Fuzzy Double Model Control for Air Supply on a PEM Fuel Cell System

Oxygen excess ratio control is closely related to the performance and safety of a Proton Exchange Membrane fuel cell system. Some control strategies should be used to regulate the oxygen excess ratio at the suitable value in order to avoid stack starvation and damage. And in this paper, a simple fuzzy double model control has been proposed to adjust the oxygen excess ratio under variation load currents. The double model controller combines a PID controller and a fuzzy logic controller which can be switched based on the fuzzy inference rules during the regulation process. The simulation results demonstrate that the fuzzy double model control can adjust the oxygen excess ratio at the setting point when the current is changed, and improve the dynamic performance of oxygen excess ratio than fuzzy PID control.

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