Research On Energy Management Strategy Of Hybrid Energy Storage System Applied To Electric Vehicle

Electric vehicles will frequently encounter complex driving conditions during driving.Therefore,as far as the hybrid energy storage system is concerned,its load power is equivalent to the power changes required by the operating conditions,which has significant uncertainty.In order to effectively solve the impact of the shock current action caused by load power fluctuations on a single battery as an energy storage for the vehicle,such as the use of a hybrid energy storage composed of a battery and a super capacitor,the advantages of dual power storage such as high power density and high energy density are fully utilized The two types of energy storage components complement each other to enhance the multiple requirements of the power supply and extend the service life of the system.This article mainly corresponds to the energy management strategy and control strategy used in electric vehicle hybrid energy storage system,mainly including the following aspects of work:According to the optimal working limit of the state of charge(SOC)of supercapacitors,On the basis of low-pass filter,an energy management improvement strategy considering the remaining power is proposed,and a simulation model is built in conjunction with a synergistic compensation control strategy.The simulation results show that the premise of the stable bus voltage Next,improve the strategy to reasonably allocate the power required by the hybrid energy storage.Taking the charge state and charge discharge action of super capacitor as state variables,a dynamic power distribution strategy based on smooth control is proposed,and the energy flow of hybrid energy storage system is analyzed.Combined with the synergistic compensation control strategy,a joint simulation model of the dynamic power distribution strategy and the synergistic compensation control strategy based on the smooth control under the typical vehicle conditions of IM240 and ECE15 is built,and the initial state of the supercapacitor SOC is adjusted for simulation verification,and the simulation results are analyzed.On the basis of theoretical analysis and simulation experiments,the hardware platform and software platform are designed,and the experimental platform of hybrid energy storagesystem based on ADI hardware in the loop simulation controller is built.Adjust the initial state of supercapacitor SOC,and complete the joint experimental verification of the dynamic power allocation strategy based on smooth control and the synergistic compensation control strategy.