Proposal and Validation of a Series Hybrid System Using a DC-Input Direct Electric-Power Converter D-EPC

A novel hybrid system using DC-input direct electric-power converter (D-EPC) has been proposed. D-EPC is an inverter capable of controlling the distribution of power from two sources. In this paper, the power distribution control of D-EPC achieves the voltage boost for series hybrid system without a boost chopper. The voltage of the smoothing capacitor is controlled at a constant level using the power distribution control of D-EPC to maintain the motor drive voltage regardless of load variations. The effectiveness of the proposed hybrid system was verified by simulation and the prototype D-EPC circuit.