Zhuohang Chen, Tao Bo, Ruixiong Yang, and Jianduo Li
Sensors; Multiparameter estimation; Crosstalk architecture; MMC-BESS; Full-Time domain; Power equalization; Cooperative control
The Modular Multi-Level Battery Energy Storage System (MMC- BESS) is an energy storage system based on modular multi-level converter technology. Its core component is a battery bank, which achieves efficient energy conversion and energy storage scheduling by distributing a large number of battery cells across various power sub- modules for decentralized management. To ensure that the MMC- BESS cascade architecture maintains power balance distribution throughout the entire time domain and adapts to multi scenario re- quirements, this paper proposes a collaborative control method for full time domain power balance based on sensor multi parameter estimation. This method innovatively uses passive non-contact cur- rent sensors and inverse piezoelectric grating voltage sensing units to achieve high-precision full time domain acquisition of AC/DC volt- age/current. Based on multi parameter estimation, the electrical parameters of the upper and lower bridge arms of each phase cluster are obtained to achieve DC side power balance control and bridge arm submodule AC/DC power regulation. Finally, the full time do- main power balance of the system is maintained through submodule charge state balance. The experimental results show that the max- imum SOC difference of the submodule after control is only 0.12, and the percentage of capacitor voltage fluctuation is less than 5%. Compared with traditional methods, the power balance accuracy is improved by 65%, which verifies the effectiveness of the method in full time domain dynamic response and steady-state stability. Zhuhai Power Supply Bureau, Guangdong Power Grid Co., Ltd., Zhuhai, 519000, China; e-mail: [email protected]; [email protected] Global Mainstream Dynamic Energy Technology Ltd., Hangzhou, 310000, China; e-mail: [email protected]; [email protected] Corresponding author: Tao Bo Recommended by: Saeed Rezaeian-Marjani (DOI:10.2316/J.2026.203-0617)
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