Parameter Identification of Electrical Equivalent Circuits including Mass Transfer Parameters for the Selection of the Operating Frequencies of Pulsed PEM Water Electrolysis

Jae-Hoon Kim, Chang-Yeol Oh, Ki-Ryong Kim, Jong-Pil Lee and Tae-Jin Kim ()
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Jae-Hoon Kim: Power Conversion System Research Center, Korea Electrotechnology Research Institute (KERI), Gwangju-si 61751, Republic of Korea
Chang-Yeol Oh: Power Conversion System Research Center, Korea Electrotechnology Research Institute (KERI), Gwangju-si 61751, Republic of Korea
Ki-Ryong Kim: Power Conversion System Research Center, Korea Electrotechnology Research Institute (KERI), Gwangju-si 61751, Republic of Korea
Jong-Pil Lee: Power Conversion System Research Center, Korea Electrotechnology Research Institute (KERI), Gwangju-si 61751, Republic of Korea
Tae-Jin Kim: Power Conversion System Research Center, Korea Electrotechnology Research Institute (KERI), Gwangju-si 61751, Republic of Korea

Energies, 2022, vol. 15, issue 24, 1-16

Abstract: This paper proposes a parameter identification method for a PEM electrolyzer electrical equivalent circuit for pulse electrolysis. Since general water electrolysis mainly uses DC currents, identifying equivalent circuit parameters using electrical characteristics mostly ignores the operation frequency and unnecessarily adheres to the secondary RC model. However, looking at the Nyquist plot of the PEM electrolyzer, it can be confirmed that identifying the operational frequency is necessary, and the secondary RC model correction is essential. Therefore, the proposed method confirms the necessity of reconstructing an electrical equivalent circuit with a primary RC model by analyzing the transient cell voltage using step current inputs and calculating an appropriate operating frequency by identifying the parameters of the reconstructed equivalent circuit. To verify the proposed parameter identification method, a simulation was constructed from the raw test data of a 400 W commercial PEM electrolyzer. In addition, the hydrogen production amount was compared to DC using a pulse electrolysis experiment at the operating frequency obtained by the proposed method.

Keywords: electrolyzer (EL); electrical modeling; operating frequency; parameter identification; proton exchange membrane-type electrolyzer (PEMEL); pulsed electrolysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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