THREE PORT DC-DC CONVERTER FOR STANDALONE PHOTOVOLTAIC SYSTEM

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1 Volume 117 No , ISSN: (printed version); ISSN: (on-line version) url: doi: /ijpam.v117i8.14 ijpam.eu THREE PORT DC-DC CONVERTER FOR STANDALONE PHOTOVOLTAIC SYSTEM Maithili.P 1, Sharmitha.D 2 1, 2 Assistant Professor, Department of Electrical and Electronics Engineering, Kumaraguru College of Technology,Coimbatore , Tamilnadu, India. 1 maithili.p.eee@kct.ac.in 2 sharmitha.d.eee@kct.ac.in ABSTRACT The most commonly used renewable energy is the solar energy. The Efficiency and cost of the PV system is an important criterion. In this paper, a three - port DC-DC for Photo-Voltaic system is designed with improved forward-flyback topology. This is designed to achieve high step-up capability and its system efficiency improvement using multiple operation modes of a. In this paper, the coupled inductor which acts as the transformer provides flexible voltage conversion ratio and galvanic isolation. Switching pulses to the are generated by PWM and Phase shift control technique thereby giving almost constant output voltage regulation. The design of proposed is done with MATLAB Simulink software. The with three operating modes is designed and results analyzed with experimental work. The proposed results compared with Two port. Keywords: DC-DC conversion, MPPT, PWM, Phase shift Technique INTRODUCTION PV based power generation is of prime importance nowadays, because the cost of photovoltaic panels is reducing continuously. Stand-alone systems are used in applications like satellites, unmanned aerial vehicles, and domestic applications. These systems need storage elements to accommodate the intermittent solar power generation. Conventionally, the two port topology utilizes the dual active bridges, full bridge or half bridge which can support the multiport structure to some extent. By those methods, it is not easy to achieve multiple inputs and multiple outputs for power electronic applications. The traditional method implementing a multi port system is done with the help of a transformer with multiple secondary windings. But it will have a drawback that they are nonbidirectional in power. Another conventional is triple half bridge bidirectional, which needs two high frequency three winding transformers and six MOSFET switches, which leads to circuit complexity. It also makes the system expensive. this is also not able to maintain soft switching in case of wide operating voltages at the ports. The two port DC-DC uses the flyback topology. It uses a high frequency transformer. It has two modes of operation. The efficiency of this system is quite poor. Three port s are capable of providing a single unit solution which interfaces multiple energy sources and also common loads. These s can perform better than the conventional two port s due to their small size and their lower part count. It becomes more attractive due to their multiple energy source connection, low cost, compact size. In this, the coupled inductor which acts as the transformer is used to provide galvanic isolation and flexible voltage conversion ratio. The conventional utilizes the triple active bridges with a special feature of power controllability and zero voltage switching. If the two series resonant tanks are implemented, their soft switching performance can be improved. To extend the operating range of zero voltage switching, pulse width modulation and phase shift control techniques can be employed.. Through this method, the power flow in each loop can be controlled separately, the interfaces with the three components PV array, battery and the load. To achieve decoupled port control, flexible power flow and high step up capability, this proposed system combines the isolated three port topology with an improved control strategy. This makes the system simple and cheap..to overcome the disadvantages in two port DC-DC, the three port DC-DC is designed which combines both the flyback and Forward topologies. In the flyback topology, the coupled inductor stores energy in the magnetic field in the inductor air gap during the time, when the switching element [MOSFET] is conducting. In the forward topology, the coupled inductor acts like a transformer and it does not store energy during the conduction time of the switch, since transformers cannot store significant amount of energy. Therefore, during the switch conduction, the energy is passed directly to the output. The maximum output voltage of the forward is constrained by the transformer turns ratio while the output voltage of a flyback is infinite theoretically. In this paper, the output voltage of load and solar panel input voltage can be controlled independently by the PWM and the Phase shift. This paper gives rise to a new isolated three port topology with an improved control 67

2 strategy. Hence decoupled control, flexible power flow and high power capability can be achieved BLOCK DIAGRAM FOR 3 PORT DC -DC CONVERTER The DC input from the panel is given to the and the PIC microcontroller is shown in Figure 1. The controller operates the MOSFET driver circuit and sends pulses for any pair of MOSFET switches depending upon the mode of operation. The coupled inductor stores the energy in the form of magnetic field and delivers the current during the OFF period of the switches. Through mutual inductance, it transfers energy to the load. PROPOSED CONVERTER CIRCUIT DIAGRAM The circuit of proposed is shown in Figure 2.It has combination of forward and flyback topologies. During the conduction time of switch, the inductor stores energy in the magnetic field in the inductor air gap during flyback topology. Whenever the switch turns off, the stored magnetic field collapses. The energy gets transferred to the output of the flyback, which is in the form of electric current. It can be shown as two inductors sharing a common core with windings of opposite polarities. In the forward topology, the coupled inductor works like a transformer with same polarity windings. It will pass the energy to the output during the conduction time of switch. In State 1: S1, S2 will be ON. The current path will be from panel-d0-s1-n1-paneland panel-d0-s2-n1-panel. By mutual inductance, current reaches the load. State 2:S1, S4 will be ON. The current path will be from panel-d0-s1-n1-paneland S4-n1- battery-s4.state 3:S1, S2 will be ON. The current path will be from panel-d0-s1-n1-paneland panel-d0-s2-n1-panel. By mutual inductance, current reaches the load. State 4:S2, S3 will be ON. The current path will be from panel-d0-s2-n1-paneland S3-n1-battery-S3 MODE 2: The second mode is that whenever the panel power is very low, the power from the battery is given to the load. Figure 4 Mode-2 During this mode, S3 and S4 are the main switches. The current path will be from battery to the coupled inductors. By mutual inductance, the power reaches the load. Thus, the circuit works as flyback forward. MODE 3: In this mode, the load is disconnected and the power from the panel is given to the battery Figure 1 Block Diagram for 3 Port DC-DC Converter Figure 2 Circuit diagram of three port DC-DC In this, three modes of operation are possible. The three modes of operation are as follows: MODE 1: In the first mode, the power from the panel is given to the battery and also to the load. Figure 3 Mode-1 Figure 5 Mode-3 State 1: S1, S2 will be ON. The current path will be from panel- D0-S1-n1-paneland panel-d0-s2-n1-panel. State 2:S1, S4 will be ON. The current path will be from panel-d0-s1-n1-paneland S4-n1-battery-S4.State 3:S1, S2 will be ON. The current path will be from panel-d0-s1-n1-paneland panel-d0-s2-n1- panel.state 4:S2, S3 will be ON. The current path will be from panel-d0-s2-n1-paneland S3-n1-battery-S3 PULSE WIDTH MODULATION Pulse-width modulation (PWM) of a signal modulates the duty cycle and which in turn modifies its width of pulses given to switches. It is generally used to either send the information over a communication channel or control the amount of power sent to a load. The average power delivered to the load is proportional to the modulation in duty cycle. By having a high modulation rate, passive electronic filters can be used to smooth the pulse train. High frequency PWM power control systems are easily made to happen with semiconductor switches. The discrete ON/OFF states of the modulation process are used to control the state of the switches which eventually control the voltage across the load or current through the load. The major advantage of this system is the switches are either OFF (not conducting any current), or ON and have (ideally) no voltage drop across the switch. Hence the power loss in MOSFET switches is very low. Phase shift control Phase shift can be defined as the amount by which a wave has been shifted by horizontal means from the original wave. Since the horizontal axis refers time, a phase shift denotes a shift in time from the original wave. Phase shift is normally measured 68

3 in degrees. A complete cycle is represented as 360 degrees. The output voltage of can be controlled by using phase shift control. By phase shift control, the switches attain zero voltage switching, which reduces the switching losses of the. In this proposed system, the output voltage waveforms of the are controlled by both PWM as well as phase shift control strategies. Thus, it makes the more efficient. SIMULATION RESULTS AND DISCUSSION Simulink Model The MATLAB is a productive software platform for technical and mathematical computing, which is used for solving engineering and scientific problems. MATLAB programming is easy-to-use environment where problems and solutions are expressed in familiar mathematical notation. The simulation circuit for three port DC-DC is shown in Figure 6. Mode 2 (Output Voltage) The input temperature is 280F and input irradiance is 10. For an input voltage of 0.823V, and battery voltage of 80v, the output voltage obtained is 75 V. Figure 8 output voltage waveform of mode 2 of three port Mode 3 (Output Voltage) The input temperature is 308F and input irradiance is 180.For an input voltage of 14.82V, the output voltage obtained is 50V. Figure 6 Simulation circuit of three port DC-DC. The Simulink model for three port DC-DC for PV system is simulated using MATLABR2010a. The conventional two port DC-DC is also simulated and both the simulation results are compared and analyzed. Table 1 Simulation results for three port dc-dc S.NO MODES SOLAR PANEL INPUT Figure 9 output voltage waveform of mode 3of three port COMPARISION WITH CONVENTIONAL CONVERTER The simulation circuit of conventional two port DC- DC is shown in Figure 10. The simulation results are compared with proposed results is shown in TABLE 2. 1 MODE MODE 2 3 MODE (Supplied from Battery) Mode 1 (Output Voltage) The input temperature is 308F and input irradiance is 175.For an input voltage of 14.41V, the output voltage obtained is 80V S. N O Figure 10 Circuit diagram for two port DC-DC Table 2 Comparison of Simulation results MODE INPU T VOLT AGE TWO PORT THREE PORT 1 MODE MODE MODE Figure 7 output voltage waveform of mode 1 of three port 69

4 HARDWARE DESCRIPTION In this a keypad is used to change the mode of the operation. The buttons are B1, B2, B3. B1 is for first mode, B2 for second mode and B3 for third mode. A 12V power supply is given to the PIC Microcontroller. The modes are displayed in the LCD. Transformer is used here for transferring the current. The MOSFET driver circuit is used here for isolation. Then a coupled inductor is connected to the DC-DC. When DC input from the panel is given to the and the PIC microcontroller, the controller operates the MOSFET driver circuit and sends pulses for any pair of MOSFET switches depending upon the mode of operation. The coupled inductor stores the energy in the form of magnetic field and delivers the current during the OFF period of switches. It also transfers energy like transformer, thus it conducts energy from the to load. Figure11 Hardware prototype Mode 1 Input voltage=13.6v, battery voltage=12.5v, Output voltage =44.2V Figure 12 output voltage waveform of mode 1 of three port Mode 2 Input voltage=0.5v, Battery voltage=12v, Output voltage=35.1v Figure 13 output voltage waveform of mode 2 of three port Mode 3 Input voltage=12.9v, Battery voltage=12.7v,output voltage=30mv Table 3 Hardware results of three port DC-DC S.NO MODE INPUT BATTERY 1. Mode Mode Mode CONCLUSION: Thus three port dc-dc with three operating modes and high step up capability has designed. The results prove that three port was better with conventional two port. The future scope of this system can be extended to four-port or multi-port s. In four port, in addition to the solar input port, battery port and output port, one wind energy port can be added. Multiport has plenty of interacting control loops due to integrated power trains. The integrated system will have a lower overall mass and more compact packaging. And also has lower cost, improved reliability and enhanced dynamic performance due to power stage integration and centralized control. REFERENCES: 1. S. Kim, H.-S. Song, and K. Nam, Idling port isolation control of three-port bidirectional for EVs, IEEE Trans. Power Electron., vol. 27, no. 5, pp , May C. Zhao, S. D. Round, and J. W. Kolar, An isolated threeport bidirectional DC-DC with decoupled power flow management, IEEE Trans. Power Electrons., vol. 23, no. 5, pp , Sep H. Tao, J. L. Duarte, and M. A.M. Hendrix, Three-port triple-half-bridge bidirectional with zero-voltage switching, IEEE Trans. Power Electron., vol. 23, no. 2, pp , Mar J. L. Duarte, M. Hendrix, and M. G. Simoes, Three-port bidirectional for hybrid fuel cell systems, IEEE Trans. Power Electron., vol. 22, no. 2, pp , Mar M. F. Naguib and L. A. C. Lopes, Harmonics reduction in current sources using fuzzy logic, IEEE Trans. Power Electron., vol. 25, no. 1, pp , Jan L. Hang, S. Liu, G. Yan, B. Qu, and Z. Lu, An improved deadbeat schemewith fuzzy controller for the grid-side threephase PWM boost rectifier, IEEE Trans. Power Electron., vol. 26, no. 4, pp , Apr Figure 14 output voltage waveform of mode 3 of three port 70

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