Electric vehicles (EVs) can be used as energy storage devices to provide auxiliary frequency regulation service. However,the lack of inertia and damping caused by vehicle-to-grid (V2G) technology will affect the grid's stability. In addition, the users' charging plans are difficult to be completed on time by the current frequency regulation strategies. Therefore, the technology of virtual synchronous generator is utilized to make EVs have similar inertial and damping characteristics to synchronous generator. Then,based on the T-S fuzzy controller,an auxiliary frequency regulation control algorithm for EVs considering user's charging plans is proposed, and the V2G power is jointly determined by the charging states of EVs and the grid frequency. Simulation results demonstrate that the proposed strategy can intelligently control the power flow between the grid and EVs under the conditions of different charging plans, battery states and grid status. As a result,the proposed strategy can effectively improve the frequency stability of the power grid and avoid the risk of overcharge and overdischarge of the batteries while meeting the charging demand of users.