SLIDING MODE VARIABLE STRUCTURE CONTROL STRATEGY OF PV MPPT BASED ON I-V CHARACTERISTICS

Sun Tao; Ge Qiang; Li Juan; Wang Lu; Wang Bozhao

doi:10.19912/j.0254-0096.tynxb.2023-1814

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (3) : 357-364. DOI: 10.19912/j.0254-0096.tynxb.2023-1814

SLIDING MODE VARIABLE STRUCTURE CONTROL STRATEGY OF PV MPPT BASED ON I-V CHARACTERISTICS

Sun Tao, Ge Qiang, Li Juan, Wang Lu, Wang Bozhao

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Abstract

Aiming at the problem that the traditional maximum power point tracking algorithm in photovoltaic （PV） power generation system is easy to fall into the local power peak under shading, a sliding mode variable structure/transient scanning composite MPPT algorithm is proposed. Based on the I-V characteristic curve of solar cells under shading, the instantaneous power of the system is scanned from open-circuit to short-circuit process, and the global power peak is compared and derived in real time. The global power peak is tracked by the sliding mode variable structure control algorithm, which achieves the power output with high tracking speed and high control accuracy. Finally, simulation comparisons are made in Matlab according to different shading conditions, and a photovoltaic experimental platform is constructed to verify that the composite algorithm does not misjudge the power peak and significantly improves the system's response speed and transmission efficiency compared with the traditional control algorithm and a single sliding mode controller.

Key words

solar cells / maximum power point trackers / sliding mode control / shadow shading / transient scanning

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Sun Tao, Ge Qiang, Li Juan, Wang Lu, Wang Bozhao. SLIDING MODE VARIABLE STRUCTURE CONTROL STRATEGY OF PV MPPT BASED ON I-V CHARACTERISTICS[J]. Acta Energiae Solaris Sinica. 2025, 46(3): 357-364 https://doi.org/10.19912/j.0254-0096.tynxb.2023-1814

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