Analysis of Single-Stage Boost Inverter for Renewable Energy Generation System(REGS) in Discontinuous Conduction Mode(DCM)

摘要

New technologies are expected to lower the investment and reduce cost. Fuel cell generation technologies are now on the verge of being introduced commercially and delivered to market and it might become eminently fuel-efficient and more economical to generate electricity than present utility grid. Unluckily, comprising the systems for power generation from fuel cell have single-phase inverters which draw low-frequency current ripple at twice the output frequency from the fuel cell which may create instability, low efficiency, and lifetime duration of fuel cell stack is shorten. Research in this paper focused on single-stage boost inverter topology with the function of low frequency current ripple (LFCR) reducing to recognition quantity. In addition, present system consists of hybrid switched-inductor step up converter and full bridge inverter which shares a bridge-arm with the converter. The current of boost inductor is designed to work with discontinuous conduction mode (DCM) and analyzed the LFCR in fuel cell output current. The circuit layout, simulation results and performance analysis of 1.26kW/24Vdc, 12kHz are shown to demonstrate theoretical study.