With the increasing scale of hydrogen production from renewable energy

the inherent volatility of renewable energy poses a severe challenge to the accurate modeling of proton exchange membrane (PEM) electrolyzers. In this paper

an equivalent circuit model (ECM) of the PEM electrolyzer is proposed to simulate the dynamic electrochemical characteristics of the PEM electrolyzer under the input conditions of large disturbance and fluctuation. In this model

nonlinear resistance and nonlinear capacitance are used to simulate the electrode impedance characteristics and electrical double-layer capacitance characteristics of the PEM electrolyzer

and the relationship among the ECM

polarization curve

and electrochemical impedance spectroscopy (EIS) is constructed based on the idea of integrating electrochemical and circuit theories. By fitting the polarization curve and EIS test data

the ECM parameters of the PEM electrolyzer are identified. The experimental results show that the model can accurately characterize the dynamic electrochemical behavior of the PEM electrolyzer under different working conditions

with a maximum relative error of only 0.8%. In addition

the model features low complexity

with a simple parameter identification process and good adaptability to electrolyzers with different performance parameters

and can be used in hydrogen power supply

hydrogen production rectifier

and other related fields.