Frequency Emergency Control Strategy for Local Power Grid Considering the Joint Response of Energy Storage and Electric Vehicles

To address the problem of frequency emergency control in urban local power grids during extreme events, a frequency emergency control strategy based on the joint response of energy storage and electric vehicles is proposed in this paper. The strategy integrates widely distributed electric vehicles on the load side as dispatchable resources. Leveraging the frequency response capabilities of grid-forming energy storage systems and the grid-connected electric vehicles, it constructs an off-grid frequency emergency control model based on their joint response, minimizing the total control cost. The model optimizes the control outputs of frequency regulation resources inside the local grid, including grid-forming storage, electric vehicles, and shedding loads, ensuring voltage and frequency stability when the local system transitions to the off-grid state. The simulation results based on an actual local grid case demonstrate that compared to traditional frequency emergency control, the proposed strategy reduces total load shedding and improves the transient and steady-state frequency indicators of the off-grid system.