MODEL-FREE PREDICTIVE CONTROL OF DAB CONVERTER BASED ON FUZZY CURRENT OBSERVATION

Zhang Maosong; Zhao Jiaxin; Shu Dongsheng; Xie Fang; Wang Xiuqin; Yu Pan

doi:10.19912/j.0254-0096.tynxb.2024-1285

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (10) : 536-543. DOI: 10.19912/j.0254-0096.tynxb.2024-1285

MODEL-FREE PREDICTIVE CONTROL OF DAB CONVERTER BASED ON FUZZY CURRENT OBSERVATION

Zhang Maosong¹, Zhao Jiaxin¹, Shu Dongsheng², Xie Fang¹, Wang Xiuqin¹, Yu Pan¹

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Abstract

A model-free predictive control strategy based on fuzzy current observation is proposed to address the problem that parameter mismatch can lead to bus voltage deviation when applying model predictive control algorithms to a dual active bridge DC-DC converter （DAB） in a DC microgrid. Firstly, the periodicity of sinusoidal function is used to design a sliding mode observer with multiple stable points for fuzzy observation of output current, which effectively improves the response speed of the observer. Then, the observed value of the sliding mode observer is substituted for the current value in the predictive model of the converter, and it is found through parameter sensitivity analysis that the proposed method can eliminate the steady state error caused by the parameter mismatch of the predictive control model. Finally, a system simulation model and a prototype platform are built to verify the effectiveness of the proposed method.

Key words

microgrids / DC-DC converters / model predictive control / current observer

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Zhang Maosong, Zhao Jiaxin, Shu Dongsheng, Xie Fang, Wang Xiuqin, Yu Pan. MODEL-FREE PREDICTIVE CONTROL OF DAB CONVERTER BASED ON FUZZY CURRENT OBSERVATION[J]. Acta Energiae Solaris Sinica. 2025, 46(10): 536-543 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1285

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