| With the mass production of traditional cars,the environmental crisis and energy crisis are becoming more and more serious,and new energy vehicles have become a hot spot for research and application,however,some problems have emerged in the process of researching new energy vehicles.First,the energy used in existing new energy vehicles is mostly electrical energy,lacking the use of renewable energy such as photovoltaic and wind energy,which does not meet the definition of traditional new energy.Secondly,although there is now a breakthrough in the research for photovoltaic vehicles,the energy available from photovoltaic cells and wind turbines is limited due to the limitation of energy conversion efficiency and installable space,which is far from meeting the power demand of the vehicle.Finally,when the car is in different working conditions,the demanded power is different,resulting in sudden power changes occurring frequently,the battery is shocked,and the service life of the battery is seriously affected.In this dissertation,based on the research of pure electric vehicles,we add the wind and solar hybrid system as an auxiliary power source.The use of wind turbines can help the car to brake and also increase the energy source of the car.On this basis,this dissertation intends to study an energy management control strategy for new energy vehicles to protect the battery and improve the utilization of energy.The energy management control strategy designed in this dissertation for new energy vehicles introduces an energy management system consisting of six parts:battery,supercapacitor,photovoltaic battery,wind turbine,drive motor and control system.When the vehicle is in different working conditions,the energy management of the control system and the start/stop of the fan extend the service life of the battery and increase the energy source of the vehicle.The main research of this dissertation is as follows:(1)Study the demand power of the car and the start-stop conditions of the wind turbine.The dynamics model of the car under different working conditions is established to calculate the demand torque,so as to obtain the demand power of the car and provide the basis and constraints for the subsequent energy management control strategy.The wind turbine has resistance work during operation,so the start-stop conditions of the wind turbine need to be calculated to maximize the output power of the wind turbine.(2)Research on the energy management system of new energy vehicles.Because of the limited output power of photovoltaic cells and wind turbines,a composite power system is needed to power the vehicle.The composite power system needs to meet the load demand of the car under different working conditions,and design the energy management control strategy of the new energy vehicle by combining the charge state of the battery and super capacitor.Meanwhile,in order to help the car to brake and increase the output power of the fan,the fan start-stop control strategy is designed according to the start-stop conditions of the fan.(3)The MATLAB/Simulink model is established to verify the feasibility of the energy management control strategy and the fan start-stop control strategy.The parameters of the model are set,and two working conditions,accelerating uphill and accelerating downhill,are selected for simulation to verify the feasibility of the two controlThe simulation results confirm that the two control strategies of energy management and fan start-stop are feasible,and the application of both control strategies can extend the battery life and increase the energy source of the vehicle.The research results can provide theoretical support for the research of energy management control strategy of new energy vehicles strategies. |
