Optimization Of Grid Connected Parameters And Control Strategy For Electric Vehicles

The rapid growth of economy has led to the increasing demand for energy,and non-renewable energy has been unable to meet the current energy demand,so the use of renewable energy in the power system is increasing.But natural renewable energy has inevitable discontinuity,this characteristic will lead to the instability of power,so it needs other energy compensation to smooth the wave of natural and renewable energy sources,and ensure the stability of the frequency of the grid.The concept of V2G is based on this idea,the core idea is to use a large number of electric vehicle's energy storing device as a buffer medium for power grid and renewable energy.Based on the V2G technology,the new PFC circuit is used as the main circuit.The double loop nested control strategy is applied to design the charging and discharging circuit,and verify its feasibility and reliability.Through comparison and selection of appropriate PFC circuit model,a comparison scheme which combines various control strategies is adopted to get a better design of charge and discharge circuit.The dual diode bridge free Boost PFC structure is selected as the main circuit topology,and the average current control mode is selected as the control scheme of the circuit switch tube.The simulation and test results show that the circuit can effectively implement the Boost function and Buck function,and the conversion efficiency is good.This thesis discussed the technology of V2G,on the charge and discharge circuit based on bridgeless PFC technology,and build the circuit according to the data of thedesign requirements,use the average current control method to control the circuit switching device.We use the MATLAB to simulate model,so we get the simulation graphics and data,then design the experiment to validate it.The main content of this thesis is divided into three parts.First,by reference to the relevant literature,analysis and comparison of electric vehicle grid circuit model,select the appropriate circuit model for modeling and system simulation,and simulate the operation state of circuit.Second,research on control logic based on MPC5643 L chip controller.Write control logic and communication protocol,to prepare for the practical feasibility of the system.Third,relying on the SAIC research project,through practical experiments to collect data and analysis it.Through the observation data to evaluate the effect of the V2G system,and optimize it.