Abstract:The large-scale access of electric vehicles brings new challenges to the stability and control of power grid. Electric vehicles connected to the grid can be used as distributed energy storage units to coordinate with traditional AGC units, which can effectively assist the grid frequency modulation and achieve energy saving and emission reduction. Based on the existing research, considering the impact of battery charging status on the maximum battery charging and discharging power and the driving demand of electric vehicle users，and the effect of SOC on the maximum charge / discharge power of the battery. This paper first elaborates the control architecture of electric vehicle participating in grid AGC and charge and discharge control scheme. Secondly, the coordination problem, solution and related constraints of multi-electric vehicles participating in the charging and discharging process of power grid AGC are discussed. Finally, the simulation of the AGC of the electric vehicle participating in the two-area interconnected power grid is carried out. The simulation results show that the proposed method can achieve reasonable power distribution and effective utilization of electric vehicles, so as to improve system stability and achieve energy saving and emission reduction.