STUDY ON NOVEL BATTERY PACK DYNAMIC SERIES EQUALIZATION STRUCTURE AND ITS AC OUTPUT

Huang Jing; Li Jinlong; Luo Kan; Liu Yang

doi:10.19912/j.0254-0096.tynxb.2025-0725

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (9) : 99-106. DOI: 10.19912/j.0254-0096.tynxb.2025-0725

STUDY ON NOVEL BATTERY PACK DYNAMIC SERIES EQUALIZATION STRUCTURE AND ITS AC OUTPUT

Huang Jing, Li Jinlong, Luo Kan, Liu Yang

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Abstract

In this paper, firstly a novel dynamic series equalization structure of the battery pack is proposed, which integrates a converter and equalizer. Secondly, based on this topology, an improved low switching frequency nearest level control strategy is proposed. By sorting the state of charge of the sub-module battery units, the multi-level step wave is output. The voltage harmonic distortion rate of the final output waveform is 13.02% lower than that of the traditional method, and the state switching step is added to avoid the frequent switching of the sub-modules caused by the slow change of the state of charge. At the same time, the equalization control method of mixed variables is introduced, and the equalization parameters such as inductance and duty cycle are analyzed and designed to ensure that the battery unit meets the voltage level requirements before it is put into use, and the difference in state of charge between the battery units is reduced. Through structural integration and control strategy optimization, the efficiency and performance of the battery energy storage system are improved. Finally, the effectiveness of the proposed topology and control strategy is verified in MATLAB.

Key words

battery energy storage system / converter / equalizer / dynamic series structure / nearest level control strategy

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Huang Jing, Li Jinlong, Luo Kan, Liu Yang. STUDY ON NOVEL BATTERY PACK DYNAMIC SERIES EQUALIZATION STRUCTURE AND ITS AC OUTPUT[J]. Acta Energiae Solaris Sinica. 2026, 47(9): 99-106 https://doi.org/10.19912/j.0254-0096.tynxb.2025-0725

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