Research On Modeling And Control Of Proton Exchange Membrane Fuel Cell Electric Vehicles

In recent years,new energy vehicles have been developing rapidly in the context of global carbon neutrality.The main routes for the development of new energy vehicles in China include: hybrid vehicles,pure electric vehicles and fuel cell vehicles,among which proton exchange membrane fuel cell(PEMFC)vehicles are considered to be the most promising vehicle power.Therefore,it is important to study fuel cell vehicle power systems.This paper firstly completes the system selection and power system parameter matching of fuel cell vehicle through fuel cell electric vehicle design index.Secondly,the PEMFC system model is established in MATLAB/Simulink,the whole vehicle model of the fuel cell hybrid vehicle is established in AVL/Cruise,and the previously established PEMFC system model is applied to the whole vehicle system in the form of DLL joint simulation for the simulation work of the whole vehicle model.Finally,an improved power following strategy is established and compared with the simulation results of the existing power following strategy,the main research contents are as follows:(1)Determine the topology and parameter matching of the vehicle power system.According to the topology of the fuel cell system and the requirements of fuel cells for automobiles,fuel cell + power cell is selected as the power system structure of the whole vehicle.On this basis,by comparing and analyzing the fuel cell type,power cell type and drive motor type,the selection of key components and performance indexes of the fuel cell vehicle power system were determined.(2)Establishment of PEMFC model and simulation analysis.Through the electrochemical reaction mechanism and working principle of PEMFC,a model of its electric stack and system accessories were established in MATLAB/Simulink and the corresponding simulation work was carried out.The simulation results show that the established PEMFC model can well characterize the operation of the PEMFC and meets the design requirements of this paper.(3)Establishment of the complete vehicle model.The vehicle model of the fuel cell electric vehicle was established in AVL/Cruise,and the determined fuel cell model was added to the vehicle model to complete the establishment of the vehicle model.(4)Establishment of the vehicle power allocation strategy and simulation analysis.The driving conditions is considered to the existing power following strategy,and the target expectation value of SOC is set so that the overall trend of power cell SOC can be stabilized around the target expectation value,and the corresponding simulation work is carried out under NEDC and WLTC conditions.The simulation results show that the improved rule-based power allocation strategy reduces the power fluctuation of the fuel cell stack compared with the original rule-based power allocation strategy,which improves the durability of the fuel cell;the equivalent hydrogen consumption is also reduced and the economy is improved.The power cell SOC stabilizes around the desired value in NEDC and WLTC conditions when the demand power is relatively high and then shows a decreasing trend with increasing distance.