CLOSED-LOOP HAAR WAVELET TRANSFORM ENERGY MANAGEMENT METHOD OF HYBRID ENERGY STORAGE SYSTEM

Shen Yongpeng; Sun Songnan; Wang Yanfeng; Tang Yaohua; Li Yuanfeng

doi:10.19912/j.0254-0096.tynxb.2022-0976

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (10) : 523-530. DOI: 10.19912/j.0254-0096.tynxb.2022-0976

CLOSED-LOOP HAAR WAVELET TRANSFORM ENERGY MANAGEMENT METHOD OF HYBRID ENERGY STORAGE SYSTEM

Shen Yongpeng¹, Sun Songnan¹, Wang Yanfeng¹, Tang Yaohua², Li Yuanfeng¹

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Abstract

Hybrid energy storage systems are widely used in new energy grid-connected, electric vehicles and other fields. Focused on the problem of Lithium-ion battery life attenuation caused by a high-frequency component in load power requirements, a closed-loop Haar wavelet transform energy management method is proposed. Firstly, the circuit structure of the hybrid energy storage system is introduced, and then based on the analysis of the Haar wavelet transform, the Haar wavelet transform energy management strategy and nonlinear proportional algorithm are proposed. Through the Haar wavelet transform, the separation of the high-frequency component and low-frequency component of the power demand is achieved, and the life attenuation caused by the high-frequency component is diminished. Then the nonlinear proportional algorithm is proposed to dynamically adjust the output current of the Lithium-ion battery to keep the DC bus voltage stable. Finally, experiments are conducted under simulated CLTC-P conditions. The experimental results show that the proposed closed-loop Haar wavelet transform energy management method can control the maximum deviation of the DC bus voltage within 2.75%, while effectively avoiding the impact of high-frequency components on the life of the Lithium-ion battery.

Key words

energy storage system / lithium-ion battery / capacitor / wavelet transform / energy management system / closed loop control system

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Shen Yongpeng, Sun Songnan, Wang Yanfeng, Tang Yaohua, Li Yuanfeng. CLOSED-LOOP HAAR WAVELET TRANSFORM ENERGY MANAGEMENT METHOD OF HYBRID ENERGY STORAGE SYSTEM[J]. Acta Energiae Solaris Sinica. 2023, 44(10): 523-530 https://doi.org/10.19912/j.0254-0096.tynxb.2022-0976

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