A Novel Single-Stage Power Conversion Dual-Input Voltage Type Independent Generation System

Photovoltaic, wind and other single new energy power generation usually has the disadvantages of unstable and discontinuous power supply, changing with climatic conditions and day and night, so it is necessary to use multiple new energy combined power generation systems. This paper proposes a novel voltage-type dual input sources independent generation system(IGS) with single-stage power conversion, analyzes the circuit topology , energy management control strategy(EMCS) and steady-state principle characteristics of this type of generation system. The IGS is composed of a parallel-timesharing voltage-type dual input inverter with single-stage power conversion and a battery single-stage bidirectional charge-discharge converter, with their outputs parallel-connected on the AC side. Its EMCS controls the power flow of the charge-discharge converter in real time and realizes the smooth and seamless switching of the three power supply modes by comparing the load power and the total power of multiple input sources. The designed 3kVA IGS prototype has excellent performances such as high conversion efficiency, high output waveform quality, and electrical isolation between multiple input sources-battery-loads.