Air flow and pressure control of PEMFC air supply system based on ADRC
This paper focuses on the challenge that the cathode air flow and pressure of the proton exchange membrane fuel cell(PEMFC)air supply system are difficult to coordinate and joint control,and proposes a control strategy that combines the differential sliding mode observer and active disturbance rejection control(ADRC).By making reasonable assumptions about the fuel cell mechanism model,a fourth-order nonlinear state space model focusing on the control of oxygen excess ra-tio and cathode pressureis obtained.Given the difficulty of directly measuring the cathode pressure,a sliding mode observer is designed to achieve precise real-time estimation.Through MATLAB simulation,it is found that under dynamic load,the coupling relationship between cathode airflow and pressure makes it challenging for traditional PID to simultaneously achieve optimal control of both variables.In comparison,the ADRC strategy proposed in this article demonstrates better tracking effects of the oxygen excess ratio and the cathode pressure,and significantly reduces their overshoot and adjustment time.
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