Study On Key Technologies Of Electric Vehicles Joint Operation With The Micro Grid In The Smart Grid

In recent years, with the fast development of the smart grid, the electric vehicle (EV), as the typical smart grid electrical appliance in the smart grid, have shown great market potential and development prospect with its low emission and high energy-efficiency features. Meanwhile, the micro grid, which is mainly made up of distributed energy sources, have gained widely application in the smart grid. It enhanced the grid’s flexibility and economical efficiency, and has become an important development direction in the demande side of the smart grid. However, with the growing scales of EVs and their access to the micro grids, the EV charging and battery-changing behaviors have set higher requirements to the EV infrastructures’ service ability, and gradually impact the micro grid, making it the key factors in the development of the EVs and smart grid. Therefore, to understand and develop the key technologies for the EVs joint operation with the micro grid as well as to assess and relieve EVs’ impact to the micro grid, has become the key subject for the development of the EVs and micro grids, showing significant meanings to the development of the EV industry and the micro grid construction.Therefore, this paper discussed the basic theory for the EV access and joint operation with the micro grid, and made an indepth study to the relative mechanisms and key technologies, analysed the EV structure and their refueling measures as well as the main micro grid components and their features. The paper summarized the technology foundations for the joint operation indlucing communication, sensor measurement, smart interaction as well as modeling and visualization, moreover, this paper proposed the key technologies for the joint operation in the smart grid.By the combination of the agent-based, system dynamics and discrete event modeling methods, this paper, based on the operating characteristics of EV, construct the EV charging and battery-changing system model as well as the EV-grid joint operation whole-scene model, realizing the description of the EV operations in the smart grid, and the analysis of its joint operation with the micro grid. Furthermore, base on the object-oriented programming language, this paper develops a micro grid simulation visualization system, and this system is further developed into a complete functional EV-grid joint operation visualized analysis platform. According to the simulation to the proposed model and platform with the practical data, the model can directly simulate the micro grid components operation features, and the impact to the components key parameters with the large-scale EV access can be observed. With the proposed system and platform, this paper made further simulations and evaluations on different micro grid configurations in the proposed model and platform.This paper’s achievements provide important tools for the evaluation of the EV charging and battery-changing system service ability, and provide visualized platform for the prediction and presentation of EV operation regularity in the micro grid, offering systematic support to the micro grid planning, evaluation and optimization, and shall show preferred practical values to the micro grid and EV facilities’construction and strategy-making.