ONLINE EVALUATION METHOD FOR EIS OF PEM ELECTROLYZER POWERED BY LLC CONVERTER

Jing Kai; Li Fangzheng; Wu Yimeng; Sun Hexu

doi:10.19912/j.0254-0096.tynxb.2024-0260

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (6) : 196-202. DOI: 10.19912/j.0254-0096.tynxb.2024-0260

ONLINE EVALUATION METHOD FOR EIS OF PEM ELECTROLYZER POWERED BY LLC CONVERTER

Jing Kai¹, Li Fangzheng¹, Wu Yimeng¹, Sun Hexu²

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Abstract

In order to evaluate the performance of the electrolyzer in renewable energy hydrogen production systems, especially the performance analysis of the electrochemical impedance spectrum（EIS） of the electrolytic cell, an online evaluation method for the electrochemical impedance spectrum of PEM electrolyzer powered by a full bridge LLC resonant converter is proposed. This method applies a small AC voltage disturbance signal on a stable DC electrolytic voltage to measure the current response and obtain the impedance value. A strategy of inverter rectification collaborative control is proposed for LLC resonant converters. The front stage full bridge variable frequency control obtains stable DC electrolytic voltage, and the post stage outputs a small disturbance signal through PWM rectification control. Finally, the impedance values under different frequency disturbance signals are obtained by analyzing the amplitude and phase of voltage and current signals using fast Fourier transform. The simulation and experiment results show that the impedance spectrum obtained by the proposed method is basically matched with the theoretical values.

Key words

LLC converter / electrolytic cell / electrochemical impedance spectrum（EIS） / PEM

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Jing Kai, Li Fangzheng, Wu Yimeng, Sun Hexu. ONLINE EVALUATION METHOD FOR EIS OF PEM ELECTROLYZER POWERED BY LLC CONVERTER[J]. Acta Energiae Solaris Sinica. 2025, 46(6): 196-202 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0260

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