A three phase bidirectional AC to AC buck converter circuit using power MOSFET is designed, rigged up and analyzed with three phase star connected RL load for electrical parameters such as output voltage, input current, input power factor, harmonic profile and efficiency using FPGA real time controller. The various PWM techniques such as ramp-DC symmetrical PWM (RDSPWM), ramptriangular asymmetrical PWM (RTAPWM), sinusoidal asymmetrical PWM type-1 [SAPWM1] and sinusoidal asymmetrical PWM type-2 [SAPWM2] techniques are generated using FPGA real time controller in order to analyze the harmonic profile, input power factor and efficiency of the converter It is required to consider both harmonic profile and input power factor in order to increase the efficiency of power electronic converter. It is observed from experimental results that the RDSPWM technique gives lesser total harmonic distortion [THD] of output voltage and input current than other techniques. It is also observed that the SAPWM1 switching strategy gives high input power factor, more output voltage, high efficiency and moderate improvement of harmonic profile for the entire range of modulation index MI compared to other PWM techniques. Hence SAPWM1 technique is preferred for AC to AC converter than other techniques that renders easy filtration at lower cost.
Department of Electrical and Electronics Engineering, Visvesvaraya Technological University, BNM Institute of Technology, Bengaluru, India
H. A. Vidya
Department of Electrical and Electronics Engineering, Visvesvaraya Technological University, Global Academy of Technology, Bengaluru, India.
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