Research On Vehicle Bidirectional Charge And Discharge System Based On V2G

At present,the world is extremely scarce energy,environmental pressure doubled,the urgent need for new energy is increasingly strong.Electric vehicle technology came into being,and get a good development.However,electric vehicle charging and discharging technology is a hot research in the field of electric vehicles,mainly on electric vehicle energy storage technology,as well as energy over recycling technology research.So that the efficiency of electric vehicles to optimize the use of energy to maximize.Wherein the energy storage battery is charged with a device placed on the vehicle body and a device independent of the vehicle body.Stand-alone charging system is placed on the ground or hanging on the wall and other special charging pile,generally in the large charging station,parking lot,residential area with such a charging pile.Lack of flexibility,endurance is not strong;car-type charging system,the general existence of an independent electric vehicle,the prevalence of high cost,large size,low power shortage;and according to the user’s use of electric vehicles can be seen that the current electric car Part of the time are idle,resulting in low energy efficiency.Based on the above problems,this paper presents a two-way charge and discharge system based on V2G technology.The system is to be able to achieve two-way charge and discharge function of the topology of the use of electric vehicles in the original system of power components through a reasonable design.No need to increase the power switch,which greatly reduces the cost,reducing the car space and vehicle weight.And according to the different power supply mode can be three-phase 380V and single-phase power 220V switch each other,to achieve the electric car anytime,anywhere to enhance the flexibility of battery life.And when the AC power supply is unstable,consumption is too large,the electric vehicle energy storage battery can be used as mobile power feedback energy,improve energy efficiency.The structure of the vehicle-based bidirectional charging and discharging system based on V2G technology proposed in this paper is composed of AC/DC reversible converter and DC/DC bidirectional converter,three-phase voltage supply and single-phase mains power supply mode and motor drive Voltage output terminal switching device.In this paper,the traditional topology of the system is analyzed and the topology of the improved topology is put forward.Secondly,the mathematical modeling and control method of the system is analyzed by reasoning,and the simulation model is established in the simulation software.The results were analyzed.Finally,according to the feasibility of the simulation of the system hardware design according to the existing conditions of the laboratory to achieve low-power prototype experiment.And through the experimental platform to simulate the experimental system charge and discharge function of the feasibility.So that the system can be achieved single-phase power 220V slow charge and three-phase 380V high-current fast charge,and when the battery discharge through the experimental platform not only verify the output motor drive voltage to normal operation of the motor.But also can output a stable grid-connected voltage for the grid to achieve energy feedback.So the realization of the two-way charge and discharge function based on V2G technology.