of the output filter components including the damping resistor is proposed. The proposed methods are verified on the experimental prototype rated at 320Wwith an ac-module based on the interleaved flyback inverter. The total filter inductance and volume are, respectively, reduced to 9.54% and 26.62% with the same performance. This paper presents a transformerless inverter topology, which is capable of simultaneously solving leakage current and pulsating power issues in gridconnected photovoltaic (PV) systems. Without adding any additional components to the system, the leakage

4 008 Transformerless Photovoltaic Inverter Based on Interleaving High-Frequency Legs Having Bidirectional Capability 009 Design and Analysis of a High- Efficiency DC DC Converter With Soft Switching Capability for Renewable Energy Applications Requiring High current caused by the PV-to-ground parasitic capacitance can be bypassed by introducing a common-mode (CM) conducting path to the inverter. The resulting ground leakage current is therefore well controlled to be below the regulation limit.furthermore, the proposed inverter can also eliminate the well-known double-line-frequency pulsating power that is inherent in single-phase PV systems. By properly injecting CM voltages to the output filter capacitors, the pulsating power can be decoupled from the dc-link. Therefore, it is possible to use long-lifetime film capacitors instead of electrolytic capacitors to improve the reliability of the PV system. The mechanism of leakage current suppression and the closed-loop control of pulsating power decoupling are discussed in this paper in detail. A 500- W prototypewas also built and tested in the laboratory, and both simulation and experimental results are finally presented to show the excellent performance of the proposed PV inverter. A novel bidirectional transformerless photovoltaic (PV) inverter based on the high-frequency leg (HFL) technique is proposed which can work on discontinuous current mode/continuous current mode having greatly enhanced reliability. With the highfrequency leg, the smooth ac current is achieved as the higher equivalent switching frequency can reduce the inductor current ripple decreasing the passive components volume. There is no dead time issue which can push the duty cycle to the theoretical limit and fully transfer the energy to grid through total pulse widthmodulation. And the capacity of the PV inverter can be expanded easily by increasing the number of high-frequency legs.additionally, the proposed topology can work under the rectifier mode having the bidirectional power capability, which is attractive for the PV application. In the end, the experimental results of 8- kw laboratory prototype have verified the feasibility and effectiveness of the proposed transformerless PV inverter under standalone mode. Renewable sources like solar photovoltaic (PV) and fuel cell stack are preferred to be operated at low voltages. For applications such as grid-tied systems, this necessitates high voltage boosting resulting in efficiency reduction. To handle this issue, this paper

5 Voltage Gain 010 Efficient Single Phase Transformerless Inverter for Grid-Tied PVG System With Reactive Power Control proposes a novel high voltage gain, high-efficiency dc dc converter based on coupled inductor, intermediate capacitor, and leakage energy recovery scheme. The input energy acquired from the source is first stored in the magnetic field of coupled inductor and intermediate capacitor in a lossless manner.in subsequent stages, it is passed on to the output section for load consumption. A passive clamp network around the primary inductor ensures the recovery of energy trapped in the leakage inductance, leading to drastic improvement in the voltage gain and efficiency of the system. Exorbitant duty cycle values are not required for high voltage gain, which prevents problems such as diode reverse recovery.presence of a passive clamp network causes reduced voltage stress on the switch. This enables the use of low voltage rating switch (with low ON-state resistance), improving the overall efficiency of the system. Analyticaldetails of the proposed converter and its hardware results are included. There has been an increasing interest in transformerless inverter for grid-tied photovoltaic (PV) system due to low cost, high efficiency, light weight, etc. Therefore, many transformerless topologies have been proposed and verified with real power injection only. Recently, almost every international regulation has imposed that a definite amount of reactive power should be handled by the grid-tied PV inverter. According to the standard VDEAR-N 4105, grid-tied PV inverter of power rating below 3.68KVA, should attain power factor (PF) from 0.95 leading to 0.95 lagging. IN this paper, a new high efficiency transformerless topology is proposed for grid-tied PV system with reactive power control. The new topology structure and detail operation principle with reactive power flow is described. The high frequency commonmode (CM) model and the control of the proposed topology are analyzed. The inherent circuit structure of the proposed topology does not lead itself to the reverse recovery issues even when inject reactive power which allow utilizing MOSFET switches to boost the overall efficiency. The CM voltage is kept constant at midpoint of dc input voltage, results low leakage current. Finally, to validate the proposed topology, a 1 kw laboratory prototype is built and tested. The experimental results

6 011 Single Phase Cascaded H5 Inverter with Leakage Current Elimination for Transformerless Photovoltaic System 012 Bus Voltage Control With Zero Distortion and High Bandwidth for Single-Phase Solar Inverters 013 A Medium Frequency Transformer-Based Wind show that the proposed topology can inject reactive power into the utility grid without any additional current distortion and leakage current. The maximum efficiency and European efficiency of the proposed topology are measured and found to be 98.54% and 98.29%, respectively. Leakage current reduction is one of the important issues for the transformelress PV systems. In this Paper, the transformerless single-phase cascaded H- bridge PV inverter is investigated. The common mode model for the cascaded H4 inverter is analyzed. And the reason why the conventional cascade H4 inverter fails to reduce the leakage current is clarified. In order to solve the problem, a new cascaded H5 inverter is proposed to solve the leakage current issue. Finally, the experimental results are presented to verify the effectiveness of the proposed topology with the leakage current reduction for the single phase transformerless PV systems. Single-phase inverters must include an energy storage device, typically a high-voltage bus capacitor, to match the inverter constant input power to its pulsating output power. Because of its increased cost, the size of this bus capacitor must be minimized. However, when the bus capacitor is small, the bus voltage includes a High ripple at the ac line second harmonic frequency, which causes harmonic distortion. The bus voltage controller must filter this ripple, while regulating the bus voltage efficiently during transients, and must therefore balance a tradeoff between two conflicting constraints, low-harmonic distortion and high bandwidth. This paper analyzes this tradeoff, and proposes a new control method for solving it without using addition hardware. Instead of reducing the Distortion by lowering the loop gain, the new controller employs a digital FIR filter that samples the bus voltage at an integer multiple of the second harmonic frequency. The filter presents a notch that removes the second harmonic ripple, enabling a design that operates with zero distortion and high bandwidth simultaneously, and is suitable for inverters with small bus capacitors. The proposed controller is tested on a micro inverter prototype with a 300-W photovoltaic panel and a 20-μF bus capacitor. Offshore wind farms with series-interconnected structures are promising configurations because bulky

7 Energy Conversion System Used for Current Source Converter Based Offshore Wind Farm 014 Sliding Mode Control of PMSG Wind Turbine Based on Enhanced Exponential Reaching Law 015 Control and Operation of a DC Grid-Based Wind Power Generation System in a and costly offshore substations can be eliminated. In this work, a medium-frequency transformer (MFT)- based wind energy conversion system is proposed for such wind farms based on current source converters. The presented configuration consists of a mediumvoltage permanent magnet synchronous generator that is connected to a low-cost passive rectifier, an MFTbased cascaded converter, and an onshore current source inverter. Apart from fulfilling traditional control objectives (maximum power point tracking, dc-link current control, and reactive power regulation), this work endeavors to ensure evenly distributed power and voltage sharing among the constituent modules given the cascaded structure of the MFT-based converter. In addition, this paper thoroughly discusses the characteristic of decoupling between the voltage/power balancing of the modular converter and the other control objectives. Finally, both simulation and experimental results are provided to reflect the performance of the proposed system. This paper proposes a Sliding Mode Control (SMC) based scheme for a variable speed, direct-driven Wind Energy Conversion Systems (WECS) equipped with Permanent Magnet Synchronous Generator (PMSG) connected to the grid. In this work, diode rectifier, boost converter, Neutral Point Clamped (NPC) inverter and L filter are used as the interface between the wind turbine and grid. This topology has abundant features such as simplicity for low and medium power wind turbine applications. It is also less costly than back-to-back two-level converters in medium power applications. SMC approach demonstrates great performance in complicated nonlinear systems control such as WECS. The proposed control strategy modifies Reaching Law (RL) of sliding mode technique to reduce chattering issue and to improve THD property compared to Conventional reaching law SMC. The effectiveness of the proposed control strategy is explored by simulation study on a 4 kw wind turbine, and then verified by experimental tests for a 2 kw set-up. This paper presents the design of a dc grid-based wind Power generation system in a poultry farm. The proposed system allows flexible operation of multiple

8 Microgrid 016 An Offshore Wind Generation Scheme With a High-Voltage Hybrid Generator, HVDC Interconnections,and Transmission 017 Grid-Connected PV-Wind Battery based Multi-Input Transformer Coupled Bidirectional DC-DC Converter for household Applications parallel-connected wind generators by eliminating the need for voltage and frequency synchronization. A model predictive control algorithm that offers better Transient response with respect to the changes in the operating conditions is proposed for the control of the inverters. The design concept is verified through various test scenarios to demonstrate the operational capability of the proposed micro grid when it operates Connected to and islanded from the distribution grid, and the results obtained are discussed. A new offshore high-voltage dc (HVDC) wind generation scheme is proposed in this paper. The scheme implements a high-voltage hybrid generator (HG) as well as HVDC interconnection and transmission systems. The turbine power train of the Proposed system is compared with a typical system installed in a commercial wind farm. The analyses demonstrate improvements in system losses and, hence, efficiency, power-train hardware, including Cable system mass and, importantly, a reduction in major component count and installed power electronics in the nacelle and turbine tower, features that lead to reduced capital cost and maintenance. The resulting power conversion system is more simplified and more amenable to higher voltage implementation Since it is not constrained by existing state-of-art power-electronic voltage source converter structures. Voltage control is facilitated via dc/dc converters located away from the turbine tower. To demonstrate the HG operational concept, measured results from a low-power laboratory prototype HG system are compared with analytical results and show good agreement. In this paper, a control strategy for power flow Management of a grid-connected hybrid PV-windbattery based system with an efficient multi-input transformer coupled bidirectional dc-dc converter is presented. The proposed system aims to satisfy the load demand, manage the power flow from different sources, inject surplus power into the grid and charge the battery from grid as and when required. A transformer coupled boost half-bridge converter is used to harness power from wind, while bidirectional buck-boost converter is used to harness power from PV along with battery charging/discharging control. A single-phase full-bridge bidirectional converter is used

9 018 Design and Real-Time Controller Implementation for a Battery-Ultracapacitor Hybrid Energy Storage System For feeding ac loads and interaction with grid. The proposed converter architecture has reduced number of power conversion stages with less component count, and reduced losses compared to existing grid connected hybrid systems. This improves the Efficiency and reliability of the system. Simulation results obtained using MATLAB/Simulink show the performance of the proposed control strategy for power flow management under various modes Of operation. The effectiveness of the topology and efficacy ofthe proposed control strategy are validated through detailed experimental studies, to demonstrate the capability of the system Operation in different modes. In this work, two real-time energy management strategies have been investigated for optimal current split between batteries and ultra capacitors (UCs) in electric vehicle (EV) applications. In the first strategy, an optimization problem is formulated and solved using Karush-Kuhn-Tucker (KKT) conditions to obtain the real-time operation points of current split for the hybrid energy storage system (HESS). In the second strategy, a neural network based strategy is implemented as an intelligent controller for the proposed system. To evaluate the performance of these two real-time strategies, a performance metric based on the battery state-of-health (SoH) is developed to reveal the relative impact of instantaneous battery currents on the battery degradation. A 38V-385Wh battery and a 32V-4.12Wh UC HESS hardware prototype has been developed and a real-time experimental platform has been built for energy management controller validation, using xpc Target and National Instrument data acquisition system (DAQ). Both the simulation and real-time experiment results have successfully validated the real-time implementation feasibility and effectiveness of the two real-time controller designs. It is shown that under a high speed, high acceleration, aggressive drive cycle US06, the two real-time energy management strategies can greatly reduce the battery peak current and consequently decreases the battery SoH reduction by 31% and 38% in comparison to a battery-only energy

10 019 Control and Implementation of a Standalone Solar Photo- Voltaic Hybrid System 020 Ultracapacitor-Battery Hybrid Energy Storage System Based on the Asymmetric Bidirectional Z-Source Topology for EV storage system. A control algorithm for a standalone solar photovoltaic (PV)-diesel-battery hybrid system is implemented in this paper. The proposed system deals with the intermittent nature of the energy generated by the PV array and it also provides power quality improvement. The PV array is integrated through a DC-DC boost converter and controlled using a maximum power point tracking (MPPT) algorithm to obtain the maximum power under varying operating conditions. The battery energy storage system (BESS) is integrated to the diesel engine generator (DG) set for the coordinated load management and power flow within the system. The admittance based control algorithm is used for load balancing, harmonics elimination and reactive power compensation under three phase four-wire linear and nonlinear loads. A four-leg voltage source converter (VSC) with BESS also provides neutral current compensation. The performance of proposed standalone hybrid system is studied under different loading co This paper proposes an ultra capacitor (UC)-battery Hybrid energy storage system (HESS) for electric vehicle based on asymmetric bidirectional Z-source topology. Compared with the conventional two-stage design, the HESS can be incorporated into the traction inverter system, leading to better performance and Lower cost. The UC energy can be effectively utilized due to the buck/boost characteristic in the Z-source converter; meanwhile, the battery converter gets eliminated in this case. The assumption about the symmetry in the Z-source topology impendence network states for the conventional analysis no longer applies to the proposed HESS configuration. The asymmetric characteristic related with the uneven power distribution of UCs and battery is mathematically excavated in detail. The frequency dividing coordinated control is proposed to exploit the advantages of UCs and battery. The battery peak current estimation is then investigated. Finally, The steady performance and transient response in both traction and regenerative modes are verified by simulation and experimental results.

11 021 Development of DC/DC Converter for Battery Energy Storage Supporting Railway DC Feeder Systems 022 High Efficiency Bi-Directional Converter for Flywheel Energy Storage Application 023 Series-Parallel Connection of Low-Voltage Sources for Integration of Galvanically Isolated Energy Storage Systems This paper describes the development of a bilateral DC/DC converter rated at 1500 V with a peak power of 500 kw for battery energy storage systems Supporting railway DC feeder systems. The DC/DC Converter converts regenerated power from a braking train and charges the batteries. The DC/DC converter discharges the stored energy to feed the train during powering. The converter main circuit and the control system are described, and successful test results obtained at the factory are reported. For the main circuit test, a special test method was applied. For the control system test, a real-time digital simulator was used for hardware-in-loop tests. In addition to the converter tests, the results from DC feeder system tests with an actual rectifier and battery bank are also Presented. A bidirectional converter (BDC) is essential in applications where energy storage devices are involved. Such applications include transportation, battery less UPS, Flywheel Energy Storage (FES) systems etc. Bidirectional power flow through buck and boost mode operation along with high power Density and efficiency are important requirements of such systems. This paper presents a new BDC topology using a combination of fast turn off SCR and IGBT with a novel control logic implementation to achieve zero switching losses through Zero Voltage Transition (ZVT) and Zero Current Transition (ZCT) techniques. The proposed scheme ensures Zero Switching Power Loss (ZSPL) for both buck and boost modes of operation of the BDC. The scheme is simple and achieves ZSPL during both turn-on and turn-off of the devices resulting in improved efficiency and reduced EMI problems. The basic principle of operation, analysis, and design procedure are presented for both Voltage buck and boost modes of operation of the proposed BDC topology. A design example is presented. Limitations of the system are highlighted. Experimental and simulation results obtained on a 4kW, 340V input prototype with a switching frequency of 15.4 khz are presented to verify the design. This work explores the Series-Parallel Connection of a Low Voltage Super capacitor Module to obtain Hybrid Energy Storage System for grid support applications. The Hybrid System is formed by the Super capacitor

12 024 An Interleaved Half-Bridge Three-Port Converter With Enhanced Power Transfer Capability Using Three-Leg Rectifier for Renewable Energy Applications Module itself, intended to ensure fast performance upon peak power requirements, together with a battery that provides the energy requirements. In the full system, the front end converter and the load interfacing converter share a common DC link. The battery is connected to the DC link by means of a Full- Bridge Current- Source bidirectional DC-DC converter. The Super capacitor Module is connected to the system using a Series-Parallel Configuration, which overcomes the main problems that arise with the most common topologies found in the literature. The full Operation of the system has been demonstrated theoretically and by simulations. A demonstration of such connection is shown experimentally, in a converter operating at reduced power levels, in order to validate the feasibility of thesystem.conclusions show how this scheme can be used in Hybrid Storage Systems In this paper, an interleaved half-bridge (IHB) threeport converter (TPC) is proposed for a renewable power system. The IHB-TPC is used to interface three power ports: 1) one source port; 2) one battery port; and 3) one isolated load port. The proposed IHB-TPC is derived by integrating two half bridge TPC modules. A parallel configuration is adopted for the primary side of the two half-bridge modules, while a parallel Series configuration is adopted for the secondary side of the two modules. The power can be transferred from the source and the battery to the load within the whole switching cycle with the proposed IHB-TPC. It means there are no additional conduction losses caused by the circulating current or the free-wheeling operation stage. Hence, the voltage gain can be extended, and the output filter can be reduced. Zerovoltage switching is realized for all the four main switches to reduce the switching losses. Two of the three ports can be tightly regulated by adopting pulse width modulation plus phase-shift control, while the third port is left unregulated to maintain power balance for the system. The operation principles and the performances of the proposed converter are analyzed in detail. The experimental results are Given to verify the feasibility and the effectiveness of the proposed converter.

13 025 Secondary-Side-Regulated Soft- Switching Full-Bridge Three- Port Converter Based on Bridgeless Boost Rectifier and Bidirectional Converter for Multiple Energy Interface 026 Analysis, Design, Modelling and Control of an Interleaved-Boost Full-Bridge Three-Port Converter for Hybrid Renewable Energy Systems A systematic method for deriving soft-switching Three-port converters (TPCs), which can interface multiple energy, is proposed in this paper. Novel fullbridge (FB) TPCs featuring single-stage power conversion, reduced conduction loss, and low voltage Stress are derived. Two no isolated bidirectional power ports and one isolated unidirectional load port are provided by integrating an interleaved bidirectional Buck/Boost converter and a bridgeless Boost rectifier via a high-frequency transformer. The Switching bridges on the primary side are shared; hence, the number of active switches is reduced. Primary-side pulse widthmodulation and secondaryside phase shift control strategy are employed To provide two control freedoms. Voltage and power regulations over two of the three power ports are achieved. Furthermore, the current/voltage ripples on the primary-side power ports are reduced due to the interleaving operation. Zero-voltage switching And zero-current switching are realized for the active switches and diodes, respectively. A typical FB-TPC with voltage-double rectifier developed by the proposed method is analyzed in detail. Operation principles, control strategy, and characteristics of the FB-TPC are presented. Experiments have been carried out to demonstrate the feasibility and effectiveness of the proposed topology derivation method. This paper presents the design, modelling and control of a three-port (TPC) isolated dc-dc converter based on interleaved-boost-full-bridge with pulse-widthmodulation and phase-shift control for hybrid renewable energy systems. In the proposed topology, the switches are driven by phase-shifted PWM signals, where both phase angle and duty cycle are controlled variables. The power flow between the two inputs is Controlled through the duty cycle, whereas the output voltage can be regulated effectively through the phaseshift. The primary side MOSFETs can achieve zerovoltage switching (ZVS) operation without additional circuitry. Additionally, due to the ac output inductor, the secondary side diodes can operate under zero current switching (ZCS) conditions. In this work, the operation principles of the converter are analyzed and the critical design considerations are discussed. The dynamic behavior of the proposed ac inductor based TPC is investigated by performing state-space

14 027 A Triple Active Bridge DC-DC Converter Capable of Achieving Full-Range ZVS 028 A Family of Isolated Buck-Boost Converters Based on Semiactive Rectifiers for High-Output Voltage Applications modelling. Moreover, the derived mathematical Models are validated by simulation and measurements. In order to verify the validity of the theoretical analysis, design and power decoupling control scheme, a prototype is constructed and tested under the various modes, depending on the availability of the Renewable energy source and the load consumption. The experimental results show that the two decoupled controlvariables achieve effective regulation of the power flow among the three ports. In this paper, a triple active bridge converter is Proposed. The topology is capable of achieving ZVS across the full load range with wide input voltage while minimizing heavy load conduction losses to increase overall efficiency. This topology comprises three full bridges coupled by a three-winding transformer. At light load, by adjusting the phase shift between two input bridges, all switching devices can maintain ZVS due to a controlled circulating current. At heavy load, the two input bridges work in parallel to reduce conduction loss. The operation principles of this topology are introduced and the ZVS boundaries are derived. Based on analytical models of power loss, a 200Wlaboratory prototype has been built to verify theoretical considerations. A systematic method for developing isolated buck boost (IBB) converters is proposed in this paper, and single-stage power conversion, soft-switching operation, and high-efficiency performance can be achieved with the proposed family of converters. On the basis of a nonisolated two-switch buck-boost converter, the proposed IBB converters are generated by replacing the dc buck-cell and boost-cell in the non- IBB converter with the ac buck-cell and boost-cell, respectively. Furthermore, a family of semi active rectifiers (SARs) is proposed to serve as the secondary Rectification circuit for the IBB converters, which helps to extend the converter voltage gain and reduce the voltage stresses on the devices in the rectification circuit. Hence, the efficiency is improved by employing a transformer with a smaller turns ratio and reduced Parasitic parameters, by using low-voltage rating MOSFETs and diodes with better switching and conduction performances. A full bridge IBB converter is proposed and analyzed in detail as an example. The phase-shift modulation strategy is applied to the

15 029 Flying-Capacitor-Based Hybrid LLC Converters With Input Voltage Autobalance Ability for High Voltage Applications 030 A DC DC Converter With High Voltage Gain and Two Input Boost Stages Full-bridge IBB converter to achieve IBB conversion. Moreover, soft-switching performance of all active switches and diodes can be achieved over a wide load and voltage range by the proposed converter and control strategy. A 380-V-output prototype is fabricated to verify the effectiveness of the proposed family of IBB converters, the SARs, and the control strategies. An advanced hybrid LLC series resonant converter With integrated flying-capacitor cell is proposed in this paper to enable the high step-down conversion in the high input voltage applications. The inherent flying-capacitor branch in the primary side can effectively halve the primary switch voltage stress compared with the half-bridge LLC converters. And the input voltage can be shared equally and automatically between the two series half-bridge modules without additional balance circuit or control strategies due to the built-in flying-capacitor cell. Moreover, the Inherent soft switching performance during wide load range that exists in the LLC converters is still kept to reduce the switching losses, which ensures the high efficiency. Besides, the proposed converter can be extended to further decrease the switch voltage Stress by employing stacked connection. Finally, V input 48 V- output 1 kw prototype is built and tested to verify the effectiveness of the proposed converter. The results prove that the proposed converter is an excellent candidate for the high input Voltage and high stepdown dc/dc conversion systems. A family of nonisolated high-voltage-gain dc dc Power electronic converters is proposed. The suggested topologies can be used as multiport converters and draw continuous current from two input sources. They can also draw continuous current from a single source in an interleaved manner. This versatility makes them appealing in renewable applications such as solar farms. The proposed converters can easily achieve a gain of 20 while benefiting from a continuous input current. Such a converter can individually link a PV panel to a 400-V dc bus. The design and component selection procedures are presented. A 400-W prototype Of the proposed converter with Vin = 20 and V out = 400 V has been developed to validate the analytical

16 031 High Gain DC DC Converter Based on the Cockcroft Walton Multiplier 032 A Three-State Switching Boost Converter Mixed With Magnetic Coupling and Voltage Multiplier Techniques for High Gain Conversion results. Recent advancements in renewable energy have created a need for both high step-up and highefficiency dc dc converters. These needs have typically been addressed with converters using high-frequency transformers to achieve the desired gain. The transformer design, however, is challenging. This paper presents a high step-up current fed converter based on the classical Cockcroft Walton (CW) multiplier. The capacitor ladder allows for high voltage gains without a transformer. The cascaded structure limits the voltage stresses in the converter stages, even for high gains. Being current-fed, the converter (unlike traditional CW multipliers) allows the output voltage to be efficiently controlled. In Addition, the converter supports multiple input operation without modifying the topology. This makes the converter especially suitable for photovoltaic applications where high gain, high efficiency, small converter size, and maximum power point tracking are required. Design equations, a dynamic model, and possible control algorithms are presented. The converter operation was verified using digital simulation and a 450-W prototype converter. An asymmetrical three-state switching boost converter, combining the benefits of magnetic coupling and voltage multiplier techniques, is presented in this paper. The derivation procedure for the proposed topology is depicted. The new converter can achieve a very high-voltage gain and a very low-voltage Stress on the power devices without high turn ratio and extreme duty cycles. Thus, the low-voltage-rated MOSFETs with low resistancerds (ON) can be selected to reduce the switching losses and cost. Moreover, the usage of voltage multiplier technique not only raises the voltage gain but also offers lossless passive clamp Performance, so the voltage spikes across the main switches are alleviated and the leakage-inductor energy of the coupled inductors can be recycled. In addition, the interleaved structure is employed in the input side, which not only reduces the current stress through each power switch, but also constrains the input current ripple. In addition, the reverse-recovery problem of the diodes is alleviated, and the efficiency

17 033 A Low-Volume Hybrid Step- Down Dc-Dc Converter Based on the Dual Use of Flying Capacitor 034 A Novel Transformer-less Interleaved Four-Phase Step- Down DC Converter With Low Switch Voltage Stress and Automatic Uniform Current- Sharing Characteristics can be further improved. The operating principles And the steady-state analysis of the presented converter are discussed in detail. Finally, a prototype circuit with 400-W nominal rating is implemented in the laboratory to verify the performance of the proposed converter. This paper introduces a hybrid step-down dc-dc converter, targeted for battery powered portable applications where low-volume implementation is the key priority. The introduced architecture, combining switched-capacitor (SC) and inductor based circuits, requires low-volume for implementation by reducing the size of the filer inductor by 4 times and the output capacitor by 2 times. In addition to supporting wide input-output range for step down voltage conversions, the introduced architecture demonstrates up to 15 % power processing efficiency improvement compared to conventional buck converter and faster dynamic response. These advantages are obtained by a dual use of the flying capacitor usually existing in SC converters. The flying capacitor is used for both balancing of the front-end stage and reducing voltage swing/stress of the components. Experimental results from a 5 V, 25 W, 500 khz prototype verify advantages of the introduced converter. In this paper, we propose a novel transformer-less direct current (dc) converter that features low switch voltage stress and automatic uniform current sharing. An interleaved four-phase voltage divider operating from a 400 V dc bus is used to achieve a high stepdown conversion ratio with a moderate duty ratio. Based on the capacitive voltage division, the proposed converter achieves two major objectives, i.e., increased voltage conversion ratio, due to energy storage in the blocking capacitors, and reduced voltage stress of active switches and diodes. As a result, the proposed converter permits the use of lower voltage rating MOSFETs to reduce both switching and conduction losses, thereby improving the overall efficiency. In addition, due to the charge balance of the capacitors, the proposed converter enables automatic uniform current sharing of the interleaved phases without adding extra circuitry or complex control methods. The operation principles and performance analyses of

18 035 Morphing Switched-Capacitor Step-Down DC DC Converters with Variable Conversion Ratio 036 High-Efficiency Coupled- Inductor-Based Step-Down Converter the proposed converter are presented, and its Effectiveness is verified by a 500Woutput power prototype circuit that converts 400 V input voltage into 24 V output voltage. High-voltage-gain and wide-input-range DC DC Converters are widely used in various electronics and industrial products such as portable devices, telecommunication, automotive, and aerospace systems. The two-stage converter is a widely adopted architecture for such applications, and it is proven to have a higher efficiency as compared with that of the single-stage Converter. This paper presents a modular-cell-based morphing switched-capacitor (SC) converter for application as a front-end converter of the two-stage converter. The conversion ratio of this converter is flexible and can be freely extended by increasing more SC modules. The varying conversion ratio is achieved through the morphing of the converter s structure corresponding to the amplitude of the input voltage. This converter is light and compact, and is highly efficient over a very wide range of input voltage and load conditions. Experimental results show that the efficiency of a single SC module is higher than 98%. This study mainly investigates a high-efficiency singleinput multiple-output (SIMO) step-down converter. The proposed converter can step down the voltage of a high-voltage dc bus generated by the rectifier of an ac utility power to a controllable low-voltage output terminal and middle-voltage output terminals. In this study, a coupled-inductor-based SIMO step-down Converter utilizes two power switches with the properties of voltage clamping for the middle-voltage switch, and soft switching for all power switches due to the appropriate choice of the corresponding device specifications. As a result, the leakage inductor energy of the coupled inductor can be recycled, and the voltage spikes on power switches can be alleviated. Moreover, the switching losses can be significantly decreased because of all power switches with Zero-voltage-switching features. Therefore, the objectives of high efficiency power conversion, high step-down ratio, and various output voltage with different levels can be obtained. The effectiveness Of the proposed SIMO step-down converter is verified by experimental results of a converter prototype in

19 037 Isolated Double Step-down DC- DC Converter with Improved ZVS Range and No Transformer Saturation Problem 038 A New Compact and High Efficiency Resonant Converter practical applications. In this paper, an isolated double step-down DC-DC converter with high efficiency and high step-down function is proposed. The proposed converter employs an additional capacitor in the primary side. Compared to the conventional full-bridge converters, the proposed converter has a double step-down feature with reduced voltage stress at the primary side of the transformer. Moreover, voltage stress of three primary side switches reduces to half of the input voltage and zero voltage switching (ZVS) is naturally achieved for all switches with lower output capacitor energy of the switches. Therefore, the proposed converter requires smaller leakage inductance than the conventional full-bridge converter. Without adding complexity to the hardware and control, the proposed converter inherently prevents transformer saturation problem caused by the DC component of the transformer. A 3-kW experimental prototype is constructed to verify the performance of the proposed converter. This paper explores a new resonant converter which features compact size, high efficiency, and compatibility with self-driven synchronous rectifiers. The proposed resonant converter and the LLC series resonant converter (LLC-SRC) are in the same threeelement resonant converter category and these two converters both consist of 2 inductors and one capacitor in their resonant tanks. While the LLC-SRC converter has all of its resonant elements on the input side, the proposed resonant converter has one of its resonant inductors on the output side. Utilizing the output resonant inductor allows the proposed resonant converter to implement self-driven synchronous rectifiers. When comparing the series resonant inductor in the LLC-SRC, the output inductor in the proposed resonant converter generally has lower cost and smaller size in voltage step down applications. Operational analysis of the proposed resonant converter is made through sinusoidal approximation. A 250W prototype of the proposed resonant converter is built to verify the analysis made in this paper and evaluate its performance. With the same soft-switching

20 039 A Sensitivity-Improved PFM LLC Resonant Full-Bridge DC- DC Converter with LC Anti- Resonant Circuitry 040 High-Efficiency LLC Resonant Converter With High Voltage Gain Using an Auxiliary LC Resonant Circuit characteristics as the LLC-SRC has, the proposed resonant converter can achieve 95.7% efficiency in a 430V to 27.5V/9A conversion even with diode rectifiers. An LLC resonant circuit-based full-bridge dc-dc converter with an LC anti-resonant tank for improving the performance of pulse-frequencymodulation (PFM) is proposed in this paper. The proposed resonant dc-dc converter, named as LLC-LC converter can extend a voltage regulation area below the unity gain with a smaller frequency variation ofpfm by the effect of the anti-resonant tank. This advantageous property contributes for protecting over-current in the case of The short-circuit load condition as well as the start-up interval in the designed band of switching frequency. The circuit topology and operating principle of the proposed converter is described, after which the design procedure of the operating frequency and circuit parameters is presented. The performances on the soft switching and the steady-state PFM characteristics of the LLC-LC converter are evaluated under the openloop control in experiment of a 2.5kW prototype, and its actual efficiency is compared with a LLC converter prototype. For revealing the effectiveness of the LLC-LC resonant circuitry, voltages and currents of the series and anti-resonant tanks are analyzed respectively with state-plane trajectories based on calculation and experiment, whereby the power and energy of each resonant tank are demonstrated. Finally, the feasibility of the proposed converter is evaluated from the practical point of view. To design an LLC resonant converter optimally in the wide input voltage range, the LLC resonant converter with high efficiency and high voltage gain using an auxiliary LC resonant circuit is proposed. In this paper, the auxiliary LC resonant circuit operates as a variable inductor according to the change of the switching frequency, and it is presented as an effective magnetizing inductance. In the nominal state, since the effective magnetizing inductance increases, the primary circulating current is decreased. Thus, the turn-off switching loss of the primary switches and the Primary conduction loss are minimized. During the hold-up time, the effective magnetizing inductance

21 041 Hybrid Bridgeless DCM SEPIC Rectifier Integrated with a Modified Switched Capacitor Cell 042 Multi-input Step-Up Converters Based on the Switched-Diode- Capacitor Voltage Accumulator decreases so that the proposed converter has a high voltage gain. As a result, an optimal design of the LLC resonant converter over the wide input voltage range is possible. The proposed converter is verified by experimental results with a V input and 350 W (56 V/6.25 A) output prototype. In this paper is proposed a novel single-phase PWM bridgeless rectifier, based on SEPIC converter topology, integrated with a modified switched capacitor cell. The structure has the absence of the diode bridge at the input port reducing the number of components and conduction losses. Besides, it has the Presence of a switched capacitor cell, providing double gain at the output voltage. A comparison with the conventional SEPIC shows that the proposed converter has lower voltage stress on the Semiconductors when both converters are designed for the same output voltage, and the same voltage stress across the semiconductors when the output voltage of the proposed converter is twice bigger than the conventional SEPIC. Therefore, the proposed structure can be applied in DCM SEPIC rectifiers improving the converter static gain, making it suitable For higher voltage applications. The paper also proposes a modified switched capacitor cell, which does not change the storage capacitor operation mode of the SEPIC rectifier. To validate the theoretical analyses a prototype of 500 W was built considering an input and an output voltage of 220 V and 400 V, Respectively, and a switching frequency of 50 khz. This paper introduces the application of switched diode- capacitor voltage accumulator (SDCVA) on conventional boost converter. This study aims to obtain two different kinds ofmulti-input step-up converters with high voltage gains, low component Stresses, low ripples, simple control, and high conversion efficiencies: one is based on the parallel SDCVA and the other based on the serial SDCVA. The double-input step-up converter based on the parallel SDCVA and the double-input step-up converter Based on the serial SDCVA are, respectively, taken as an example to do theoretical analysis, including operating principles and performance analyses when they work individually and simultaneously. The two proposed converters are implemented with a voltage

22 043 Split-Phase Control: Achieving Complete Soft-Charging Operation of a Dickson Switched-Capacitor Converter 044 A Bridgeless Totem-pole Interleaved PFC Converter for Plug-In Electric Vehicles closed-loop control at the switching frequency of 30 khz. Experimental results obtained from the implemented prototypes are provided to validate the feasibility and effectiveness of the proposed converters. Switched-capacitor (SC) converters are gaining popularity due to their high power density and suitability for on-chip integration. Soft-charging and resonant techniques can be used to eliminate the current transient during the switching instances, and Improve the power density and efficiency of SC converters. In this paper, we propose a split-phase control scheme that enables the Dickson converter to achieve complete soft-charging (or resonant) operation, which is not possible using the conventional two-phase control. An analytical method is extended to help in the analysis and design of split-phase controlled Dickson converters. The proposed technique and analysis are verified by both simulation and experimental results. An 8-to-1 step-down Dickson converter with an input voltage of 150 V and rated power of 36 W is built using GaN FETs. The converter prototype demonstrated a fivefold reduction in the output impedance (which corresponds to conduction Power loss) compared to a conventional Dickson converter, as a result of the split-phase controlled softcharging operation. This paper proposes a bidirectional bridgeless totempole interleaved power-factor-correction (PFC) converter using SiC MOSFETs as the front-end stage of an onboard charger for plug-in electric vehicles (PEVs). The proposed converter provides bidirectional operation enabling both grid-to-vehicle (G2V) charging and vehicle-to-grid (V2G)Ancillary services. The converter is suitable for efficient G2V V2G onboard charging due to its superiorities in terms of bidirectional operation, smaller current ripple, lower EMI, lower conduction losses and switching losses. A 3.3kW PFC converter is designed and developed, using Silicon-Carbide MOSFETs with fast recovery body diodes, for validation of and V2G operating modes. Utilizing SiC MOSFETs enables continuous current mode (CCM) operation of the totem-pole PFC converter in high-power applications. The converter is capable of converting 85Vac-265Vac line voltages into a Regulated dc voltage in the range of 300V to 600V. The Maximum efficiency of converter reaches up to

23 045 Full-Range Soft-Switching- Isolated Buck-Boost Converters With Integrated Interleaved Boost Converter and Phase- Shifted Control 99.2% with 0.99 power factor. A new method for deriving isolated buck-boost (IBB) Converter with single-stage power conversion is proposed in this paper and novel IBB converters based on high-frequency bridgeless interleaved boost rectifiers are presented. The semiconductors, conduction losses, and switching losses are reduced significantly by integrating the interleaved boost converters into the full-bridge diode-rectifier. Various high-frequency bridgeless boost rectifiers Are harvested based on different types of interleaved boost converters, including the conventional boost converter and high step-up boost converters with voltage multiplier and coupled inductor. The Full-bridge IBB converter with voltage multiplier is analyzed in detail. The voltage multiplier helps to enhance the voltage gain and reduce the voltage stresses of the semiconductors in the rectification circuit. Hence, a transformer with reduced turns ratio and parasitic parameters, and low-voltage ratedmosfets and diodes with better switching and conduction performances can be applied to improve the efficiency. Moreover, optimized phase-shift modulation strategy is applied to the full-bridge IBB converter to achieve isolated buck and boost conversion. What s more, soft-switching performance of all of the active switches and diodes within the Whole operating range is achieved. A 380-V output prototype is fabricated to verify the effectiveness of the proposed IBB converters and its control strategies. 046 A PWM Plus Phase-Shift Controlled Interleaved Isolated Boost Converter Based on Semiactive Quadrupler Rectifier for High Step-Up Applications Semi active quadruple rectifiers (SAQRs) are proposed in this paper to serve as the secondary rectification circuits, which make the secondary-side voltages to be controllable and help reduce current stress and conduction losses. An interleaved isolated boost converter is developed based on the proposed SAQRs. By utilizing the pulse-width modulation (PWM) plus phase-shift (PPS) control strategy, the primary- and secondary-side voltages are well matched to reduce the current values and circulating Conduction losses. With the proposed SAQRs, the voltage gain is extended and the voltage stresses on power devices and passive components used in

24 047 A Power Quality Improved Bridgeless Converter Based Computer Power Supply 048 Design and Implementation of a High Efficiency Multiple Output rectification circuits are reduced to the half of the high output voltage. Hence, the efficiency is improved by using a transformer with a smaller turn s ratio and reduced parasitic parameters, and by employing lowvoltage rating devices with better switching and conduction performance. With optimal design, lower voltage, and current stresses on the primary-side switches, minimized input current ripple can Be realized. Moreover, the zero-voltage turn on switching of the active switches and the zero-current turn off switching of the diodes can be achieved over a wide load and voltage range by the proposed SAQRbased converter and the control strategy. Meanwhile, the higher voltage gain, the lower voltage, and the current stresses on power devices can be obtained with the proposed SAQR-based converter compared with passive quadruple rectifier-based converter. The feasibility and effectiveness of the proposed SAQRs and the derived converter are verified by a 380-V output prototype. Poor power quality, slow dynamic response, high device stress, harmonic rich, periodically dense, peaky, distorted input current are the major problems which are frequently encountered in conventional switched mode power supplies (SMPSs) used in computers. To mitigate these problems, it is proposed here to use a non-isolated bridgeless buck-boost single ended primary inductance converter (SEPIC) in discontinuous conduction mode (DCM) at the front end of an SMPS. The bridgeless SEPIC at the front end provides stiffly regulated output dc voltage even under frequent input voltage and load variations. The output of the front end converter is connected to a half bridge dc-dc converter for isolation and also for obtaining different dc voltage levels at the load end that are needed in a personal computer. Controlling a single output voltage is able to regulate all the other dc output voltages as well. The design and simulation of the proposed power supply are carried out for obtaining an improved power quality which is verified through the experimental results. Multiple output converters (MOCs) are widely applied to applications requiring various levels of output

25 Charger based on the Time Division Multiple Control Technique voltages due to their advantages in terms of cost, volume, and efficiency. However, most of the conventional MOCs cannot regulate multiple outputs tightly and they can barely avoid the cross regulation problem. In this paper, the recently developed Time Division Multiple Control (TDMC) method, which can regulate all of the outputs with a high accuracy, is used for a multiple output battery charger based on the phase shift full bridge topology to simultaneously charge three batteries. The proposed charger is able to charge three different kinds of batteries or three of the same kind of battery in different state of charges (SOCs) independently and accurately with the constant current/constant voltage (CC/CV) charge method. As a result, the strict ripple specification of a battery can be satisfied for multiple battery charges without difficulty. In addition, the proposed charger exhibits a high efficiency since the soft switching of all of the switches during the entire charge process can be guaranteed. The operating principle of the converter and the design of the controller, including the statespace average modeling, will be detailed and the validity of the proposed method is verified through experiments. 049 Single-Stage AC/DC Single- Inductor Multiple-Output LED Drivers Various ac/dc LED driver topologies have been proposed to meet the challenges of achieving a compact, efficient, low-cost, and robust multistring LED lighting system. These LED drivers typically employ a two-stage topology to realize the functions Of ac/dc rectification and independent current control of each LED string. The choice of having two stage conversions involves additional hardware components and a more complicated controller design process. Such two-stage topologies suffer from a higher system Cost, increased power loss, and large form factor. In this paper, a single-stage ac/dc single-inductor multiple-output LED driver is proposed. It uses only one single inductor and N + 1 active power switches (N being the number of LED strings) with reduced Component count and smaller form factor. The proposed driver can achieve both functions of ac/dc rectification with a high power factor and precise independent current control of each individual

26 050 A Wide Load Range ZVS Push- Pull DC/DC Converter with Active-Clamped 051 A ZVS Pulsewidth Modulation Full-Bridge Converter With a Low-RMS-Current Resonant Auxiliary Circuit LED string simultaneously. A prototype of an arc/dc single-inductor triple-output LED driver is constructed for verification. Experimental Results corroborate that precise and independent current regulation of each individual LED string is achievable with the proposed driver. A power factor of above 0.99 and a peak efficiency of 89% at 30-W rated output power are attainable. A new active-clamped zero-voltage-switching (ZVS) push-pull converter is proposed in this paper. Compared with the conventional push-pull converter, one auxiliary switch Q 3 and a clamping capacitor C a is added in the primary side of the transformer to recycle the energy stored in the leakage inductors and clamp the voltage spike. Owing to the proposed converter which maintains ZVS of all the three switches from full load to very light load condition, switching losses are reduced significantly. The voltage stresses on switches that can be clamped at the input voltage plus the clamping capacitor voltage i.e., V in +V Ca, are much less than those of a conventional push-pull converter that enabling the use of low-voltage, low-performance and lower cost devices. In addition, the proposed topology can eliminate the problems of flux-imbalance existing in the conventional one. Detailed operation, analysis, design, comparative study and experimental results for the proposed converter are presented in this paper. An 800 W prototype was developed in the laboratory to evaluate and demonstrate the validity of the converter. This paper presents the description and analysis of a phase-shift-modulated full-bridge converter with a novel robust passive low-rms-current resonant auxiliary circuit for zero-voltage Switching (ZVS) operation of both the leading and lagging switch legs. Detailed time-domain analysis describes the steady-state behavior of the auxiliary circuit in different operating conditions. An in-depth comparative study between a fully specified baseline Converter and the equivalent converter using the proposed resonant auxiliary circuit is presented. For a similar peak auxiliary current to ensure ZVS operation, a minimum of 20% reduction in rms

27 052 A ZV-ZCS Electrolytic Capacitor-LessAC/DC Isolated LED Driver with Continous Energy Regulation 053 Wide ZVS Range Asymmetric Half-Bridge Converter With Clamp Switch and Diode for High Conversion Efficiency current is obtained, which decreases the conduction losses. Key characteristics and design considerations are also fully discussed. Experimental results from a 750-W prototype confirm the predicted enhancements using the proposed resonant auxiliary circuit. Conventional AC/DC LED drivers require a large Energy storage capacitor at the output to provide a constant current to the LEDs. In order to minimize the size and cost of the driver circuit, electrolytic capacitors are conventionally used due to its high energy density and low cost. However, electrolytic Capacitors are sensitive to operating temperature and have much shorter lifetime than the LED semiconductor devices, which significantly reduces the overall life time of the LED system. Another drawback with the current LED drivers is that the presence of the switching power losses restricts the use of high Frequency operation, which results in using bulky passive circuit components in the drivers and significantly reduces the circuit power efficiency. This paper proposes a single-stage high power factor LED driver with almost zero switching losses and without The electrolytic capacitor. In the proposed circuit, discontinuous conduction mode (DCM) boost converter was utilized as a power factor correction (PFC) circuit, where it was integrated with an Asymmetrical pulse width modulated (APWM) series resonant converter to form a single stage power conversion unit to drive the LEDs. The proposed circuit is able to achieve zero turn-on and turn-off switching operation and is able to eliminate the Conventionally needed electrolytic capacitors by continuously regulating the DC-link voltage. The proposed LED driver was simulated and tested on a 12W design example to confirm that an almost unity power factor and an efficiency of 95% can be achieved A conventional asymmetrical half-bridge (AHB) converter is widely used for dc dc stage in lowto medium power system. However, since the asymmetric operation of AHB converter causes the low efficiency over entire load condition, the conventional AHB converter is not usually considered for the candidate of server power system. In order to overcome the problems of the conventional AHB converter, a wide zero-voltage-switching (ZVS) range AHB converter with a clamp switch and a clamp diode

28 054 ZVS-ZCS High Voltage Gain Integrated Boost Converter For DC Microgrid 055 A CLCL Resonant DC/DC Converter for Two-Stage LED Driver System is proposed in this paper. The proposed AHB converter (PAHBC) replaces a low-side clamp diode with a MOSFET switch and adds an auxiliary winding, which changes the transformer turns-ratio. From these modifications and the pulse widthmodulation (PWM) control of clamp switch, the PAHBC can be designed optimally at nominal input condition and obtains additional dc gain at hold-up time condition. These advantages achieve the high conversion efficiency over the entire load condition. The operational principle and analysis of the PAHBC are presented in this paper and verified by a V input and 50 V/500 W output laboratory prototype A non-isolated soft switched integrated boost converter having high voltage gain is proposed for the module integrated PV systems, fuel cells and other low Voltage energy sources. Here a bidirectional boost converter is integrated with a resonant voltage quadrupler cell to obtain higher voltage gain. The auxiliary switch of the converter, which is connected to the output port acts as an active clamp circuit. Hence ZVS (zero voltage switching) turn on of the MOSFET switches are achieved. Coupled inductor s leakage energy is recycled to the output port through this auxiliary switch. In the proposed converter, all the diodes of the quadrupler cell are turned off with ZCS (zero current switching). This considerably reduces the high frequency turn off losses and reverse recovery losses of the diodes. ZCS turn off of the diodes also remove the diode voltage ringing caused due to the interaction of the parasitic capacitance of the diodes and the leakage inductance of the coupled inductor. Hence to protect the diodes from the voltage spikes, snubbers are not required. The voltage stress on all the MOSFETs and diodes are lower. This helps to choose switches of low voltage rating (low RDS(ON)) and thus improve the efficiency. Design and mathematical analysis of the proposed converter are made.a 250W prototype of the converter is built to verify the performance A CLCL resonant dc/dc converter has been proposed and analyzed in this paper for two-stage light-emitting diode (LED) drivers. The circuit performs zero voltage-switching (ZVS) turn-on and quasi zero current- switching (ZCS) turn-off. Then, a two-stage

29 056 A Novel LED Drive System Based on Matrix Rectifier 057 Three phase converter with galvanic isolation based on lossfree resistors for HB-LED lighting applications system has been designed using a power factor correction circuit before the proposed converter. Optimum input impedance angle, dead time, and components parameters have been achieved after thoughtful design, thus obtaining good soft-switching performance and reduced voltage stress. A 100-W prototype has been realized and tested demonstrating Its high feasibility and efficiency at full load and during dimming operations. This paper presents a novel LED drive system based On matrix rectifier. Matrix rectifier is applied to the LED drive system for the first time as to our knowledge. The novel LED drive system is composed of two stages. The first stage is the matrix rectifier, and the second stage is the multi-port two transistor Forward converters (TTFC) that share a leg. The space Vector modulation strategy of matrix rectifier and the modulation strategy of multi-port TTFC matched with rectifier stage are fully studied. In order to maintain the stability of output current, current PI closed-loop control is adopted for LED strings. Both simulation and experiment are carried out to verify the topology And modulation strategy of the proposed LED drive system. This work presents a driver for High-Brightness Light-Emitting Diodes (HB-LED) in three-phase grids, which complies with IEC Class C requirements, achieves high Power Factor (PF), low Total Harmonic Distortion (THD), as well as, the capability to achieve full dimming while disposing of the bulk capacitor and having galvanic isolation. The HB-LED driver is based on the use of six four-port cells with their inputs connected to the three-phase network and their outputs connected in parallel. Each one of these cells is a DC/DC converter operating as a Loss-Free Resistor (LFR) based on the concept of a flyback operating in Discontinuous Conduction Mode (DCM). Moreover, it operates in the full range of the European three-phase line voltage, which varies between 380V and 420V, and it supplies an output voltage of 48V with maximum power of 90W.

30 058 A Bidirectional Three-Level LLC Resonant Converter With PWAM Control 059 A New Family of Zero-Voltage- Transition Nonisolated Bidirectional Converters With Simple Auxiliary Circuit 060 Bidirectional Resonant DC DC Step-Up Converters for Driving High-Voltage Actuators in Mobile Microrobots This paper proposes a bidirectional three-level LLC Resonant converter with a new pulse width and amplitude modulation control method. With different control signals, it has three different operation modes with different voltage gains. Therefore, it can achieve wide voltage gain range by switching among these Three modes, which is attractive for energy storage system applications needing wide voltage variation. The proposed topology operates with constant switching frequency, which is easy to implement With digital control, and it can achieve soft switching for all the switches and diodes in the circuit as a conventional LLC resonant converter. The performance of the proposed converter is validated by the experimental results from a 1-kW prototype with 20 A maximum output current. In this paper, a new family of zero-voltage transition (ZVT) bidirectional converters are introduced. In the proposed converters, soft-switching condition for all semiconductor elements is provided regardless of the power flow direction and without any extra voltage and current stress on the main switches. The auxiliary circuit is composed of a coupled inductor with the converter main inductor and two auxiliary switches. The auxiliary switches benefit from significantly reduced voltage stress and without Requiring floating gate drive circuit. Also, by applying the synchronous rectification to the auxiliary switches Body diodes, conduction losses of the auxiliary circuit are reduced. In the auxiliary circuit, the leakage inductor is used as the resonant inductor and all the magnetic components are implemented on a single core which has resulted in significant reduction of the converter volume. In the proposed converters, the reverse recovery losses of the converter-rectifying diodes are completely eliminated and hence, using the low-speed body diode of the power switch as the converter-rectifying diode is feasible. The theoretical analysis for a bidirectional buck and boost converter is Presented in detail and the validity of the theoretical analysis is justified using the experimental results of a 250-W prototype converter. Electro active polymer (EAP) actuators have been investigated to convert electrical energy intomechanical deformation in autonomous microrobots. The use of dielectric EAP actuators

31 061 Bidirectional Single Power- Conversion DC-AC Converter with Non-Complementary Active-Clamp Circuits comes with several challenges to address requirements such as high excitation voltages, explicit driving signals, and low conversion efficiency. External bulky and heavy power sources are used to generate and provide required excitation voltages. The development Of a miniature, high voltage gain, and highly efficient power electronic interface is required to overcome such challenges and enable autonomous operation of miniature robots. In this paper, a bidirectional singlestage resonant dc dc step-up converter is introduced and developed to efficiently drive high-voltage EAP actuators in mobile microrobots. The converter utilizes resonant capacitors and a coupled inductor as a softswitched LC network to step up low input voltage. High-frequency soft-switching operation owing to LC resonance allows small footprint of the circuit without suffering from switching losses, which in turn increases the efficiency. The circuit is capable of generating explicit high-voltage actuation signals, with capability of recovering unused energy from EAP actuators. A 4-mm 8-mm, 100-mg, and 600- mw prototype has been designed and fabricated to drive an in-plane gap-closing electrostatic inchworm motor. Experimental validations have been carried out to verify the circuit s ability to step up voltage from 2 To 100 V and generate two 1-kHz, 100-V driving voltages at 2-nF capacitive loads. This paper presents a bidirectional single powerconversion dc-ac converter with non-complementary Active-clamp circuits. The proposed converter comprises a bidirectional flyback converter and an unfolding bridge. In order to interface the grid with a low voltage energy storage through only single powerconversion, the bidirectional flyback converter transforms the low voltage directly into the folded grid voltage and regulates the folded grid current. The proposed converter adopts noncomplementary operation strategy for the active-clamp circuits. By using this strategy, the bidrectional flyback converter not only avoids the voltage spike but also minimizes the power losses by the circulating energy. Thus, with single power-conversion and non-complementary active-clamp circuits, the proposed converter obtains high power efficiency. To facilitate the bidirectional single power-conversion, a novel control algorithm is developed. With this control algorithm, the proposed

32 062 High Step-Up/Step-Down Soft- Switching Bidirectional DC DC Converter With Coupled- Inductor and Voltage Matching Control for Energy Storage Systems 063 A BIDIRECTIONAL SINGLE- STAGE THREEPHASE RECTIFIER WITH HIGH- FREQUENCY ISOLATION AND POWER FACTOR CORRECTION 064 A High-Voltage SiC-Based Boost PFC for LED Applications converter ensures high grid power quality and seamless mode transition.the proposed bidirectional dc-ac converter is theoretically analyzed in detail. The experimental results based on a 250W prototype are provided to evaluate its performance A soft-switching bidirectional dc dc converter (BDC) with a coupled-inductor and a voltage doubler cell Is proposed for high step-up/step-down voltage conversion applications. A dual-active half-bridge (DAHB) converter is integrated into a conventional buck-boost BDC to extend the voltage gain dramatically and decrease switch voltage stresses effectively. The coupled inductor operates not only as a filter inductor of the buck-boost BDC, but also as a transformer of the DAHB converter. The input voltage of the DAHB converter is shared with the output of the buck-boost BDC. So, PWM control can be adopted to the buck-boost BDC to ensure that the voltage on the two sides of the DAHB converter is always matched. As a result, the circulating current and conduction losses can be lowered to improve efficiency. Phase-shift control is adopted to the DAHB converter to regulate the power flows of the proposed BDC. Moreover, zero-voltage switching (ZVS) is achieved for all the active switches to reduce the switching losses. The operational principles and characteristics of the proposed BDC are presented in detail. The analysis and performance have been fully validated experimentally on a V/400 V 1-kW hardware prototype. This paper proposes a single-stage three-phase rectifier with high-frequency isolation, power factor correction, and bidirectional power flow. The presented topology is adequate for dc grids (or smartgrids), telecommunications (telecom) power supplies, and more recent applications such as electric vehicles. The converter is based on the three-phase version of the dual active bridge (DAB) associated with the threestateswitching cell (3SSC), whose power flow between the primary and secondary sides is controlled by the phase-shift angle. A theoretical analysis is presented and validated through simulation and experimental. This paper reports a single-stage grid-supplied boost converter with power factor correction for lightemitting diode (LED)-applications using Silicon- Carbide (SiC) and operating at the boundary between

33 065 Bumpless Control for Reduced THD in Power Factor Correction Circuits 066 Control of a Single-Stage Three- Phase Boost Power Factor Correction Rectifier continuous and discontinuous conduction modes to reduce switching losses. The converter is supplied by a 230 VRMS grid voltage, and attains 1200-V dc at the output port, where a-spot of 320 LEDs connected in series is supplied at constant current. The slidingmode control theory is employed to analyze the switching regulator dynamics, assuring the system stability. The controller is easily implemented by means of a hysteretic comparator avoiding the risk of modulator saturation. The converter can operate in a normal mode, in which all the input current semicycles are employed, and in a burst mode where only a fraction of all the current semicycles is used. The power switch is realized with silicon carbide (SiC) devices to improve the performance of low-power -grid -supplied LED-based lighting systems. The experimental results are in perfect agreement with the theoretical predictions and demonstrate the feasibility of the proposed approach. It is well known that power factor correction (PFC) circuits suffer from two fundamentally different operating modes over a given AC input cycle. These two modes, continuous conduction mode (CCM) and discontinuous conduction mode (DCM), have very different frequency-response characteristics that can make control design for PFC circuits challenging. The problem is exacerbated by attempts to improve efficiency by dynamically adjusting the PWM switching frequency based on the load. Adjusting the PWM frequency based on the load limits controller bandwidth and restricts dynamic performance. Prior work has made use of multiple controllers, however, they have not addressed the discontinuity (bump) that exists when switching between controllers. In this paper, bumpless controllers will be synthesized for a 750 watt, semi-bridgeless PFC for the CCMDCM operating modes. Advances in power electronics are enabling More Electric Aircrafts (MEAs) to replace pneumatic systems with electrical systems. Active power factor correction (PFC) rectifiers are used in MEAs to rectify the output voltage of the three-phase AC-DC boost converter, while maintaining a unity input power factor. Many existing control strategies implement PI compensators, with slow response times, in their

34 067 Interleaved Digital Power Factor Correction Based on the Sliding- Mode Approach 068 LCL Filter Design for Threephase Two-level Power Factor Correction using Line Impedance Stabilization Network voltage and current loops. Alternatively, computationally expensive nonlinear controllers can be chosen to generate input currents with high power factor and low total harmonic distortion (THD), but they may need to be operated at high switching frequencies due to relatively slower execution of control loop. In this work, a novel control strategy is proposed for a three-phase, singlestage boost-type rectifier that is capable of tight and fast regulation of the output voltage, while simultaneously achieving unity input power factor, without constraining the operating switching frequency. The proposed control strategy is implemented, using one voltage-loop PI controller and a linearized transfer function of dutyratio to input current, for inner loop current control. A 1.5 kw three-phase boost PFC prototype is designed and developed to validate the proposed control algorithm. The experimental results show that an input power factor of and a tightly regulated DC link voltage with 3% ripple can be achieved. This study describes a digitally controlled power factor correction (PFC) system based on two interleaved boost converters operating with pulsewidth modulation (PWM). Both converters are independently controlled by an inner control loop Based on a discrete-time sliding-mode (SM) approach that imposes loss-free resistor (LFR) behavior on each cell. The switching surface implements an average current-mode controller so that the power factor (PF) is high. The SM-based digital controller is designed to operate at a constant switching frequency so that the interleaving technique, which is recommended for ac dc powerconversion systems higher than 1 kw, can be readily applied. Anouter loop regulates the output voltage by means of a discrete-time proportional integral (PI) compensator directly obtained from a discrete-time small-signal model of the ideal sliding dynamics. The control law proposed has been validated using numerical simulation and experimental results in a 2-kW prototype. This paper presents LCL filter design method for three-phase two-level power factor correction (PFC) using line impedance stabilization network (LISN). A straightforward LCL filter design along with variation in grid impedance is not simply achievable and inevitably lead to an iterative solution for filter.

35 069 New AC DC Power Factor Correction Architecture Suitable for High-Frequency Operation By introducing of fast power switches for PFC applications such as silicon-carbide, major current harmonics around the switching frequency drops in the region that LISN can actively provide well-defined impedance for measuring the harmonics (i.e. 9 khz- 30MHz). Therefore, LISN can be replaced with unknown grid impedance at high frequency, simplify the model of the filter, and provide repetitive measurements. In this paper, all the filter parameters are derived with analyzing the behavior of the converter at high frequency with presence of LISN impedance. The minimum required filter capacitor is derived using the current ripple behavior of converterside inductor. The grid-side inductor is achieved as a function of LISN impedance to fulfill the grid regulation. To verify the analyses, an LCL filter is designed for a 5 kw SiC-based PFC. The simulation and experimental results support the validity of the method. This paper presents a novel ac dc power factor correction (PFC) power conversion architecture for a singlephase grid interface. The proposed architecture has significant advantages for achieving high efficiency, good power factor, and converter miniaturization, especially in low-to-medium power applications. The architecture enables twice-linefrequency energy to be buffered at high voltage with a large voltage swing, enabling reduction in the energy buffer capacitor size and the elimination of electrolytic capacitors. While this architecture can be beneficial With a variety of converter topologies, it is especially suited for the system miniaturization by enabling designs that operate at high frequency (HF, 3 30 MHz). Moreover, we introduce circuit implementations that provide efficient operation in this range. The proposed approach is demonstrated for an LED driver converter operating at a (variable) HF switching frequency (3 10 MHz) from 120 Vac, and supplying a 35Vdc output at up to 30 W. The prototype converter achieves high efficiency (92%) and power factor (0.89), and maintains a good performance over a wide load range. Owing to the architecture and HF operation, the prototype achieves a high box power density of 50 W/in3 ( displacement power density of 130 W/in3 ), with miniaturized inductors, ceramic energy buffer

36 070 Bridgeless SEPIC PFC Converter for Low Total Harmonic Distortion and High Power Factor 071 Interleaved SEPIC Power Factor Pre-Regulator Using Coupled Inductors in Discontinuous Conduction Mode with Wide Output Voltage capacitors, and a small-volume EMI filter. There is a need to improve the power quality of the grid as well as the power factor implied on the grid due to the nonlinear loads connected to it. A new single phase bridgeless AC/DC power factor correction (PFC) topology to improve the power factor as well as the total harmonic distortion (THD) of the utility grid is proposed in this research. By eliminating the input bridge in conventional PFC converters, the control circuit is simplified; the total harmonics distortion THD and power factor PF are improved. The controller operates in multi loop fashion as the outer control loop calculates the reference current through innovative filtering and signal processing. Inner current loop generates PWM switching signals through the PI controller. Analytical derivation of the proposed converter is presented in detail. Performance of the proposed PFC topology is verified for prototype using PSIM circuit simulations. The experimental system is developed, and the experimental results agree with simulation results. A power factor pre-regulator (PFP) usually serves as the first stage of an active two-stage AC/DC converters in a variety of applications including inductive heating systems, wireless charging systems, and onboard chargers for plug-in electric vehicles (PEVs). Conventionally, boost-type PFPs are utilized to regulate the DC-link voltage at a fixed voltage; however, a variable DC-link voltage can enhance the overall efficiency of the converters. In this paper, an interleaved single-ended primary inductor converter (SEPIC) with coupled inductors is proposed as the PFP stage for two-stage AC/DC converters. The converter is designed to operate in discontinuous conduction mode (DCM) in order to achieve soft switching for switches and diodes. The directly coupled inductors are utilized to reduce the number of magnetic components and decrease the input current ripple. A 500W interleaved SEPIC PFP prototype is designed to verify the benefits of this converter. The experimental results show that the converter can maintain high efficiency over a wide range of DC-link voltage.

37 072 Reduced Current Stress Bridgeless Cuk PFC Converter with New Voltage Multiplier Circuit 073 Single-Stage Bridgeless AC-DC PFC Converter Using a Lossless Passive Snubber and Valley- Switching 074 A Coupled Inductor Based High Boost Inverter with Sub Unity In this paper, a bridgeless Cuk derived AC/DC converter is proposed. The present circuit topology separates the input PFC current and output voltageregulation current, which reduces the switch current stresses and improves system thermal management compared to the conventional bridge and bridgeless Cuk topologies. In addition, the proposed bridgeless topology has semi-soft switching function of all active switches to reduce converter switching losses. Therefore, the switch conduction losses and switching power losses all can be decreased due to the reduced current stress and semi-soft switching function. To understand the proposed Cuk derived converter, the circuit operation is explained and the steady-state behavior is analyzed. Finally a prototype system with DSP TMS320F28335 controller is implemented. Some simulation and experimental results are offered to verify the validity of the proposed bridgeless Cuk derived PFC converter. A single-stag converter using a losslee ss bripdagsesleivses sancub-dbcer PaFnCd valley-switching is proposed. The proposed converter is Ibna stehde opnr oap towsoe-ds tacgoen vberridtegre, letshse bcooonsdt-ufclytbioanc kl ocsosnevse rtaerre. reduced by removing an input fullbridge diode rectifier. The boost inductor is designed to be operated in the discontinuous- conduction mode for achieving high power factor. In the flyback module, the couple inductor that provides inputoutput electrical isolation for safety is designed to be operated in the critical- conduction mode for low RMS current and low turn-on switching loss by using valleyswitching operation. Because of the lossless tshneu blbeaekr acgirec uiint,d tuhcet voor lteangeer sgpyi kies orf escwyictclehd i.s Tclhaem psendu,b abnedr capacitor is used as a DC-bus capacitor, which is divided idnitroe cttlwy oc ocnadpuacctietdo rtso. tihne oadudtpituiot,n a, nsdo tmhee reinmpauitn inpgo wpeorw eisr is stored in DC-bus capacitor. So, low voltage rating capacitors can be used as the DC-bus capacitor and power tarnaanlsyfseirs eifsfi civeenrcifyie ids iomnp raonv edo.u ttphuet p4r8e se[vn]t eda ntdh eo6r0e ti[cwa]l experimental prototype. Voltage source inverter (VSI) cannot provide an output voltage higher than its input and needs dead

38 Turns Ratio Range 075 A High Power Density Single- Phase Inverter Using Stacked Switched Capacitor Energy Buffer 076 A ZVS Grid-Connected Full- Bridge Inverter With a Novel ZVS SPWM Scheme time scheme for its switches to prevent DC link short circuit due to spurious turn-on of switches by electro magnetic interference (EMI). Impedance source inverters have eliminated these disadvantages by providing boost functionality with improved EMI immunity. Coupled inductor based impedance source inverters provided increased gain at the expense of increased coupled inductor turns ratio. In this paper, a coupled inductor based high gain inverter is proposed which achieves higher gain by increasing the coupled inductor turns ratio (n=n2/n1) within a very narrow turns ratio range of 0 n < 1 which is a major improvement over the other coupled inductor based high boost impedance source inverters. The proposed inverter, named Improved Trans Current Fed Switched Inverter, is described along with its equivalent operating states and relation between its input and output variables are derived. The steady state inverter waveforms are shown using PSpice simulations. The operation of the inverter is validated by the experimental results which show strong correlation with the theoretical analysis. A 110 V RMS AC output is obtained from 26 V DC input using a coupled inductor with turns ratio of 0.33 to demonstrate its high boost operation This paper presents a high power density 2 kw singlephase inverter, with greater than 50 W/in3 power density and 90% line-cycle average efficiency. This performance is achieved through innovations in twiceline-frequency (120 Hz) energy buffering and high frequency dc-ac power conversion. The energy buffering function is performed using an advanced implementation of the recently proposed stacked switched capacitor (SSC) energy buffer architecture, and the dc-ac power conversion is performed using a soft-switching SiC-FET based converter, with a digital implementation of variable frequency constant peak current control. A zero-voltage switching (ZVS) grid-connected fullbridge inverter and its modulation schemes are investigated. A novel sinusoidal pulse width

39 077 Dual Buck Inverter with Series Connected Diodes and Single Inductor 078 Three-Phase Split-Source Inverter (SSI): Analysis and Modulation modulation scheme for the ZVS fullbridge inverter (ZVS SPWM) is proposed in this paper. The ZVS SPWM is evolved from the double-frequency SPWM by adding gate drive to the auxiliary switch. The ZVS condition is analyzed and the circulation loss of the resonant branch is optimized by adjusting the energy storage in the resonant inductor. The reverse recovery of the body-diode of MOSFET is relieved and ZVS is realized for both main and auxiliary switches. The filter inductors are significantly reduced with higher switching frequency. The design guideline of resonant parameters and the implementation of ZVS SPWM in DSP controller are introduced. The ZVS SPWM scheme is verified on a 3-kW inverter prototype. According to the experimental result, peak efficiency as 98.8% is achieved. In a DC-AC system, some problems may threaten the reliability of the whole system, such as the shoot through issue and the failure of reverse recovery. Some methods are proposed to improve the reliability of the converters. The dual buck inverters can solve the above problems without adding dead time but the dual buck topology has a main drawback of low magnetic utilization which increases the volume and weight of the system. This paper firstly summarizes the traditional dual buck topologies including a kind of single inductor dual buck inverter which can make full use of the inductance. Then a method to improve the reliability of the MOSFET inverter is proposed. A kind of novel dual buck inverter with series connected diodes and single inductor is introduced. The novel inverter retains the dual buck topologies advantage of high reliability and can make full use of the inductance. Also, compared to the traditional single inductor dual buck topology, the controlling strategy of the proposed inverter is simpler. Finally, the simulation and experimental results verified the theoretical analysis. In several electrical dc ac power conversions, the ac output voltage is higher than the input voltage. If a voltage-source inverter (VSI) is used, then an additional dc dc boosting stage is required to overcome the step-down VSI limitations. Recently, several impedance source converters are gaining higher attentions [1], [2], as they are able to provide buck-boost capability in a single conversion stage. This

40 079 A Pulsewidth Modulation Technique for High-Voltage Gain Operation of Three-Phase Z-Source Inverters 080 Switched-Coupled-Inductor Quasi-Z-Source Inverter paper proposes the merging of the boost stage and the VSI stage in a single stage dc ac power conversion, denoted as split-source inverter (SSI). The proposed topology requires the same number of active switches of the VSI, three additional diodes, and the same eight states of a conventional spacevector modulation. It also shows some merits compared to Z-source inverters, especially in terms of reduced switch voltage stress for voltage gains higher than This paper presents the analysis of the SSI and compares different modulation schemes. Moreover, it presents a modified modulation scheme to eliminate the low frequency ripple in the input current and the voltage across the inverter bridge. The proposed analysis has been verified by simulation and experimental results on a 2.0-kW prototype. Z-source inverter (ZSI) was recently proposed as a single-stage buck boost dc ac power conversion topology. It augments voltage boost capability to the typical voltage buck operation of the conventional voltage source inverter with enhanced reliability. However, its boosting capability could be limited; therefore, it may not suit applications requiring a highvoltage boosting gain. To enhance the boosting capability, this paper proposes a new pulsewidth modulation (PWM) technique to control the generation of the shoot-through intervals in threephase ZSIs. The proposed modulation technique achieves a reliable high-voltage gain operation without adding any extra hardware to the ZSI structure, which preserves its single-stage buck boost conversion nature. In this paper, the principle of the proposed modulation technique is analyzed in detail, and the comparison of the ZSI performance under the conventional and the proposed PWM techniques is given. The simulation and experimental results are shown to verify the analysis of the proposed concept. Z-source inverters have become a research hotspot because of their single-stage buck boost inversion ability, and better immunity to EMI noises. However, their boost gains are limited, because of higher component-voltage stresses and poor output power quality, which results from the tradeoff between the shoot-through interval and the modulation index. To overcome these drawbacks, a new high-voltage boost impedance-source inverter called a switched-coupled-

41 081 Bidirectional Single Power- Conversion DC-AC Converter with Non-Complementary Active-Clamp Circuits 082 High-Efficiency Bidirectional DAB Inverter Using a Novel inductor quasi-z-source inverter (SCL-qZSI) is proposed,which integrates a switched-capacitor and a three-winding switched-coupled inductor (SCL) into a conventional qzsi. The proposed SCL-qZSI adds only one capacitor and two diodes to a classical qzsi, and evenwith a turns ratio of 1, it has a stronger voltage boost-inversion ability than existing highvoltage boost (q)zsi topologies. Therefore, compared with other (q)zsis for the same input and output voltages, the proposed SCL-qZSI utilizes higher modulation index with lower component-voltage stresses, has better spectral performance, and has a lower input inductor current ripple and flux density swing or, alternately, it can reduce the number of turns or size of the input inductor. The size of the coupled inductor and the total number of turns required for three windings are comparable to those of a single inductor in (q)zsis. To validate its advantages, analytical, simulation, and experimental results are also presented. This paper presents a bidirectional single powerconversion dc-ac converter with non-complementary active-clamp circuits. The proposed converter comprises a bidirectional flyback converter and an unfolding bridge. In order to interface the grid with a low voltage energy storage through only single powerconversion, the bidirectional flyback converter ransforms the low voltage directly into the folded grid voltage and regulates the folded grid current. The proposed converter adopts noncomplementary operation strategy for the active-clamp circuits. By using this strategy, the bidirectional flyback converter not only avoids the voltage spike but also minimizes the power losses by the circulating energy. Thus, with single power-conversion and non-complementary active-clamp circuits, the proposed converter obtains high power efficiency. To facilitate the bidirectional single power-conversion, a novel control algorithm is developed. With this control algorithm, the proposed converter ensures high grid power quality and seamless mode transition. The proposed bidirectional dc-ac converter is theoretically analyzed in detail. The experimental results based on a 250W prototype are provided to evaluate its performance. This paper proposes a high-efficiency bidirectional dual-active-bridge (DAB) inverter using a novel

42 Hybrid Modulation for Stand- Alone Power Generating System With Low Input Voltage 083 Analysis and Design of Modified Half-Bridge Series-Resonant Inverter With DC-Link Neutral- Point-Clamped Cell 084 Hybrid Modulation Scheme for a High-Frequency AC-Link Inverter hybridmodulation for a stand-alone power generating system with a lowinput voltage. The proposed DAB inverter consists of a DAB dc dc converter and a synchronous rectifier (SR) for unfolding. The DAB dc dc converter transforms the low dc voltage into a rectified sine wave that pulsates twice the grid frequency. The rectified sine wave unfolds into the grid voltage by SR. The proposed hybrid modulation combines a phase shift control and a variable frequency control. The variable frequency control converts the nonlinear function of the phase shift angle into a linear function and controls the output power. This leads to a simple closed-loop control for the sinusoidal current waveform, a low harmonic distortion, and a high-voltage conversion ratio without an increase of the transformer turn ratio. Since the proposed DAB inverter has only a single power conversion stage, it has a simple structure, high power density, and low cost. It also has a high efficiency of 94.2% by a zero-voltage switching (ZVS) turn on of the switches in two full bridges (FBs). The operation principle of the proposed DAB inverter using this hybrid modulation is analyzed and verified. Experimental results for a 1-kW prototype are obtained to show the performance. In this paper, a modified half-bridge (HB) resonant inverter topology with a dc-link neutral-point-clamped cell is proposed. A pseudo asymmetrical voltagecancellation PWM method and a control strategy are introduced. The proposed topology can maximize the inverter output power factor, and minimize variations in the switching frequency. In addition, most switches are clamped to half of the dc input voltage at turn-off, increasing the overall efficiency of the system for a wide load range. The efficiency of the proposed inverter is improved up to 7%at light-load conditions compared with that of the conventional HB inverter. Informative expressions for performance comparison between the proposed inverter and its counterpart are provided. In addition, the losses in the inverter primary components are analytically analyzed in detail. For validation, a 120-W prototype is implemented,and experimental results are presented This paper describes a hybrid modulation scheme for a high-frequency ac-link (HFACL) multistage inverter comprising a front-end dc/ac converter, followed by

43 085 A Family of Five-Level Dual- Buck Full-Bridge Inverters for Grid-Tied Applications isolation transformers, an ac/pulsating-dc converter, and a pulsating-dc/ac converter. The hybrid modulation scheme enables 1) removal of the dc-link filter evident in conventional fixed dc-link (FDCL) inverters placed after the ac/pulsating-dc converter stage and before an end stage voltage source inverter and 2) significant reduction in switching loss of the inverter by reducing the high-frequency switching requirement of the pulsating-dc/ac converter by twothird yielding higher efficiency, improved voltage utilization, and reduced current stress. Unlike the FDCL approach, in the HFACL approach, hybrid modulation enables the retention of the sine-wavemodulated switching information at the output of the ac/pulsating-dc converter rather than filtering it to yield a fixed dc thereby reducing the high-frequency switching requirement for the pulsating-dc/ac converter. Overall, the following is outlined: 1) hybrid modulation scheme and its uniqueness, 2) operation of the HFACL inverter using the hybrid modulation scheme, 3) comparison of the efficiency and losses, current stress, and harmonic distortion between the hybrid-modulation-basedhfacl inverter and the FDCL inverter, and 4) scaled experimental validation. It is noted that the term hybrid modulation has no similarity with themodulation scheme for a hybrid converter (which are conjugation of two types of converters based on a slowand fast device) reported in the literature. The term hybrid modulation scheme is simply chosen because at any giventime only one leg of the inverter output stage (i.e., pulsating-dc/ac converter) switch under high frequency, while the other two legs do not switch. The outlined hybrid modulation scheme is unlike all reported discontinuous modulation schemes where the input is a dc and not a pulsating modulated dc, and at most only one leg stays on or off permanently in a 60 or 120 cycle. Dual-buck inverters feature some attractive merits, such as no reverse recovery issues of the body diodes and free of shoot-through. However, since the filter inductors of dual-buck inverters operate at each half cycle of the utility grid alternately, the inductor capacity of dual-buck inverters is twice as much as H-bridge inverters. Thus, the power density of dualbuck converters needs to be improved, as well as the

44 086 A New Cascaded Switched- Capacitor Multilevel Inverter Based on Improved Series Parallel Conversion With Less Number of Components conversion efficiency. In this paper, the detailed derivation process of two five-level full-bridge topology generation rules are presented and explained. One is the combination of a conventional three-level full-bridge inverter, a two-level capacitive voltage divider, and a neutral point clamped branch. The other method is to combine a three-level half-bridge inverter and a two-level half-bridge inverter. Furthermore, in order to enhance the reliability of existing five-level DBFBI topologies, an extended five-level DBFBI topology generation method is proposed. The two-level half-bridge inverter is replaced by a two-leveldual-buck half-bridge inverter; thus, a family of five-level DBFBI topologies with high reliability is proposed. The operation modes, modulation methods, and control strategies of the series-switch five-level DBFBI topology are analyzed in detail. The power device losses of the three-level DBFBI topology and five-level DBFBI topologies, with different switching frequencies, are calculated and compared. Both the relationship between the neutral point potential self-balancing and the modulation index of inverters are revealed. A universal prototype was built up for the experimental tests of the three-level DBFBI topology, the five-level H-bridge inverter topology, and the existing three five-level DBFBI topologies. Experimental results have shown that the five-level DBFBI topologies exhibit higher efficiency than the five-level H-bridge inverter topology and the threelevel DBFBI topology. As well, the higher power density has been achieved by the five-level DBFBI topologies compared with the three-level DBFBI topology. The aim of this paper is to present a new structure for switched-capacitor multilevel inverters (SCMLIs) which can generate a great number of voltage levels with optimum number of components for both symmetric and asymmetric values of dcvoltage sources. The proposed topology consists of a new switched-capacitor dc/dc converter (SCC) that has boost ability and can charge capacitors as selfbalancing by using the proposed binary asymmetrical algorithm and series parallel conversion of power supply. The proposed SCC unit is used in new configuration as a submultilevel inverter (SMLI) and

45 087 A Single DC Source Cascaded Seven-Level Inverter Integrating Switched Capacitor Techniques 088 A Three Phase Hybrid Cascaded Modular Multilevel Inverter for Renewable Energy Environment then, these proposed SMLIs are cascaded together and create a new cascaded multilevel inverter (MLI) topology that is able to increase the number of output voltage levels remarkably without using any full H- bridge cell and also can pass the reverse current for inductive loads. In this case, two half-bridge modules besides two additional switches are employed in each of SMLI units instead of using a full H-bridge cell that contribute to reduce the number of involve components in the current path, value of blocked voltage, the variety of isolated dc-voltage sources, and as a result, the overall cost by less number of switches in comparison with other presented topologies. The validity of the proposed SCMLI has been carried out by several simulation and experimental results. In this paper, a novel cascaded seven-level inverter topology with a single input source integrating switched capacitor techniques is presented. Compared with the traditional cascade multilevel inverter (CMI), the proposed topology replaces all the separate dc sources with capacitors, leaving only one H-bridge cell with a real dc voltage source and only adds two charging switches. The capacitor charging circuit contains only power switches, so that the capacitor charging time is independent of the load. The capacitor voltage can be controlled at a desired level without complex voltage control algorithm and only use the most common carrier phase-shifted sinusoidal pulse width modulation (CPS-SPWM) strategy. The operation principle and the charging-discharging characteristic analysis are discussed in detail. A 1kW experimental prototype is built and tested to verify the feasibility and effectiveness of the proposed topology. This paper presents a three phase hybrid cascaded modular multilevel inverter topology which is derived from a proposed modified H-bridge (MHB) module. This topology results in the reduction of number of power switches, losses, installation area, voltage stress and converter cost. For renewable energy environment such as Photovoltaic (PV) connected to the micro-grid system, it enables the tranformerless operation and enhances the power quality. This multilevel inverter is an effective and efficient power electronic interface

46 089 An Enhanced Single Phase Step- Up Five-Level Inverter 090 Novel Three Phase Multi-Level Inverter Topology with Symmetrical DC-Voltage Sources strategy for renewable energy systems. The basic operation of single module and the proposed cascaded hybrid topology is explained. The ability to operate in both symmetrical and asymmetrical modes is analyzed. The comparative analysis is done with classical cascaded H-bridge (CHB) and flying capacitor (FC) multilevel inverters. The Nearest Level Control (NLC) method is employed to generate the gating signals for the power semiconductor switches. To verify the applicability and performance of the proposed structure in PV renewable energy environment, simulation results are carried out by MATLAB/SIMULINK under both steady state and dynamic conditions. Experimental results are presented to validate the simulation results. In this letter, an enhanced step-up five-level inverter is proposed for photovoltaic (PV) systems. Compared with conventional five-level inverters, the proposed topology can realize the multilevel inversion with high step-up output voltage, simple structure and reduced number of power switches. The operating principle of the proposed inverter has been analyzed and the output voltage expression has been derived. In addition, the comparison with existing topologies of single phase five-level inverters is presented. Finally, experimental results validate the performance of the proposed topology. In this paper, a novel three phase modular multilevel inverter (MMLI) is proposed. The proposed inverter consists of primary cell and repetitive modular cells which are connected in series arrangement with the primary cell. Therefore, the proposed topology is able to get more output voltages levels number by adding extra modular cells. Both the sinusoidal pulse width modulation (SPWM) and staircases modulation are effectively executed. The proposed inverter is distinguished by several advantages such as: reduction in the number of semiconductor power switches, reduced Dc-voltage sources count, high utilization factor of the used Dc-voltagem sources, and the control execution simplicity. Accordingly, them installation cost and size are reduced. It is simulated using MATLAB software package-tool. In addition, a

47 091 Design and Implementation of a Novel Multilevel DC AC Inverter 092 A Novel Nine-Level Inverter Employing One Voltage Source and Reduced Components as High Frequency AC Power Source prototype is developed and examined, to verify both control techniques and performance of the topology. Moreover, experimental results are provided to authenticate the simulation results and it show high similarity with it. In this paper, a novel multilevel dc ac inverter is proposed. The proposed multilevel inverter generates seven-level ac output voltage with the appropriate gate signals design. Also, the low-pass filter is used to reduce the total harmonic distortion of the sinusoidal output voltage. The switching losses and the voltage stress of power devices can be reduced in the proposed multilevel inverter. The operating principles of the proposed inverter and the voltage balancing method of input capacitors are discussed. Finally, a laboratory prototype multilevel inverter with 400-V input voltage and output 220 Vrms/2 kw is implemented. The multilevel inverter is controlled with sinusoidal pulsewidth modulation (SPWM) by TMS320LF2407 digital signal processor (DSP). Experimental results show that the maximum efficiency is 96.9% and the full load efficiency is 94.6%. Increasing demands for power supplies have contributed to the population of high frequency ac (HFAC) power distribution system (PDS), and in order to increase the power capacity, multilevel inverters (MLIs) frequently serving as the high-frequency (HF) source-stage have obtained a prominent development. Existing MLIs commonly use more than one voltage source or a great number of power devices to enlarge the level numbers, and HF modulation (HFM) methods are usually adopted to decrease the total harmonic distortion (THD). All of these have increased the complexity and decreased the efficiency for the conversion from dc to HF ac. In this paper, a nine-level inverter employing only one input source and fewer components is proposed for HFAC PDS. It makes full use of the conversion of series and parallel connections of one voltage source and two capacitors to realize nine output levels, thus lower THD can be obtained without HFM methods. The voltage stress on power devices is relatively relieved, which has broadened its range of applications as well. Moreover, proposed nine-level inverter is equipped with the inherent self-voltage balancing ability, thus

48 093 A Performance Investigation of a Four-Switch Three-Phase Inverter-Fed IM Drives at Low Speeds Using Fuzzy Logic and PI Controllers 094 A Systematic Power-Quality Assessment and Harmonic Filter Design Methodology for Variable-Frequency Drive Application in Marine Vessels the modulation algorithm gets simplified. The circuit structure, modulation method, capacitor calculation, loss analysis and performance comparisons are presented in this paper, and all the superior performances of proposed nine-level inverter are verified by simulation and experimental prototypes with rated output power of 200W. The accordance of theoretical analysis, simulation and experimental results confirms the feasibility of proposed nine-level inverter. This paper presents a speed controller using a fuzzylogic controller (FLC) for indirect field oriented control (IFOC) of induction motor (IM) drives fed by a four-switch three-phase (FSTP) inverter. In the proposed approach, the IM drive system is fed by FSTP inverter instead of the traditional six-switch three-phase (SSTP) inverter for a cost-effective low power applications. The proposed FLC improves dynamic responses and, it is also designed with reduced computation burden. The complete IFOC scheme incorporating the FLC for IM drives fed by the proposed FSTP inverter is built in Matlab/Simulink and, it is also experimentally implemented in real-time using a DSP-DS1103 control board for a prototype 1.1 kw IM. The dynamic performance, robustness, and insensitivity of the proposed FLC with FSTP inverter fed IM drive is examined and compared to a traditional PI controller under speed tracking, load disturbances, and parameters variation, particularly at low speeds. It is found that the proposed FLC is more robust than the PI controller under load disturbances, and parameters variation. Moreover, the proposed FSTP IM drive is comparable with a traditional SSTP IM drive, considering its good dynamic performance, cost reduction and low THD. Inmaritime industry, high fuel costs encourage use of variable-frequency drives (VFDs) for energy-saving applications. However, introduction of such nonlinear loads in the vessel s power distribution network induces harmonics, which can lead to potential risks if are not predicted and controlled. In this paper, a systematic power-quality assessment and monitoring

49 095 BLDC Motor Driven Solar PV Array Fed Water Pumping System Employing Zeta Converter methodology is proposed to calculate VFD contribution to voltage distortion at the point of common coupling (PCC), considering the source short-circuit capacity and the existing vessel s power system harmonics. According to voltage harmonic distortion limits set by marine classification societies, design and sizing of appropriate harmonic attenuation filters is made, including ac and dc chokes and frequency-tuned passive filter options. The effectiveness of the proposed power-quality analyzing procedure is evaluated through a real practical example, which includes harmonic filter design for VFD retrofit application to fan and pump motors that operate constantly during sea-going operation in a typical tanker vessel. Power-quality field measurements obtained through a harmonic monitoring platform implemented on board verify that total voltage harmonic distortion and individual voltage harmonics at PCC are maintained below 5% and 3%, respectively, showing that design complies with relevant marine harmonic standards even in the worst operating case. This paper proposes a solar photovoltaic (SPV) array fed water pumping system utilizing a zeta converter as an intermediate DC-DC converter in order to extract the maximum available power from the SPV array. Controlling the zeta converter in an intelligent manner through the incremental conductance maximum power point tracking (INC- MPPT) algorithm offers the soft starting of the brushless DC (BLDC) motor employed to drive a centrifugal water pump coupled to its shaft. Soft starting i.e. the reduced current starting inhibits the harmful effect of the high starting current on the windings of the BLDC motor. A fundamental frequency switching of the voltage source inverter (VSI) is accomplished by the electronic commutation of the BLDC motor, thereby avoiding the VSI losses occurred owing to the high frequency switching. A new design approach for the low valued DC link capacitor of VSI is proposed. The proposed water pumping system is designed and modeled such that the performance is not affected even under the dynamic conditions. Suitability of the proposed system under dynamic conditions is demonstrated by the simulation results using MATLAB/Simulink software.

50 096 Commutation Torque Ripple Reduction Strategy of Z-Source Inverter Fed Brushless DC Motor 097 Position Sensorless Control Without Phase Shifter for High- Speed BLDC Motors With Low Inductance and Nonideal Back EMF Based on the Z-source inverter, this paper proposes a novel commutation torque ripple reduction strategy for brushless DC motor (BLDCM). The proposed strategy employs the same modulation mode in both the normal conduction period and the commutation period, and the commutation torque ripple is reduced by regulating the shoot-through vector and active vector duty cycles. The proposed detection method acquires the end point of commutation by comparing the clamped terminal voltages with reference zero level, and the signal-noise-ratio of the detection is improved by avoiding the attenuation of the terminal voltages. Furthermore, a certain pulse width of the shoot-through vector can not only reduce the commutation torque ripple but also provide a new opportunity to detect the end point of commutation. Moreover, Z-source inverter provides the buck boost ability for BLDCM drive system, then the dc voltage utilization can be improved, and the safety of the drive system can also be improved. In addition, this paper analyzes the terminal voltages during each vector. The experimental results verify the correctness of the theories and the effectiveness of the proposed approach. This paper presents a novel method for position sensorless control of high-speed brushless DC motors with low inductance and nonideal back electromotive force (EMF) in order to improve the reliability of the motor system of a magnetically suspended control moment gyro for space application. The commutation angle error of the traditional line-to-line voltage zerocrossing points detection method is analyzed. Based on the characteristics measurement of the nonideal back EMF, a two-stage commutation error compensationmethod is proposed to achieve the highreliable and high-accurate commutation in the operating speed region of the proposed sensorless control process. The commutation angle error is compensated by the transformative line voltages, the hysteresis comparators, and the appropriate design of the low-pass filters in the low-speed and high-speed region, respectively. Highprecision commutations are achieved especially in the high-speed region to decrease the motor loss in steady state. The simulated and experimental results showthat the proposed method can achieve an effective compensation effect in

51 098 Single-Phase Grid Connected Motor Drive System with DClink Shunt Compensator and Small DC-link Capacitor 099 Single-Phase Input Variable- Speed AC Motor System Based on an Electrolytic Capacitor-Less Single-Stage Boost Three-Phase Inverter 100 Switching-Gain Adaptation Current Control for Brushless DC Motors the whole operating speed region. The single-phase diode rectifier system with small DC-link capacitor shows wide diode conduction time and it improves the grid current harmonics. By shaping the output power, the system meets the grid current harmonics regulation without any power factor corrector or grid filter inductor. However, the system has torque ripple and suffers efficiency degradation due to the insufficient DC-link voltage. To solve this problem, this paper proposes the DC-link shunt compensator (DSC) for small DC-link capacitor systems. DSC is located on DC-node parallel and operates as the voltage source, improving the system performances. This circuit helps the grid currentshaping control during grid-connection time, and reduces the flux-weakening current by supplying the energy to the motor during grid-disconnection time. This paper presents a power control method and the design guideline of DSC. The feasibility of DSC is verified by simulation and experimental results. This paper presents a single-phase to three-phase adjustable-speed drive (ASD) system, which consists of a diode rectifier and a single-stage boost inverter without electrolytic capacitors (E-caps). The system has no shoot-through issues and gains high reliability due to the shoot-through zero-state regulation method. By using electrolytic capacitors-less topology, the lifetime can be greatly increased. By properly designing the tapping position of the inductor, the system has a high boost-inversion gain and can ride through grid voltage sags. By using the proposed harmonic injection method, the system can realize high input power factor and small dc-link ripple voltage, simultaneously. Experimental results of the electrolytic capacitors-less single-stage boost inverter (E-caps-less SSBI) based single-phase to three-phase ASD system are obtained to verify the actual performances. In this paper, a current control scheme with switching-gain adaptation is proposed for brushless DC motors. The scheme includes two components, namely a continuous control component and a switching control component. The continuous control component is employed with model reference adaptive control (MRAC) to approximate the parametric

52 uncertainties, and the switching control component is used with integral sliding-mode control (ISMC) to eliminate the general disturbance caused by both the approximation errors and the unstructured uncertainties. Due to the variation in general disturbance in different operating conditions, a switching-gain adaptation method based on the unknown disturbance estimation isproposed, which improves the transient performance of the current controller and eliminates the high-frequency noise of current caused by chattering. Finally, the effectiveness of the proposed method is verified by experimental results.

53 IEEE PROJECTS CODE. NO PROJECT TITLES YEAR 1.POWER SYSTEMS POWER QUALITY IMPROVEMENT, REACTIVE & HARMONIC COMPENSATION 001 New Control of PV Solar Farm as STATCOM (PV-STATCOM) for Increasing Grid Power Transmission Limits During Night and Day 002 An Adaptive Power Oscillation Damping Controller by STATCOM With Energy Storage 003 A New Control Strategy for Distributed Static Compensators Considering Transmission Reactive Flow Constraints 004 A Voltage-Controlled DSTATCOM for Power-Quality Improvement An Improved Hybrid DSTATCOM Topology to Compensate Reactive and Nonlinear Loads 006 The Transformerless Single-Phase Universal Active Power Filter for Harmonic and Reactive Power Compensation 007 An Enhanced Voltage Sag Compensation Scheme for Dynamic Voltage Restorer 008 An Improved iupqc Controller to Provide Additional Grid-Voltage Regulation as a STATCOM 009 A Grid-Connected Dual Voltage Source Inverter With Power Quality Improvement Features 010 Transformerless Hybrid Power Filter Based on a Six Switch Two-Leg Inverter for Improved Harmonic Compensation Performance 011 A New Railway Power Flow Control System Coupled With Asymmetric Double LC Branches 012 Analysis of DC Link Operation Voltage of a Hybrid Railway Power Quality Conditioner and its PQ Compensation Capability in High Speed Co-phase Traction Power Supply 013 A Systematic Approach to Hybrid Railway Power Conditioner Design With Harmonic Compensation for High-Speed Railway

54 2.RENEWABLE ENERGY A) WIND ENERGY APPLICATION 014 High-Gain Resonant Switched-Capacitor Cell-Based DC/DC Converter for Offshore Wind Energy Systems 015 DC Microgrid for Wind and Solar Power Integration 2014 B) SOLAR ENERGY APPLICATION 016 A Novel High Step-up DC/DC Converter Based on Integrating Coupled Inductor and Switched-Capacitor Techniques for Renewable Energy Applications 017 Hybrid Transformer ZVS/ZCS DC DC Converter With Optimized Magnetics and Improved Power Devices Utilization for Photovoltaic Module Applications 018 Performance of Medium-Voltage DC-Bus PV System Architecture Utilizing High-Gain DC DC Converter 019 A Single Stage CCM Zeta Microinverter for Solar Photovoltaic AC Module 020 Topology Review and Derivation Methodology of Single-Phase Transformerless Photovoltaic Inverters for Leakage Current Suppression 021 A High Efficiency Flyback Micro-inverter With a New Adaptive Snubber for Photovoltaic Applications 022 High Step-Up Converter With Three-Winding Coupled Inductor for Fuel Cell Energy Source Applications 023 Optimized Operation of Current-Fed Dual Active Bridge DC-DC Converter for PV Applications 024 Online Variable Topology-Type Photovoltaic Grid-Connected Inverter 3.GRID CONNECTED SYSTEMS 025 An Enhanced Islanding Microgrid Reactive Power, Imbalance Power, and Harmonic Power Sharing Scheme 026 A Novel Integrated Power Quality Controller for Microgrid 027 Power Control in AC Isolated Microgrids With Renewable Energy Sources and Energy Storage Systems 4.VEHICULAR APPLICATIONS

55 028 General Analysis and Design Guideline for a Battery Buffer System With DC/DC Converter and EDLC for Electric Vehicles and its Influence on Efficiency 029 Dual Active Bridge-Based Battery Charger for Plug-in Hybrid Electric Vehicle with Charging Current Containing Low Frequency Ripple 030 Reduced-Capacity Smart Charger for Electric Vehicles on Single-Phase Three-Wire Distribution Feeders With Reactive Power Control 031 A Non isolated Multi input Multi output DC DC Boost Converter for Electric Vehicle Applications 032 New Interleaved Current-Fed Resonant Converter With Significantly Reduced High Current Side Output Filter for EV and HEV Applications 5.AC AND DC DRIVES 033 PFC Cuk Converter-Fed BLDC Motor Drive 034 Variable-Form Carrier-Based PWM for Boost-Voltage Motor Driver With a Charge-Pump Circuit 035 Sensorless Drive for High-Speed Brushless DC Motor Based on the Virtual Neutral Voltage 036 Independent Control of Two Permanent-Magnet Synchronous Motors Fed by a Four-Leg Inverter 037 Online Inverter Fault Diagnosis of Buck-Converter BLDC Motor Combinations 038 A Unity Power Factor Bridgeless Isolated Cuk Converter-Fed Brushless DC Motor Drive 6.BIDIRECTIONAL CONVERTER 039 A Zero-Voltage-Transition Bidirectional DC/DC Converter 040 Steady-State Analysis of a ZVS Bidirectional Isolated Three Phase DC- DC Converter Using Dual Phase-Shift Control with Variable Duty Cycle 041 Novel High-Conversion-Ratio High-Efficiency Isolated Bidirectional DC DC Converter 042 DC DC Converter for Dual-Voltage Automotive Systems Based on Bidirectional Hybrid Switched-Capacitor Architectures 043 A Novel PWM High Voltage Conversion Ratio Bi-Directional Three- Phase DC/DC Converter with Y-Δ Connected Transformer 044 Performance Analysis of Bi-directional DC-DC Converters for Electric Vehicles 7.LED LIGHTING APPLICATIONS

56 045 Offline Soft-Switched LED Driver Based on an Integrated Bridgeless Boost Asymmetrical Half-Bridge Converter 046 A Novel Control Scheme of Quasi-Resonant Valley-Switching for High- Power-Factor AC-to-DC LED Drivers 047 A Novel Wall-Switched Step-Dimming Concept in LED Lighting Systems using PFC Zeta Converter 048 Analysis and Design of Single-Switch Forward-Flyback Two-Channel LED Driver with Resonant-Blocking Capacitor 8.POWER FACTOR CORRECTION CONVERTER 049 Bridgeless PFC-Modified SEPIC Rectifier With Extended Gain for Universal Input Voltage Applications 050 A Three-Level Quasi-Two-Stage Single-Phase PFC Converter with Flexible Output Voltage and Improved Conversion Efficiency 051 Front-End Converter With Integrated PFC and DC DC Functions for a Fuel Cell UPS With DSP-Based Control 052 Loss-Free Resistor-Based Power Factor Correction Using a Semi- Bridgeless Boost Rectifier in Sliding-Mode Control 053 Power Factor Corrected Zeta Converter Based Improved Power Quality Switched Mode Power Supply 054 A New Interleaved Three-Phase Single-Stage PFC AC DC Converter With Flying Capacitor 9.RESONANT CONVERTER/INVERTER 055 Hybrid Phase-Shift-Controlled Three-Level and LLC DC DC Converter With Active Connection at the Secondary Side 056 Analysis and Design of LLC Resonant Converters With Capacitor Diode Clamp Current Limiting 057 A Secondary-Side Phase-Shift-Controlled LLC Resonant Converter With Reduced Conduction Loss at Normal Operation for Hold-Up Time Compensation Application 058 Optimal Design Methodology for LLC Resonant Converter in Battery Charging Applications Based on Time-Weighted Average Efficiency 059 Analytical Model of the Half-Bridge Series Resonant Inverter for Improved Power Conversion Efficiency and Performance 060 Multi-MOSFET-Based Series Resonant Inverter for Improved Efficiency and Power Density Induction Heating Applications 10.HIGH VOLTAGE 2014 A)INTERLEAVED CONVERTERS 061 A High Gain Input-Parallel Output-Series DC/DC Converter With Dual Coupled Inductors

57 062 Bidirectional PWM Converter Integrating Cell Voltage Equalizer Using Series-Resonant Voltage Multiplier for Series-Connected Energy Storage Cells 063 Multicell Switched-Inductor/Switched-Capacitor Combined Active- Network Converters 064 Reliability Evaluation of Conventional and Interleaved DC DC Boost Converters B)SWITCHED CAPACITOR BASED CONVERTERS 065 A Novel Switched-Coupled-Inductor DC DC Step-Up Converter and Its Derivatives 066 Ripple Minimization Through Harmonic Elimination in Asymmetric Interleaved Multiphase dc-dc Converters 067 Analysis of the Interleaved Isolated Boost Converter With Coupled Inductors 068 High Step-Up Interleaved Forward-Flyback Boost Converter With Three-Winding Coupled Inductors 069 A Novel Transformer-less Interleaved Four-Phase Step-down DC Converter with Low Switch Voltage Stress and Automatic Uniform Current Sharing Characteristics 070 Nonisolated High Step-Up DC DC Converters Adopting Switched- Capacitor Cell 071 A Family of High-Voltage Gain Single-Phase Hybrid Switched-Capacitor PFC Rectifiers 072 A High-Efficiency Resonant Switched Capacitor Converter With Continuous Conversion Ratio 073 A Cascade Point of Load DC-DC Converter with a Novel Phase Shifted Switched Capacitor Converter Output Stage 074 Modeling Approaches for DC DC Converters With Switched Capacitors 11.ZVS, ZCS (SOFT SWITCHING) CONVERTERS 075 Resonance Analysis and Soft-Switching Design of Isolated Boost Converter With Coupled Inductors for Vehicle Inverter Application 076 An Adaptive ZVS Full-Bridge DC DC Converter With Reduced Conduction Losses and Frequency Variation Range 077 An Integrated High-Power-Factor Converter with ZVS Transition 078 A Novel Load Adaptive ZVS Auxiliary Circuit for PWM Three-Level DC DC Converters

58 079 Hybrid Modulated Extended Secondary Universal Current-Fed ZVS Converter for Wide Voltage Range: Analysis, Design, and Experimental Results 080 Two-Stage Power Conversion Architecture Suitable for Wide Range Input Voltage 081 Naturally Clamped Zero-Current Commutated Soft-Switching Current-Fed Push Pull DC/DC Converter: Analysis, Design, and Experimental Results 082 A Soft-Switched Asymmetric Flying Capacitor Boost Converter with Synchronous Rectification 12.MULTIPORT CONVERTER 083 A Nonisolated Three-Port DC DC Converter and Three-Domain Control Method for PV-Battery Power Systems 084 A Power Decoupling Method Based on Four-Switch Three-Port DC/DC/AC Converter in DC Microgrid 085 Three-Port DC DC Converter for Stand-Alone Photovoltaic Systems 086 A Family of Multiport Buck Boost Converters Based on DC-Link- Inductors (DLIs) 087 An Isolated Three-Port Bidirectional DC-DC Converter for Photovoltaic Systems with Energy Storage 13.MULTIPLE OUTPUT CONVERTER 088 A High Step-Down Multiple Output Converter With Wide Input Voltage Range Based on Quasi Two-Stage Architecture and Dual- Output LLC Resonant Converter 089 Single-Inductor Dual-Output Buck Boost Power Factor Correction Converter 14.AC TO AC CONVERTER 090 A Bridgeless BHB ZVS-PWM AC-AC Converter for High-Frequency Induction Heating Applications 091 Novel Single-Phase PWM AC AC Converters Solving Commutation Problem Using Switching Cell Structure and Coupled Inductor 092 Soft-Switching AC-Link Three-Phase AC AC Buck Boost Converter 093 Ultra sparse AC-Link Converters 15.INVERTER & MULTILEVEL INVERTER 094 Discontinuous Modulation Scheme for a Differential-Mode Cuk Inverter

59 095 A High-Efficiency MOSFET Transformerless Inverter for Nonisolated Microinverter Applications 096 A Multilevel Energy Buffer and Voltage Modulator for Grid-Interfaced Microinverters 097 Extended Boost Active-Switched-Capacitor/ Switched-Inductor Quasi- Z-Source Inverters 098 Grid-Connected Forward Microinverter With Primary-Parallel Secondary-Series Transformer 099 Minimization of the DC Component in Transformerless Three-Phase Grid-Connected Photovoltaic Inverters 100 Single Inductor Dual Buck Full-Bridge Inverter 101 A Single-Phase Cascaded Multilevel Inverter Based on a New Basic Unit With Reduced Number of Power Switches

60 TECHNICAL COURSE OFFERINGS Courses Embedded System, PCB Designing, MATLAB (DSP,DIP, SIMULINK,DAP,DVP), Networking, Network Security, Android Application Development, Electronic Circuit Creation and Debugging Classes Weekend and Holidays Duration 6 Month (60 Hours) Fee (Others) Rs 8750 Offerings Complete Study Material, Training, Certifications,Journal Publication Support and Placement Support Batch Starts 6 th Sep 15 and 27 th September (2 Batches) Short Term Courses Courses Embedded System, PCB Designing, MATLAB (DSP,DIP, SIMULINK,DAP,DVP), Networking, Network Security, Android Application Development, Electronic Circuit Creation and Debugging Classes Weekend and Holidays Duration 2 Month (20 Hours)

61 Fee (Others) Rs Offerings Complete Study Material, Training, Certifications,SDK,Journal Publication Support Batch Starts 6 th Sep 15 and 27 th September (2 Batches)

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