Research And Simulation Of Vehicle Bidirectional Charger For V2G

With the continuous development of electric vehicles and smart grid applications,On the one hand electric vehicle energy storage battery absorb active from the grid,On the other hand electric vehicle battery sent the energy to the grid,this technology called V2 G has received more and more attention.V2 G technology will be one of the important direction of smart grid construction and application in the future,and the bidirectional charger plays an important role in the realization of energy transmission process between electric vehicles and grid.This paper mainly be interested in the key technologies of bidirectional charger circuit and the control for V2 G single-phase and three-phase operation.The beginning of the article describes the concept of V2 G,the method of realization and the role of the power system,and then briefly introduces the current development of V2 G technology and current Status of Vehicle Bidirectional Charger Industry.Then,the topological structure of V2 G,the topology of DC-DC and AC-DC bidirectional converters used in V2 G system are introduced.Next this paper selected the appropriate topology as the research direction.The mathematical model and the transformation matrix of the three-phase bidirectional AC-DC converter in the stationary and rotating coordinate system are analyzed,and the control method based on each coordinate system is briefly introduced.The paper focuses on the control strategy of V2 G vehicle charger which is suitable for single phase and three phase power network,which mainly include the PLL for single-phase and three-phase grid voltage tracing;bidirectional AC-DC converter current control loop;and the relationship of pulse width modulation indexes selected in the single-phase and three-phase power grid in proposed control strategy.Based on the above control method,we use MATLAB Simulink Simpower to build a unified control model of V2 G single phase and three phase operation.In this paper,the grid voltage tracking method and VSI current control circuit proposed in this paper are simulated and verified.The control method shows a good control effect and verifies the effectiveness of the simulation strategy.Finally,the simulation results of V2 G single phase and three phase operation are carried out to verify the good effect of the proposed control scheme.