| A power converter is required to boost the lower DC or to inverter from the DC to AC when a proton exchange membrane fuel cells(PEMFC)is used to supply power for the loads or grid-connected power generation.During this process,the50 Hz output AC of the power converter will cause a low-frequency(100Hz)current ripples(LFCR)on the output side of the PEMFC,which has a great influence on the performance and lifetime of PEMFC.In this paper,aim at the influences problems of the LFCR,such as the output voltage,output efficiency and lifetime of the PEMFC,and reducing the LFCR,a series of researches have been carried out.The paper mainly includes the following content.(1)The operating principle and output characteristics of the PEMFC are described in detail.The research status of fuel cells in home and abroad is introduced.The topologies and control methods of different fuel cells power converter are analyzed and compared.(2)The generation mechanism of LFCR and the influences on the PEMFC are analyzed in detail.The main suppression methods are summarized into three types:the passive compensation method,the active compensation method,and the hybrid compensation method.(3)The active clamping technology is used in the traditional push-pull circuit topology.An active + passive hybrid compensation method is proposed to suppress the LFCR of PEMFC,in order to reduce the harm of LFCR to the PEMFC,improve the efficiency of the system,and prolong its lifetimes.(4)Based on the simulation software MATLAB/SIMULINK,the simulation experiments have been made by employing the topology and method.Through the comparison and analysis of the simulation results,the rationality and feasibility of the compensation method are verified. |
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