考虑用户充电计划的电动汽车辅助调频控制策略

Auxiliary frequency regulation control strategy for electric vehicles considering users′charging plans

电动汽车(electric vehicle,EV)可作为储能装置参与电网调频,但车网互动(vehicle-to-grid,V2G)过程的低惯性、低阻尼会影响电网稳定性,且目前的EV辅助调频策略无法保证按时完成用户的充电计划。因此,文中将虚拟同步机技术应用于EV的充放电控制中,使充电机具有与同步发电机类似的惯性、阻尼特性。然后,基于T-S模糊控制器,提出一种考虑用户充电计划的EV辅助调频控制算法,EV的充/放电功率由其充电状态和电网频率共同决定。仿真结果表明,所提控制策略能够在不同的充电计划、EV荷电状态和电网频率条件下,智能调节电网与EV之间的功率流动。在满足用户充电需求的同时,该策略能有效提高电网的频率稳定性,规避电池过充、过放风险。

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.