A state-of-charge uniformity control method for energy storage batteries based on distributed cooperative control
Shipeng Li, Yunlong Shang, Bin Duan, Guicheng Chen, Qi Zhang, Chenghui Zhang · 2021 China Automation Congress (CAC) · 2021
This paper proposes a state-of-charge equalization control strategy for energy storage battery modules based on distributed cooperative control. In the information layer, the energy storage module is regarded as an agent, and the state of charge (SOC) uniformity problem model is established by multi-agent system cooperative tracking. The distributed communication network between energy storage module modules is described by digraph. With the help of bounded S-like saturation function and based on the nearest neighbor principle, a bounded cooperative state of charge control law with adjustable control gain is designed. Assuming that the digraph contains spanning trees, the asymptotic stability of the whole closed-loop system is proved by Lyapunov Matrix Equation and LaSalle invariant principle. By adopting the method, the discharge of the energy storage module can be controlled based on distributed coordination, the charging state of the module can be synchronously reduced, and the service life and stability of the energy storage power station can be improved.