Study of Control Strategy for Three-Phase Interleaved Parallel Flying Capacitor DC/DC Converter
Non-isolated DC/DC converters have the advantages of high efficiency,low cost and small size,and are widely used in high-power energy storage systems.From the perspective of improving the output power of the system and reducing the output current ripple,this paper proposes a control scheme for the three-phase interleaved parallel flying capacitor DC/DC converter for the problem of topological phase current sharing and the dynamic response ability of flying capacitor voltage.The decoupling method and overall control strategy of converter output and flying capacitor voltage control were designed,and the fuzzy autotuning PI controller of flying capacitance was designed to improve its dynamic response ability.Through simulation experiments,the results show that the proposed control method can reduce the output current ripple and realize the current sharing between phases,and the fuzzy autotuning PI control was used to improve the dynamic response ability of the flying capacitor voltage control.
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