Hybrid energy storage bidirectional DC-DC converter based on Hermite interpolation and linear active disturbance rejection control

作者：Zheng, Hao; Du, Guiping^*; Lei, Yanxiong; Wang, Ruijing

来源：Journal of Power Electronics, 2023, 23(6): 959-971.

DOI：10.1007/s43236-023-00602-6

• Hybrid energy storage system
• Bidirectional DC-DC converter
• Hermite interpolation
• Linear active disturbance rejection control

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.