Modeling and analysis of switching frequency circulating current in three-phase parallel inverters

There are circulating currents among the parallel inverters. Based on the existing researches on circulating currents, an accurate model of switching frequency circulating current is proposed in this paper. Moreover, the relationships between the circuit parameters and switching frequency circulating current are investigated and analyzed in detail. Based on the analytical results, favorable design guidelines to restrain the switching frequency circulating currents are further presented. The simulation by means of Matlab is well developed to describe the proposed mathematical model and validates the effectiveness of the theoretical analyses.