Control of zero-sequence current in parallel connected voltage source PWM rectifiers using converter-flux-based control

A new zero vector selection strategy for the converter flux based control (CFC) of voltage source PWM rectifiers is introduced. With this strategy the circulating current in paralleled rectifiers is effectively suppressed and independent operations of the individual converter units are achieved. In addition to normal line filter, no additional passive components such as transformers or current sharing reactors are required to parallel the converters. Simulation and experimental results validate the developed model and the proposed zero vector selection scheme