HYBRID MODE SMOOTH SWITCHING STRATEGY FOR PV-STORAGE ISLANDED DC MICROGRIDS

Pan Hao; Wang Zhen; Kang Zhuang; Cheng Peng; Jia Limin

doi:10.19912/j.0254-0096.tynxb.2024-1671

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (1) : 377-385. DOI: 10.19912/j.0254-0096.tynxb.2024-1671

HYBRID MODE SMOOTH SWITCHING STRATEGY FOR PV-STORAGE ISLANDED DC MICROGRIDS

Pan Hao¹, Wang Zhen¹, Kang Zhuang², Cheng Peng¹, Jia Limin^1,2

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Abstract

In this paper, an adaptive smooth switching strategy is proposed for PV-storage islanded DC microgrids （IDCMGs） to ensure smooth switching between different operating modes of PV systems and improve the accuracy of bus voltage control. Firstly, a secondary control-based bus voltage adjustment method with time delay compensation is proposed to mitigate the bus voltage deviation caused by transmission delays. Secondly, a weighted average strategy based on a variable-coefficient sigmoid function is designed to adaptively adjust the reference current and mode switching time, ensuring smooth switching of the PV system between droop and MPPT modes and avoiding abrupt changes in system parameters caused by changes in the control loop. Based on the weighted average strategy, an adaptive exponential reaching law sliding mode correction method is introduced to enhance the efficiency and robustness of smooth switching, and the parameters of the sliding mode reaching law are dynamically adjusted to suppress chattering during the switching process. Finally, the effectiveness of the proposed strategy is verified using a hardware-in-the-loop （HIL） experimental platform, and the results demonstrate that the strategy exhibits excellent performance in handling IDCMG mode switching and voltage stability.

Key words

voltage control / microgrid / sliding mode control / droop control / time delay compensation

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Pan Hao, Wang Zhen, Kang Zhuang, Cheng Peng, Jia Limin. HYBRID MODE SMOOTH SWITCHING STRATEGY FOR PV-STORAGE ISLANDED DC MICROGRIDS[J]. Acta Energiae Solaris Sinica. 2026, 47(1): 377-385 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1671

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