Oxygen Excess Ratio Control of PEM Fuel Cell Based on Self-adaptive Fuzzy PID

Abstract

Oxygen excess ratio is closely related to the output efficiency and service life of the proton exchange membrane (PEM) fuel cell system. To simulate dynamic behaviors of air flow, a fourth-order model of PEM fuel cell system is established. Then, a self-adaptive fuzzy PID (SFPID) controller is proposed to regulate the oxygen excess ratio on-line through its adaptive characteristic. Under different current disturbances, a comparison of proposed SFPID with several control topologies such as feedforward, PID, and PID plus feedforward (PID-FF) is carried out to validate the advantages of the proposed controller. Moreover, the proposed SFPID controller is applied to track the variable oxygen excess ratio. The simulation results display that the set-point value of oxygen excess ratio can be tracked rapidly and accurately, and verify that the proposed SFPID controller has good dynamic response performance.