The Power System Parameters Design And Energy Management Strategy Research Of Extended Fuel Cell Vehicle

In recent decades,with the increasing environmental pollution and the decreasing of petroleum resources,environmental protection and energy conservation are two major outstanding problems in the world today.Nowadays,the most recognized clean energy in the world is electric energy,which can be used to drive automobiles to solve these two problems.At present,the two key problems of pure electric vehicle,long charging time and short range,are the main bottlenecks hindering its commercial development.In recent years,proton exchange membrane fuel cells(PEMFCs)with the advantages of high energy conversion efficiency,green and pollution-free,high energy density,non-vibration,low noise and many hydrogen-producing raw materials have been increasingly applied in the automotive field.However,its poor cold start performance,inadequate backup power,high price and other shortcomings limit its wide application in automobiles.Therefore,it is of great significance to study the extended fuel cell vehicle to solve practical problems.In this paper,based on the research and design of the control parameters of the energy management strategy of the fuel cell vehicle,the design process of the dynamic parameters of the vehicle is studied.The main work of this paper is as follows:(1)Based on the relevant design indicators of the model,market research is carried out on the main parts of the power system(motor,battery,fuel cell),and the theoretical power parameters of the system are studied to complete the selection and parameter determination of the key components of the power system.(2)Based on the environment of MATLAB/Simulink,the simulation process of ADVISOR top-level model and the simulation model of vehicle power system are built,including driving motor module,battery module and fuel cell module.(3)Contrast and analyze the energy management control strategy,and embedding the power following control strategy into ADVISOR simulation software.By studying the key parameters of the control strategy,the control strategy parameters cs_min_pwr are determined to be 15 kW and cs_max_pwr is 45 kW,so as to ensure the stable operation of battery SOC and good fuel economy.The determination of cs_lo_soc is 0.4 and cs_hi_soc is 0.8 can ensure that the internal resistance of the battery is between 0.01 and 0.02,and the internal resistance consumes less energy and has good fuel economy.(4)The study of fuel economy by different initial and target values of storage battery shows that the closer the initial SOC value is to the target value,fuel economy is better.Through the comparative analysis of vehicle power performance under different mixing degrees,it is concluded that the battery power is the key factor affecting vehicle acceleration and climbing.Finally,the parameters of power system are designed by using FMINCON optimization method of MATLAB toolbox.On the premise that the dynamic performance index of the simulation results can meet the design requirements,at the expense of a part of the dynamic performance,the hydrogen consumption of the whole vehicle is reduced a lot,so as to increase the endurance mileage more effectively.