Parallel convertor system with high speed distributed master-slave control method

Considering circulating currentissue in parallel convertor systems (PCSs), a novel high speed distributed master-slave control method is proposed. In this proposed method, real-time current signals, instead of current RMS signals, were transmitted between master convertor and slave one by the high-speed communication bus, and currents of master and slave convertors were balanced in PCSs. Because the real-time current signals transmitted into the slave ones were delayed by the transmission bus, circulating current existed in the PCSs. A mathematical model was built by taking the current signal delay as the input variable and taking the circulating current as the output variable. The analysis of the mathematical model concludes that circulating current is limited by regulating the parameters of the control loops. Theoretical analysisand experimental results indicate that circulating current in PCS is limited by the high speed distributed master-slave control method.