IMPROVED SLIDING MODE CONTROL STRATEGY FOR PEMFC GRID CONNECTION UNDER VOLTAGE IMBALANCE CONDITIONS

Yang Xuhong; Zhu Peng; Qian Fengwei; Xu Qingguo

doi:10.19912/j.0254-0096.tynxb.2024-2307

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (5) : 551-559. DOI: 10.19912/j.0254-0096.tynxb.2024-2307

IMPROVED SLIDING MODE CONTROL STRATEGY FOR PEMFC GRID CONNECTION UNDER VOLTAGE IMBALANCE CONDITIONS

Yang Xuhong¹, Zhu Peng¹, Qian Fengwei², Xu Qingguo²

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Abstract

Unbalanced three-phase grid voltage causes a coupling effect between DC and AC power, leading to low-frequency pulsation in the output current of the proton exchange membrane fuel cell （PEMFC）, which distorts the grid-connected current. This issue not only affects the power quality but also negatively impacts the overall efficiency and stability of the energy conversion system. To address this issue, this paper proposes a comprehensive control strategy based on improved super-twisting sliding mode control（STSMC）, aiming to eliminate the fuel cell output current pulsation and reduce the total harmonic distortion （THD） of the grid-connected current. The proposed control strategy includes a DC-DC converter employing STSMC combined with a nonlinear state observer to ensure rapid response to disturbances in the fuel cell. Additionally, for the DC-AC inverter, an improved super-twisting sliding mode control strategy is applied, incorporating an enhanced reaching law to adapt to unbalanced grid-voltage conditions, thereby improving system robustness. By doing so, the sliding mode controller reduces coupling between active and reactive power, thereby maintaining stability despite grid voltage variations.

Key words

proton exchange membrane fuel cell / electric power system control / sliding mode control / grid imbalance voltage imbalance

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Yang Xuhong, Zhu Peng, Qian Fengwei, Xu Qingguo. IMPROVED SLIDING MODE CONTROL STRATEGY FOR PEMFC GRID CONNECTION UNDER VOLTAGE IMBALANCE CONDITIONS[J]. Acta Energiae Solaris Sinica. 2026, 47(5): 551-559 https://doi.org/10.19912/j.0254-0096.tynxb.2024-2307

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