The Research On Integrated Design And Control Strategy Of Power System For Fuel Cell Vehicle

As the global energy crisis and environmental pollution become more and more serious,people pay more attention to the development of new energy vehicles.Because of its non-pollution,zero emission,high efficiency and long driving mileage,hydrogen fuel cell vehicle is regarded as the most ideal form of automobile in the future,and has become the research hotspot of researchers all over the world.Fuel cell vehicle power system is the focus of fuel cell vehicle research,so it is of great significance to carry out the research on fuel cell vehicle power system.Focusing on the integrated design,component modeling,energy management control strategy and simulation analysis of the fuel cell vehicle power system,this paper mainly carry out the following work.Firstly,the fuel cell vehicle powertrain type and components are selected.And based on the MATLAB/Simulink simulation platform,the driver model,vehicle longitudinal dynamics model and main components models of the power system,such as fuel cell,battery,DC/DC converter,drive motor and controller,are built.Then,the fuel cell vehicle model was built and the reliability of the simulation model was verified by relevant vehicle model data.Secondly,the fuel cell vehicle parameters and main performance indicators are determined.And the parameters of the main components are calculated based on the selected cycle conditions,including the drive motor,transmission,differential,fuel cell,battery,etc.The position of the components in the vehicle is arranged.Then the simulation results verify that the parameter matching results meet the vehicle performance index.Thirdly,the control function of the power system is determined by analyzing the working characteristics of the fuel cell system and the battery and the driving conditions of the vehicle.And the advantages and disadvantages of the traditional energy management control strategy are analyzed.Then,the basic principle of dynamic programming algorithm is analyzed.It is determined that the optimization target is the fuel economy standard of the vehicle,and the constraints are the output power range and the power change rate of the battery and fuel cell.The energy management control strategy based on dynamic programming algorithm of fuel cell vehicle is proposed,and the simulation results verify that the fuel economy of the vehicle is optimized.Finally,the fuel economy and the life cycle cost of fuel cell vehicle are taken as the optimization targets,and the dynamic index is used as the constraint condition.And the multi-objective genetic algorithm is used to optimize the power system parameters and control strategy parameters.Then,the vehicle dynamics,fuel economy and component performance of the fuel cell car before and after optimization were simulated and tested,and the effectiveness of the optimization results was verified.