Research On Electric Vehicle Of Hybrid Power Storage System

In recent decades,because of the depletion of fossil fuels and increasingly serious environmental problems.Traditional cars can't meet the needs of current social development.It's urgent to develop electric vehicles to ensure the rapid and healthy development of the economy.Power battery is one of the core parts of electric vehicles.Most of the electric vehicles sold in today's market are only supported bu storage battery,which have low power density and short life cycle.The ultarcapacitor has high power density,long life cycle and other advantages.It can complement the characteristics of the battery to form a composite power supply for batteries and ultarcapacitors,providing energy for electric vehicles.It has a great significance in the development of electric vehicles.The research object of this paper is electric vehicle hybrid power system.According to the energy requirements of the composite power system and their respective advantages,the structure of the bidirectional DC/DC converter connected in series with the load and the battery is selected.In order to simulate the driving situation of electric vehicles,BLDC is selected as a driving part of electric vehicles.According to method of SVPWM,it controlled BLDC to stable operation.According to the characteristics of different DC/DC converters,a bidirectional half-bridge DC/DC converter is selected,and a parallel interleaved bi-directional DC/DC converter is adopted.According to the driving situation of electric vehicles,management allocation strategy of fuzzy neural network control energy is made.Building an EV electric power supply simulation circuit in Matlab/Simulink.According to altered conditions of the battery in the composite power supply,the simulation model is simulated.The simulation results show the composite power system reflects the characteristics of high specific power and high specific power,it reduces the number of high current's charging and discharging in battery,and it improves the energy efficiency and power of the vehicle.