Electric vehicles (EVs) are likely to have a continuing presence in the vehicle market all over the world for the next few decades. When a large number of EVs are charged simultaneously, they could make an extra burden on the distribution grid, whereas their energy storage units possess a great potential to support the grid through the regulation of both active and reactive power. Vehicle to grid (V2G) is being introduced recently as one of the new technologies for such a purpose. This paper presents the grid support from the vehicles for power quality improvement based on V2G systems, in particular the possibility to regulate the active and reactive power to the power grid when there is voltage and frequency fluctuation caused by load variation. A four quadrant operation for converter power flow control strategy based on the grid and EV owners’ requirements is developed. The new control scheme is studied through numerical simulation using Simulink and PSCAD/EMTDC. The results have demonstrated that the proposed V2G technique can be effective for grid power quality improvement.