Synergistic and priority control for electric vehicles power allocation in participating in AGC

Large scale integration of electric vehicles (EVs) provides new ideas for power system stability and control. Connected to power grid, EVs can be taken as distributed energy storage and thus cooperate with traditional automatic generation control (AGC) units to help stabilize the system frequency and achieve energy saving. On the basis of previous researches, taking into account the influence of battery state of charge (SOC) on the maximum charging/discharging power and the charging demand of EVs users, this paper firstly expounds the AGC control system framework with the contribution of EVs. Then, coordination and priority control scheme for multiple EVs power allocation during the charging/discharging processes is discussed and the main constraints are formulated. Finally, simulations for EVs participating in a two-area interconnected power system AGC are performed. The results show that rational power allocation and effective utilization of EVs resources can be fully achieved by implementing the proposed method, so as to better improve power system stability and achieve energy saving.