Research On Energy Management Strategy Of Hybrid Energy Battery Electric Vehicle

In recent years,with the continuous growth of global vehicle ownership and environmental and energy issues,the suspension sales of fuel vehicles has become a global trend.Together with the strong support of domestic policies,electric vehicles are bound to usher in a new phase of rapid development.However,because of the limitation of the vehicle power technology on the stage,it is impossible to achieve a single power source to meet the energy power and driving range requirements on a large scale.In view of the problem,this thesis has been studied an electric vehicle power supply scheme that used a high specific energy storage battery and a high specific power ultracapacitor to form hybrid energy system through a DC/DC converter.The main work includes:(1)Based on the analysis of the operating characteristics of the storage battery,ultracapacitor and DC/DC converter and the characteristic indexes of the electric vehicle power supply,the structure of the composite power system was determined.(2)According to the "New Pure Electric Passenger Vehicle Enterprise Management Regulations",the technical requirements of the vehicle power performance to match to the parameters of the hybrid energy system components,and built the Simulink model of each component on this basis.(3)By analyzing the difference in power requirements between the storage battery and the ultracapacitor in the different working modes of hybrid energy,the corresponding fuzzy control rules are formulated and the power management strategy Simulink model was established to realize the rational distribution of energy.(4)The complete electric vehicle model of the hybrid energy was established through the secondary development of ADVISOR.Simulation tests of power performance and driving range under NEDC and UDDS conditions.The simulation results show that the hybrid power energy management strategy in the paper can reach the preset vehicle performance indexes;comparing with the single power supply,the hybrid energy system improves the vehicle’s power performance,economy and driving range;The impact of large current on the storage battery has been weakened by ultracapacitor,it makes the storage battery discharge stably and realizes energy feedback,which effectively improves the service life of the storage battery.