Analysis of ideal oxygen excess ratio tracking control strategy for proton exchange membrane fuel cells
To ensure that proton exchange membrane fuel cells(PEMFC)operate at maximum net power under different load currents,a numerical simulation model of PEMFC is built using MATLAB-Simulink software based on PEMFC dynamic equations.The model's validity is verified,and the relationship between different load currents and the ideal oxygen excess ratio at maximum net power is established using the least squares method.The model is validated using step signal and sinusoidal signal forms of load current.The simulation results show that PEMFC compressor flow is closely related to the oxygen excess ratio,the oxygen excess ratio is stable with stable compressor flow.The maximum net power and ideal oxygen excess ratio vary with different load currents,as the load current increases,the ideal oxygen excess ratio decreases.The control strategy based on ideal oxygen excess ratio tracking can achieve ideal oxygen excess ratio control under different load currents,which ensures that the PEMFC operates at maximum net power.
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