A new control strategy was proposed for the air supply system of proton exchange membrane fuel cell, which solves the multiple input and multiple output, strong nonlinear coupling and internal and external disturbance control problem of the air supply system, then realizes the precision accurate tracking control of the air flow rate and cathode pressure. The high-order fully actuated system is derived from fourth-order underactuated system of the traditional state space model, and the extended state observer is designed to estimate the unknown disturbance based on high-order fully actuated system. According to the characteristics of high-order fully actuated system, the control law is designed to realize the cooperative control of the air flow and cathode pressure. Finally, through the simulation result comparison with other control strategies, and verified on the experimental bench, the results show that the air flow rate and cathode pressure can be precise controlled.
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