Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Hybrid energy storage bidirectional DC-DC converter based on Hermite interpolation and linear active disturbance rejection control

  • Hao Zheng (School of Electric Power, South China University of Technology) ;
  • Guiping Du (School of Electric Power, South China University of Technology) ;
  • Yanxiong Lei (School of Electric Power, South China University of Technology) ;
  • Ruijing Wang (School of Electric Power, South China University of Technology)
  • Received : 2022.11.18
  • Accepted : 2023.01.19
  • Published : 2023.06.20
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Abstract

The steady and transient performance of a bidirectional DC-DC converter (BDC) is the key to regulating bus voltage and maintaining power balance in a hybrid energy storage system. In this study, the state of charge of the energy storage element (ESE) is used to calculate the converter current control coefficient (CCCC) via Hermite interpolation. Moreover, the charging and discharging currents of the BDC are controlled by the CCCC. Thus, the ESE runs in the best working region. The linear active disturbance rejection control is used in the current inner loop of BDC to solve the problems of slow dynamic response and parameter tuning in traditional PI control. The method can deal with the great transient response and a vast range of uncertainties, improve the BDC response speed by more than 20%, compensate for the unbalanced power timely, reduce the bus voltage fluctuation, and enhance the disturbance immunity of the system. The proposed method is verified by simulations and experiments.

Keywords

Acknowledgement

This work was supported by the Guangdong Provincial Natural Science Research Team Project: New Energy Efficient Electrical Energy Conversion, 2017B030312001.

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