| V2G technology which embodies bidirectional interaction between the grid and Electric Vehicle (EV) is an important component of smart grid technology. Electric energy flows from the grid to EVs when batteries need charge, on the contrary, energy flows from batteries to the grid when EVs are not in use. The realization of V2G technology will prompt grid technology develop to a more intelligent direction and make greater development of EV technology.This paper mainly research V2G model and access system analysis. Analysis model of EVs serving as load and mobile energy storage is set and analysis method of EVs access to the grid when charging (load) and discharging (source) is researched.V2G concept and V2G functions of EVs serving as mobile energy storage are introduced. Advantages and technology problems of V2G functions are analyzed. Begin from analyzing existing battery models, the paper chooses a model only for research of battery outside characteristics. According to known experiment data, basic battery characteristic analysis model is set as well as battery charging/discharging principle and method is researched.Model including three-phase voltage rectifier and DC/DC bidirectional converter, which can realize V2G function is established. Control theory and strategy of bidirectional charger is researched. Simulation modeling and bidirectional charging control of single bidirectional charger is presented.Based on simulation modeling of V2G station, power variation and line length's effects on power transformation of bidirectional chargers charging simultaneously or not are researched.When both charging and discharging exist at one time, V2G station wiring is designed, centralized and decentralized V2G stations are analyzed and influence factors of energy feedback from V2G station to the grid is researched. Strategy flowchart of V2G different operating modes is designed. The factors o influence factors of participating in V2G service are analyzed.
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