As the number of electric vehicles (EV), a new category of clean and environmentally friendly transportation means, increases yearly, which not only puts forward new requirements for the modernization of the infrastructure of transportation system, but also demands that the impact on power system be given significant consideration. The increasing of EV utilization in transportation sector and renewable energy integration, such as, PV panel, in local power grid exacerbates system frequency fluctuation. Regulation of system frequency deviation by EV battery storage charging/discharging is a crucial issue for the time being. In this article, a power grid model with a high proportion of PV power is constructed, numerical simulation using time series data is carried out to observe the contribution of the charging/discharging control of aggregated EV group to vehicle to grid (V2G) system frequency regulation. By this way, constructive suggestions are given for the development of charging stations and EV charging/discharging plan, so that the transportation system and power system can be better coordinated and integrated.