3-Phase Multi-Pulse Rectifiers with Different Phase Shifting Transformers and Comparison of Total Harmonic Distortion

Abstract

This paper addresses the comparison of a multi pulse rectifiers which designed with different topologies as star-delta-zigzag connection and their couples (delta-star, delta-delta, star-delta, star-star, zig-zag) for different phase shifting features. It is important because using different transformer pairs with different number of pulses will change the output voltage's total harmonic distortion. The purpose of this work is to compare the possible transformer structures in terms of Total Harmonic Distortion (THD) and power factor value with good voltage regulation. Multi pulse rectifiers with 6-12-18-24-36-pulse will also be added to the comparison work. Simulation results are given to assess the performance of these topologies in terms of power factor and THD. To meet power quality requirement over multi-pulse rectifiers, THD value needs to be lowered, this study compare which transformer configurations and number of pulses give better power quality.