Research On Vehicle Bidirectional Power Transform Technology Based On V2G Technology

The new energy electric vehicle is considered as a breakthrough to solve the problems of environment and resources.With the popularization of electric vehicles, the scale of electric vehicles can be regarded as important resources used in the smart grid, and improve the efficiency and stability of power grid operation, promote the development and utilization of renewable energy.Electric vehicle occupies a pivotal position in the smart grid in the future.On-board bi-directional power converter as energy converter between smart grid and V2G electric vehicle has become hotspot.According to the application conditions of bidirectional power converter,the single-phase full bridge AC/DC converter and full bridge DC/DC with isolation structure converter are combinated as the two stage circuit topology model of the converter. Secondly, The dissertation briefly analysis the working principle and mode of bidirectional power converter circuit part AC/DC and part DC/DC. And then combined with the system steady state circuit based on the working principle of bidirectional power converter circuit, established the mathematical model of small signal bidirectional power converter of each part of the circuit structure, transfer function block diagram of control charge and discharge direction derived from the AC/DC transform circuit and DC/DC circuit on, and through the MATLAB software control algorithm of the open-loop transfer function of the Bode figure to verify the stability of the system’s control loop.Finally, according to the design index of prototype circuit, designs and selectes of power devices, and analyzes the energy loss of charge and discharge in two directions, using the control algorithm of Pspice software design of bidirectional converter circuit simulation, verify the feasibility of bidirectional power conversion circuit control algorithm design.Based on the control theory and method, the principle prototype is designed and produced, the actual debugging results show that the control theory and method in this paper can meet the design requirements.