| With regard to energy conservation and emission reduction and efforts by countries to ac hieve carbon neutrality,hydrogen energy as a secondary energy source with a wide range of n on-polluting sources,is widely used in the field of transportation and is the best choice for deep decarbonization in the field of transportation.Therefore,scientific researchers and related companies in various countries have begun to use the proton exchange membrane fuel cell(PEMFC)as a vehicle power source and conducted extensive research and actual vehicle demonstration operations.This paper is based on the school-business project "Hydrogen Fuel Cell Bus Demonstration Application",based on the fuel cell system of a hydrogen fuel cell bus of an enterprise,uses actual vehicle parameters to model the system and study the temperature control,and through the basis of the fuel cell system model In the above,the power matching model was established,The rationality of power matching between fuel cell output and auxiliary power battery output was discussed.First,there is a stack of hydrogen fuel cells model is developed based on the electrochemical reaction principle,then an air supply system and hydrogen supply system are established simultaneously,as well as a hydrogen fuel cell device concept that takes vehicle power requirements into account,temperature,air metering ratio and other considerations.The simulation effects produced by the cell voltage,using the air compressor from a real car,the relative humidity of the stack and the full power conditions are obtained.hydrogen circulating pump,amount of cells in the stack and other parameters.The polarization curve is compared to the real vehicle data is used to verify the model’s accuracy,and the model is then used to assess the effect of various humidification processes,temperature,and air metering ratio on fuel cell efficiency.Second,the fuel cell thermal control concept is coupled based on the checked fuel cell device model to study the fuel cell stack temperature transition as the vehicle’s battery system power demand increases.By utilizing the temperature disparity between the stack inlet and outlet and the fuel cell stack temperature error is kept to a minimum by adjusting the thermal management model parameters to reasonably control the fuel cell stack temp.the engineering permissible error limit and the model correctness is further tested.Finally,under different operating conditions,a power matching model for fuel cell output power and auxiliary battery output power is developed based on vehicle dynamics requires.Input vehicle mass,the target vehicle’s rpm,air and rolling resistance coefficients,and related data battery pack parameters into the model to analyze the rationality of vehicle power matching under various working conditions.Research reveals that if the whole vehicle’s power demand is less than the battery stack’s rated the battery will provide the vehicle with output power.with the requisite power.If the vehicle’s needed power exceeds the battery’s rated output power,the battery stack and power battery pack would be delivered together,verifying the reasonableness of the fuel cell system’s output power meeting the target vehicle’s demand.Via fuel cell device simulation and verification and power matching model,the model may be used to build a practical fuel cell system and check the logic of each sub-model selection in the system while manufacturing high-power fuel cell buses. |
