Three-Phase Soft-Switched Current-Source Rectifier Operated in Pulse Width Modulation

Abstract

Three-phase soft-switched current-source rectifier with two resonant switches, connected to a thyristor bridge in series and in parallel in order to provide zero-voltage switching or zero-current switching, is studied. The arrangement tested, using four insulated-gate bipolar transistors and six thyristors, is implemented to investigate the soft-switching operations under the sinusoidal pulsewidth modulation. The experimental results confirm that AC current can be controlled with a reversible power flow and with a near sinusoidal waveshaping.