Modeling and Simulation of High-pressure Automobile PEMFC Power System

An automotive proton exchange membrane fuel cell system was studied,and a complete mathematical model of a high pressure proton exchange membrane fuel cell system on the system level was proposed,which combined the mechanism and experimental modeling method.The proposed model includes a stack module,an air supplying module,a gas-to-gas humidifier module,a hydrogen supplying module and a cooling module,which nonlinear subsystems are expressed by experimental data tables.A high pressure 83kW PEMFC system simulation model was developed with the Matlab/Simulink and the simulation results,such as the air pressure,the temperature,the humidity,the oxygen stoichiometric ratio and the system voltage,were proposed.The model was validated to compare with the experimental U-I curve.Furthermore,the efficiencies of the high pressure system and the low pressure system were compared and a conclusion was obtained that the former efficiency is higher than the latter efficiency in the high power zone,and vice versa.