Research on V2G Technology Strategy Optimization and Economic Capacity Benefit of Electric Vehicle in Microgrid

V2G aims to coordinate electric vehicles and power grids, improve the stability of electric vehicles to microgrids, and enhance friendly interaction between the two sides. Therefore, V2G technology can be used to combine electric vehicles with microgrids to solve the energy crisis. In addition, in the capacity selection of the distribution transformer, generally only pay attention to the selection of transformer capacity according to the final load, and ignore the economic problems of long-term operation of the transformer. Therefore, it is necessary to select the capacity of the distribution transformer, not only according to the final load to select the final capacity, but also pay attention to the long-term economic benefits of the transformer in different load development stages. On the one hand, the orderly charging and discharging scheduling strategy can satisfy the charging and discharging demand of a large number of electric vehicles, effectively avoid the load peak problem caused by a large number of electric vehicles entering the network, reduce the impact on the power network, and realize the peak cutting and valley filling of the power grid. On the other hand, by making a reasonable control strategy of the converter, the stability of the system at the junction point is improved, and the dynamic response process of the system is improved. By analyzing the relevant data of typical residential areas and comparing with the power development process of developed countries, the improved comprehensive energy efficiency cost method (TOC algorithm) is proposed. By calculating the ratio of investment, maintenance and loss costs to electricity sales income, the method can reflect the economic changes more scientifically and intuitively than the method of simply calculating initial investment and annual loss. It is not only suitable for studying the economic capacity allocation of the prospective year, but also can clearly select the economic capacity of the transformer suitable for the transit period of the planning area, which has a very practical guiding role for the planning personnel.