Title: SOC equilibrium control of energy storage system based on cascaded H-bridge

Authors: Yu Shen; Wei Hu; Chengkuan Wan; Xiaoping Li; Fan Yang; Hao Tang

Addresses: Electric Power Research Institute, State Grid Hubei Electric Power Co. Ltd., Wuhan 430077, China ' Electric Power Research Institute, State Grid Hubei Electric Power Co. Ltd., Wuhan 430077, China ' Chengdu Star-River Technology Industry Co. Ltd., Chengdu 610041, China; School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China ' Electric Power Research Institute, State Grid Hubei Electric Power Co. Ltd., Wuhan 430077, China ' Electric Power Research Institute, State Grid Hubei Electric Power Co. Ltd., Wuhan 430077, China ' School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China

Abstract: Aiming at the imbalance of phase and SOC of H-bridge cascade energy storage system, based on the analysis of the topological structure and mathematical model of cascade energy storage system, this paper proposes a SOC equalisation control strategy for cascade energy storage system based on negative sequence voltage injection, and deduces and analyses the working principle of SOC adaptive equalisation control strategy. On the premise of not affecting the current response of the system, the interphase and intra-phase SOC balance of the cascade energy storage system can be realised. Finally, a cascaded energy storage system model is built in the MATLAB Simulink simulation environment. The simulation results verify the correctness and effectiveness of the proposed SOC adaptive equalisation control strategy.

Keywords: H-bridge converter; cascade energy storage system; SOC equalisation; negative sequence voltage; adaptive equalisation.

DOI: 10.1504/IJCIS.2021.118229

International Journal of Critical Infrastructures, 2021 Vol.17 No.3, pp.237 - 250

Received: 11 Feb 2020
Accepted: 13 May 2020
Published online: 15 Oct 2021 *

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