A Novel Circulating Current Suppression for Paralleled Current Source Converter Based on Virtual Impedance Concept

The circulating current is one of the important issues for parallel converters. It affects system stable operation and degrades power quality. In order to reduce converter harmonic pollution grid, a new suppression strategy proposed source without any communication line. This able realize sharing between modules by changing external characteristics thus suppress among control adopts DC-side droop AC-side virtual impedance control. used generate reference voltage each module, while suppression. We performed time domain test converter, results show that reduced RMS 50% effectively grid-side THD ensuring converter. effectiveness was, therefore, verified.