HIERARCHICAL PARALLEL EQUALIZER FOR LARGE-SCALE CHAIN BATTERY ENERGY STORAGE SYSTEM

Liu Hongrui; Zhang Bin; Liu Wei; Lin Ziheng

doi:10.19912/j.0254-0096.tynxb.2022-1305

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (6) : 91-98. DOI: 10.19912/j.0254-0096.tynxb.2022-1305

HIERARCHICAL PARALLEL EQUALIZER FOR LARGE-SCALE CHAIN BATTERY ENERGY STORAGE SYSTEM

Liu Hongrui, Zhang Bin, Liu Wei, Lin Ziheng

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Abstract

A hierarchical parallel equalizer is proposed for large-scale chain battery energy storage systems. The equalizer adopts two layers of active balance, the first layer balance and the second layer balance. The first layer balance enables all batteries in the battery system to be balanced simultaneously, its balancing speed is fast and not affected by the number of single batteries in series. The second layer balance enables the parallel balance charging and discharging of multiple battery units from different battery packs, with fast balance speed and high efficiency. In order to verify the effectiveness of the proposed balance method, the working principle of the equalizer and the balancing control strategy is analyzed in this paper, and a battery system consisting of 12 single lithium-ion batteries connected in series is set up for balancing experiments. Both theoretical and experimental results show that the balance topology has fast balance speed, high balance efficiency, strong modularization and easy expansion.

Key words

battery energy storage system / equalizers / lithium-ion batteries / hierarchical parallel balancing / modularization

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Liu Hongrui, Zhang Bin, Liu Wei, Lin Ziheng. HIERARCHICAL PARALLEL EQUALIZER FOR LARGE-SCALE CHAIN BATTERY ENERGY STORAGE SYSTEM[J]. Acta Energiae Solaris Sinica. 2023, 44(6): 91-98 https://doi.org/10.19912/j.0254-0096.tynxb.2022-1305

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