Reduced-order active disturbance rejection control method for PEMFC air intake system based on the estimation of oxygen excess ratio

To solve the oxygen supply problem of proton exchange membrane fuel cell (PEMFC), this paper presents a reduced-order active disturbance rejection control method for PEMFC air intake system based on the estimation of oxygen excess ratio(EOER-RADRC). First, a control-oriented third-order nonlinear model was established based on PEMFC air intake system. Then, based on the control-oriented model, the disturbance extended state observer was designed to solve the problem of unmeasured cathode pressure parameters in the calculation of oxygen excess ratio (OER), and realize the real-time estimation of OER. Next, aiming at the large phase lag of active disturbance rejection control (ADRC), a reduced-order ADRC method based on reduced-order extended state observer was proposed by a variable substitution technique. So, the proposed method reduces the observation phase lag and improves the dynamic response performance under good anti-disturbance ability. Finally, the simulation and hardware-in-the-loop experience results showed that the proposed method has an excellent control effect compared with other methods.