PEMFC System Modeling And Policy Validation For Real-time Simulation System

With the worsening of environmental pollution and energy crisis,all walks of life are paying attention to the research on new energy vehicles.Proton exchange membrane fuel cell vehicles(PEMFC)are considered as the focus of future development due to their advantages of high energy conversion efficiency and clean and pollution-free.In order to adapt to the complex on-board conditions,this paper improves the dynamic response of the system by optimizing the system control strategy.The main research contents of this paper are as follows:(1)By analyzing the structure of the proton exchange membrane fuel cell system,combining the thermodynamic formula,energy conservation law and other principles,the model of the proton exchange membrane fuel cell system was built by using MATLAB/Simulink software.It includes fuel cell voltage model,anode and cathode flow model,proton exchange membrane hydration model,temperature model and air compressor model,etc.The results provide a basis for the optimization of control strategy of proton exchange membrane fuel cell system.(2)The influence of different system parameters on the performance of the fuel cell was investigated by using the fuel cell system model.On this basis,unlike most studies that only analyze the influence of a single parameter,temperature and cathode gas excess coefficient are selected as the optimization objects of the control strategy in this paper to explore the influence of various system parameters on the performance.PID control and fuzzy PID control are used to optimize the system strategy,and it is found that the fuzzy PID control has a better control effect on the excess coefficient of cathode gas.(3)In order to better adapt the fuel cell system to the complex on-board conditions,the predictive control method is used to optimize the power following effect of the fuel cell system,and the Cruise software is used to verify the simulation experiment.Then based on the hardware equipment of NI PXI,the fuel cell system hardware in-loop test platform was built on the basis of hardware selection and software design,and the real-time simulation test was completed to verify the control strategy of the fuel cell system built.The test results show that the proposed control strategy can ensure the system to follow the target power stably while keeping the system temperature and cathode gas excess coefficient stable in the target state.