Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Analysis and design of composite-structure resonant switched-capacitor voltage equalization topology for series energy storage systems

  • Liao, Wubing (School of Electric Power Engineering, South China University of Technology) ;
  • Chen, Yuanrui (School of Electric Power Engineering, South China University of Technology) ;
  • Zeng, Jun (School of Electric Power Engineering, South China University of Technology) ;
  • Hong, Xiaobin (School of Mechanical and Automotive Engineering, South China University of Technology)
  • Received : 2021.05.25
  • Accepted : 2021.12.23
  • Published : 2022.04.20
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Abstract

Existing voltage equalization topologies based on the switched-capacitor (SC) operate in the hard-switch state with large energy losses and slow balancing speeds. Therefore, a voltage equalization topology derived from a composite-structure resonant switched-capacitor is proposed in this paper. The proposed topology can achieve zero-current operation and modularity, which reduces system loss and cost. Meanwhile, it can provide two equalization paths from one cell to any other cell, which improves its balancing speed. The zero-current operation, equivalent circuit, design guidelines, and modularization designs for the proposed topology are analyzed in detail. An experiment prototype is established. Results obtained with the prototype verify that the proposed equalizer can achieve zero-current switching (ZCS), high balancing efficiency, and decoupling characteristic between the balancing time and the number of storage cells.

Keywords

Acknowledgement

The authors gratefully acknowledge the financial support of National Natural Science Foundation of China (Nos. 62173148, 51877085).

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