Single-Phase Controlled Rectifier Using Single-Phase Matrix Converter

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1 Volume 4 Issue 7 March 2017 International Journal of Informative & Futuristic Research Single-Phase Controlled Rectifier Using Single-Phase Matrix Paper ID IJIFR/V4/ E7/ 070 Key Words 1st Page No Research Area Power Electronics SPMC, AC-DC, MC, DC link Assistant Professor, Department of Electrical & Electronics Engineering, Ozwin Dominic Dsouza BMS Institute of Technology & Management, Bangalore, India 2nd Harsha Khoker 3rd Riya Ganai 4th Swetha N. A. B. Tech. Students Department of Electrical & Electronics Engineering, BMS Institute of Technology & Management, Bangalore, India Abstract This paper presents the applications of single-phase matrix converter (SPMC) as an AC-DC Controlled rectifier. For basic operation the multiplepwm technique was used to calculate the switch duty ratio to synthesize the output. Safe commutation strategy was developed to avoid voltage spikes due to inductive load. Active current wave-shaping technique are also proposed to ensure that the supply current waveform is continuous, sinusoidal and in phase with the supply voltage. This approach utilizes boost rectifier technique for compensation. I. INTRODUCTION Many theoretical studies have been investigated on Matrix (MC) but have found limited practical applications in power electronics [1]. Nevertheless, MC has been described to offer an "all silicon" solution for AC-AC conversion, removing the need for reactive energy storage components used in conventional rectifier-inverter based system and hence an attractive alternative converter. The topology was first proposed by Gyugyi in Previous reported works mainly dealt with three-phase circuit topologies. The Single-phase matrix converter (SPMC) was first realized by Zuckerberger which was followed by subsequent works on direct AC-AC single-phase converter and DC chopper but none on rectifier operation. This work is published under Attribution-NonCommercial-ShareAlike 4.0 International License Copyright IJIFR

2 The matrix converter has several advantages over traditional rectifier-inverter type power frequency converters [2]. It provides sinusoidal input and output waveforms, with minimal higher order harmonics and no sub-harmonics; it has inherent bi-directional energy flow capability; the input power factor can be fully controlled. Last but not least, it has minimal energy storage requirements, which allows to get rid of bulky and lifetime- limited energystoring capacitors. But the matrix converter has also some disadvantages. First of all it has a maximum input output voltage transfer ratio limited to 87 % for sinusoidal input and output waveforms. It requires more semiconductor devices than a conventional AC-AC indirect power frequency converter, since no monolithic bi-directional switches exist and consequently discrete unidirectional devices, variously arranged, have to be used for each bi-directional switch [3]. Finally, it is particularly sensitive to the disturbances of the input voltage system [4] [5]. II. TOPOLOGY A. The matrix converter consists of 8 bi-directional switches that allow output tobe connected to input. The circuit scheme is shown in Fig.1. The input terminals of the converter are connected to a single phase voltage-fed system, usually the grid, while the output terminal are connected to a single phase current- fed system, like an induction motor might be. The capacitive filter on the voltage- fed side and the inductive filter on the current- fed side are intrinsically necessary. Their size is inversely proportional to the matrix converter switching frequency. B. It is worth noting that due to its inherent bi-directionality and symmetry a dual connection might be also feasible for the matrix converter: a current-fed system at the input and a voltage-fed system at the output. With eight bi-directional switches the matrix converter can theoretically assume 256 (2^8) different switching states combinations. But not all of them can be usefully employed. Regardless to the control method used, the choice of the matrix converter switching states combinations (from now on simply matrix converter configurations) to be used must comply with two basic rules. Taking into account that the converter is supplied by a voltage source and usually feeds an inductive load, the input phases should never be short-circuited and the output currents should not be interrupted. From a practical point of view these rules imply that one and only one bi-directional switch per output phase must be switched on at any instant. Figure 1: Electrode Assembly 6828

3 III. OUTPUT VOLTAGE Since no energy storage components are present between the input and output sides of the matrix converter, the output voltages have to be generated directly from the input voltages. Each output voltage waveform is synthesized by sequential piecewise sampling of the input voltage waveforms. The sampling rate has to be set much higher than both input and output frequencies, and the duration of each sample is controlled in such a way that the average value of the output waveform within each sample period tracks the desired output waveform. As consequence of the input-output direct connection, at any instant, the output voltages have to fit within the enveloping curve of the input voltage system. Under this constraint, the maximum output voltage the matrix converter can generate without entering the over- modulation range is equal to v3/2 of the maximum input voltage: this is an intrinsic limit of matrix converter and it holds for any control law. In Fig. 2 the output voltage waveform of a matrix converter is shown and compared to the output waveform of a traditional voltage source inverter (VSI). The output voltage of a VSI can assume only two discrete fixed potential values, those of the positive and negative DC-bus. In the case of the matrix converter the output voltage can assume the input voltage and its value is not timeinvariant: the effect is a reduction of the switching harmonics. Figure 2 : Output voltage waveforms generated by a VSI and a matrix converter IV. INPUT CURRENT Likewise to the output voltages, the input current is directly generated by the output current, synthesized by sequential piecewise sampling of the output current waveforms. If the switching frequency of the matrix converter is set to a value that is much higher than the input and output frequency, the input currents drawn by the converter are sinusoidal: their harmonic spectrum consists only of the fundamental desired component plus a harmonic content around the switching frequency. In Fig. 3 the input current drawn by a matrix converter for a 2 khz switching frequency is shown. It can be noted that the amplitude of the switching harmonic components is comparable to the fundamental amplitude. It is then obvious that an input filter is needed in order to reduce the harmonic distortion of the input line current to an acceptable level. It follows that care should be used in speaking about matrix converters as an all silicon solution for direct AC/AC power conversion, since some reactive components are needed. 6829

4 The matrix converter performance in terms of input currents represents a significant improvement with respect to the input currents drawn by a traditional VSI converters with a diode bridge rectifier, whose harmonic spectrum shows a high content of low-order harmonics.by the light of the standards related to power quality and harmonic distortion of the power supply, this is a very attractive feature of matrix converter. Figure 3: Matrix converter input current and harmonic spectrum. Switching frequency 2kHz. V. THE INPUT POWER FACTOR CONTROL The input power factor control capability is another attractive feature of matrix converters, which holds for most of the control algorithms proposed.despite ofthis common capability it is worth noting that a basic difference exists with respect to the load displacement angle dependency. Figure 4: Matrix converter input line-to-neutral voltage, instantaneous input current and its average value. Switching frequency 2kHz. VI. THE BI-DIRECTIONAL SWITCH REALIZATION AND COMMUTATION A first key problem is related to the bi-directional switches realization. By definition, a bidirectional switch is capable of conducting currents and blocking voltages of both polarities, depending on control actual signal. But at present time a true bi-directional switch is still not available on the market and thus it must be realized by the combination 6830

5 of conventional unidirectional semiconductor devices. Fig..5 shows different bi-directional switch configurations which have been used in prototype and/or proposed in literature. Another problem, tightly related to the bi-directional switches implementation, which has represented a main obstacle to the industrial success of the matrix converter, is the commutation problem. The commutation issue basically rises from the absence, in the matrix converters, of static freewheeling paths. As consequence it becomes a difficult task to safely commutate the 20 current from one bi-directional switch to another, since a particular care is required in the timing and synchronization of the switches command signals. Figure 5: Possible discrete implementations of a bi-directional switch. VII. THE INPUT FILTER ISSUE Although the matrix converter is sometimes presented as an all silicon solution, due to the lack of the bulky and expensive DC-link capacitors of traditional indirect frequency converter, it also requires a minimum of reactive components, represented by the input filter.the input filter acts as an interface between the matrix converter and the AC mains (Fig. 6). Its basic feature is to avoid significant changes of the input voltage of the converter during each PWM cycle, and to prevent unwanted harmonic currents from flowing into AC mains. As matter of fact, due to the discontinuous input currents, the matrix converter behaves as a source of current harmonics, which are injected back into the AC mains. Since these current harmonics result in voltage distortions that affect the overall operation of the AC system, they have to be reduced.the principal method of reducing the harmonics generated by static converters is provided by input filter using reactive storage elements. Figure 6: Schematic representation of a matrix converter adjustable speed drive. 6831

6 VIII. THE PROTECTION ISSUE Likewise any other static converter, the matrix converter needs to be protected against the over voltages and the over currents that might be destructive for its semiconductor devices. An effective and robust protection scheme plays an important role in the implementation of a stable and reliable power converter. With respect to an AC drive application of the matrix converters, over voltages can originate externally, as voltage surge existing onto the AC mains, or internally as consequence of a switch commutation error or timing inaccuracies that cause the interruption of an output motor current. This commutation-dependent risk is peculiar to the matrix converter which does not have, differently from traditional DC link converter, any automatic static freewheeling path for the output motor currents. As it will be better explained in chapter 3, the commutation strategies for bi-directional switches today available do neither require, in normal operating conditions, freewheeling paths to safely commutate the output currents nor snubber circuit. The only operating condition in which a freewheeling path is needed is when the motor is disconnected due to an emergency shutdown of the converter. In this case, to prevent destructive over voltages from appearing onto the matrix switches a freewheeling path to the motor currents has to be provided. As far as the over currents are concerned, they can rise either from a short circuit through the converter of two input voltages or from an output line-to- line or line-to-earth short circuit. In both cases the protection strategy usually adopted consists in turning all the switches off, using the fact that the currents are monitored and power semiconductors can both withstand and switch considerable overcurrent on a non-repetitive basis [29]. It is obvious that such simply protection strategy can be used only if a freewheeling path is provided to the motor currents. Therefore, the over current protection can be considered as somehow included in the overvoltage protection scheme. Fig. 8 Clamp circuit as common protection for all matrix converter bi-directional switches.the first protection scheme is a clamp circuit made up of one or two capacitors connected to all input and all output lines through two diodes bridges (Fig.8) Figure 8 : Clamp circuit as common protection for all matrix converters bi-directional switches. 6832

7 IX. PROBLEM STATEMENT It has been reported that the use of safe-commutation switches with pulse width modulation (PWM) control can significantly improve the performance of ac/ac converters. However, in the conventional single-phase matrix converter topology, the ac output voltage cannot exceed the ac input voltage. Furthermore, it is not possible to turn both bidirectional switches of a single phase leg on at the same time; otherwise, the current spikes generated by this action will destroy the switches. These limitations can be overcome by using Matrix converter topology. Research on Matrix converters has focused mainly on dc/ac inverters and ac/ac converters. Recently, the work on Matrix converter dc/ac inverters has focused on modeling and control, the PWM strategy, applications, and other Z-network topologies. The Matrix converter ac/ac converters focus on single-phase topologies and three-phase topologies. In applications where only voltage regulation is needed, the family of singlephase Matrix converter ac/ac converters proposed in has a number of merits, such as providing a larger range of output voltages with the buck boost mode, reducing inrush, and harmonic current. However, no one has designed a converter based on a Matrix converter structure and a matrix converter topology that can provide ac/ac power conversion with both a variable output voltage and a step-changed frequency. X. BLOCK DIAGRAM Figure 9: Block diagram of the hardware The block diagram required for hardware implementation is as shown in the figure 9. The hardware circuit implementation is as shown in the figure the Arduino mega 2560 will produces the gate pulses required to operate the matrix converter & it will be provided through the opto-coupler. The output of the matrix converter will be connected to the load. Figure 10: Block diagram of power supply & MOSFET 6833

8 The 230V, AC supply will be stepped down to 12V AC with the help of transformer, the output of the transformer will be connected to the regulator circuit, which internally consists of bridge rectifier, filter & Regulator The output of the regulator will be connected to the opto coupler but the opto coupler will be operated with the help of gate signal given by Arduino. In order to sense the positive & negative half cycle of the input voltage the following block diagram is used. For sensing the positive half cycle the diode will be connected in forward biased condition. For positive half cycle it will give high output. But for negative half cycle the diode will be reverse biased. Figure 11: Block diagram for sensing X1. HARDWARE IMPLIMENTATION 1. Power Supply Circuit: The 230V, AC supply will be stepped down to 12V AC with the help of transformer, the output of the transformer will be connected to the regulator circuit, which internally consists of bridge rectifier, filter & Regulator The output of the regulator will be connected to the opto coupler but the opto coupler will be operated with the help of gate signal given by Arduino. 2. Voltage Sensing Circuit: For sensing the positive half cycle the diode will be connected in forward biased condition. For positive half cycle it will give high output. But for negative half cycle the diode will be reverse biased. Figure 12: Power supply circuit Figure13: Voltage sensing circuit XII. RESULTS AND CONCLUSION 1. Simulation results: The following waveforms are obtained from simulation. SIMU LINK has been used to carryout simulation. 6834

9 Figure 13: input and output current Figure 14: Input and output voltage Figure shows the input and output waveforms for the rectifier simulation with input AC of 12V and output voltage average value of 8 Volts. The output is in discontinuous mode. The load applied is resistive of 100 ohm value. Switching frequency of 2 KHz with an output current of 150 miliamp. 2. Experimental results: Figure shows the output waveform for the rectifier simulation with input AC of 12v and output voltage average value of 8volts. The output is in discontinuous mode. The load applied is resistive of 100 ohm value. Switching frequency of 2 KHz with an output current of 150 miliamp. 3. CONCLUSION Experimental results reveal that, a controlled dc output voltage having an average value of 8volts is obtained. The load current is about 150mA. This controlled dc output can be used in low power drive applications. 6835

10 Acknowledgment Authors would like to thank Dr. Mohan Babu G.N, Principal BMSIT&M for supporting us thought the course of this work. XIII. REFERENCES [1] Catherine Nasr El-Khoury, Hadi Y. Kanaan, Imad Mougharbel A comparative study of four bidirectional sparse matrix converter topologies for wind power applications, IEEE International Conference on Industrial Technology (ICIT), 2015 [2] P.W. Wheeler, J. Rodriguez, J.C. Clare Matrix converters: a technology review, IEEE Transactions on Industrial Electronics ( Volume: 49, Issue: 2, Apr 2002 ). [3] Oyama, J., Higuchi, T., Yamada, E., Koga, T., and Lipo, T., "New Control Strategies for Matrix," IEEE Power Electron. Spec. Conf. Rec., 1989, pp [4] Sobczyk, T., "Numerical Study of Control Strategies for Frequency Conversion with a Matrix," Proceedings of Conference on Power Electronics and Motion Control, Warsaw,Poland, 1994, pp [5] [5] Cho, J.G., and Cho, G.H, "Soft-switched Matrix for High Frequency direct AC-to- AC Power Conversion," Int. J. Electron., 1992, 72, (4), pp TO CITE THIS PAPER Dsouza, D.O., Khoker, H., Ganai, R., Swetha, N. A. (2017): Single-Phase Controlled Rectifier Using Single-Phase Matrix International Journal of Informative & Futuristic Research (), Vol. 4 No. (7), March 2017, pp , Paper ID: IJIFR/V4/E7/

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