RESEARCH ON TOPOLOGY AND CONTROL STRATEGY OF HIGH-GAIN THREE-PORT DC-DC CONVERTER
In view of the problems of low output voltage and large environmental impact in new energy renewable systems such as photovoltaic power generation,this paper proposes a novel high-gain three-port DC-DC converter topology and control strategy.The three ports of this converter are connected to the photovoltaic power generation end,the energy storage port end,and the load end,respectively.It has advantages of low switch device stress,flexible power allocation among input sources,and sirong excitation energy recovery ability of the coupled inductor.The operating principles and steady-state conditions of the converter in various operating modes are analyzed in detail,and the performances of the circuit topology are compared with those of similar converters.According to the control requirements of the optical storage and power supply system and the power flow of the converter under different working conditions,the corresponding mode operation and switching control strategy are studied.A 300 W prototype is built for validation,and the results of the validation demonstrate the feasibility of the proposed structure.
DC-DC convertersenergy managementmultiple-inputhigh gainphotovoltaic power generationmode switching
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