The research on power grid frequency regulation strategy with the coordination of vehicle-to-grid and grid-friendly appliances

The improvement of smart grid interactive technology provides the basis for the development and utilization of demand-side resources, and the auxiliary frequency regulation by demand-side resources becomes development direction. The electric vehicles (EVs) not only meet the requirements of the society for energy and environmental protection, but also have the characteristics of fast response speed, which is suitable for frequency regulation. This paper establishes the power system frequency response model with the coordination of EVs and GFAs. Based on the model, the paper analyzes the frequency regulation performance with different capacity of EVs and GFAs in single area, and calculates the optimized capacity that can satisfy the requirements. Because centralized control has better response effects than decentralized, this paper focuses on centralized controlled EVs in multi area grid frequency regulation. The control logic contains frequency deviation and tie line power deviation, and sets the dead band to ensure centralized controlled EVs to quit in time. The optimal coordinated capacity, proportion and control strategy are analyzed. The simulation results show that the collaboration of EVs and GFAs has a better effect than only insufficient EVs involved in. Also, centralized controlled EVs can participate in restraining power deviation of tie line in multi area interconnected system, which contributes to the frequency recovery after disturbance.