Cascade H bridge chain structure can solve effectively the issues of operation and management of medium and low voltage energy storage system

while the output power of each submodel of chain energy storage system contains low frequency fluctuating voltage

therefore large capacitor is mostly used in the proejcts so to reduce the capacitive fluctuation voltage and avoid over voltage of equipment. In this paper

a kind of current feed-forward control algorithm for bidirectional DC-DC chain energy storage system is proposed. 2 times of frequency fluctuation power output is generated by the forestage DC-DC converter so to reduce the 2 times frequency power component of capacitor of the chain structure model

thus decrease DC capacitive voltage fluctuation and reducing the capacitance significantly. The achievement mechanism of the current feed-forward control is described in detail in this paper and the effectiveness of the proposed method is verified by experiment.