V2G Scheduling Control Strategy Based on Virtual Synchronization

[Objective] With the rapid increase in the number of electric vehicles (EVs), the impact of EV energy storage on the power grid has become increasingly significant. To enable dynamic interaction between EV charging stations and the grid, and to use EV energy storage to regulate load in order to reduce peak-valley differences and mitigate grid impacts, this paper proposes a control and scheduling strategy based on virtual synchronous technology, considering the integration of reactive power response into the new power system. [Method] Firstly, a day-ahead application mechanism was adopted, and a two-layer rolling optimization scheduling model was established to formulate charging plans for each charging station. Then, considering the working mode and characteristics of the V2G (Vehicle to Grid) system, an improved virtual synchronous control method was proposed. Under this control method, power can flow bidirectionally, and optimal power distribution was achieved through the V2G scheduling control strategy, thereby realizing both active and reactive power dispatch responses. [Result] Experimental results show that the proposed strategy effectively reduces the impact of EV charging and discharging on the power system, enhancing system stability. Additionally, by issuing upper-level scheduling instructions to the lower-level V2G converter controls, bidirectional interaction between charging stations and the grid can be well realized. [Conclusion] The combination of the upper-level scheduling strategy and lower-level converter control strategy not only meets the basic needs of the V2G system but also demonstrates excellent output characteristics. This control and scheduling strategy provides strong support for the stable operation of future power systems.