RESEARCH ON CONTROL STRATEGY OF THREE-PHASE INTERLEAVED DC-DC CONVERTER FOR BATTERY ENERGY STORAGE SYSTEM

Chang Yufang; Gao Peng; Luo Guoao; Zhang Chuangchuang; Yan Huaicheng; Huang Wencong

doi:10.19912/j.0254-0096.tynxb.2024-0076

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (5) : 706-715. DOI: 10.19912/j.0254-0096.tynxb.2024-0076

RESEARCH ON CONTROL STRATEGY OF THREE-PHASE INTERLEAVED DC-DC CONVERTER FOR BATTERY ENERGY STORAGE SYSTEM

Chang Yufang¹, Gao Peng¹, Luo Guoao¹, Zhang Chuangchuang¹, Yan Huaicheng², Huang Wencong¹

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Abstract

In response to the issues of voltage fluctuations in the DC bus and significant current ripple at the battery terminal in battery energy storage systems, this paper proposes a voltage and current dual-loop control strategy for the three-phase interleaved parallel bidirectional DC-DC converter of the battery energy storage system. Firstly, a mathematical model of the three-phase interleaved parallel bidirectional DC-DC converter is established. Secondly, a sliding mode control strategy based on a finite-time extended state observer for the voltage outer loop is designed. Through an improved finite-time extended state observer, the total disturbance of the system is estimated and feed it back to the sliding mode controller for compensation, which improves the response speed and disturbance rejection ability of the system. Next, an adaptive PI current sharing and phase shifting control method in the current inner loop is designed, which divides the total current into three equal parts and controls them individually, reducing the amount of current ripple. Finally, a simulation model and experimental platform are built for validation. The results show that the control method proposed in this paper can effectively suppress DC bus voltage fluctuations and reduce current ripple, and improve the disturbance rejection ability and dynamic response performance of the battery energy storage system.

Key words

battery energy storage system / DC-DC converters / sliding mode control / finite-time extended state observer / current sharing and phase shifting

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Chang Yufang, Gao Peng, Luo Guoao, Zhang Chuangchuang, Yan Huaicheng, Huang Wencong. RESEARCH ON CONTROL STRATEGY OF THREE-PHASE INTERLEAVED DC-DC CONVERTER FOR BATTERY ENERGY STORAGE SYSTEM[J]. Acta Energiae Solaris Sinica. 2025, 46(5): 706-715 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0076

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