MODELING AND CONTROL OF A 3-PHASE CURRENT-CONTROLLED REVERSIBLE AC-DCCONVERTER

A three-phase current-controlled AC-DC converter is presented, which u ses only four active switches to simplify the circuit and achieve a un ity power factor, sinusoidal input current and a bidirectional power f low capability. A small-signal model is derived and, in addition to fe edback control, a three-phase instantaneous voltage detector is propos ed for adaptive feed-forward control to achieve almost zero output imp edance and zero audio susceptibility. A prototype circuit is construct ed and experimental results are presented.