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In recent years, photovoltaic and wind power have generations become the most popular renewable energy based generations. However, these power generations cannot supply constant electric power output and sometimes cause the imbalance between supply and demand. To alleviate the mentioned problem, Battery Energy Storage System (BESS), which is significantly expensive, is indispensable. A new idea of Vehicle-to-Grid (V2G) is that a battery of Electric-Vehicle (EV) can be used as an equivalent large-scale BESS in a power system. Thus, the deployment of EVs can reduce the required capacity of BESS. This paper proposes a V2G model considering EV customers' convenience and the State Of Charge (SOC) control method by the local control centers which enables the SOCs of the EVs to be synchronized. The simulation results show that the EVs equipped with the V2G controller can help the conventional thermal power plants suppress the system frequency fluctuation.