This paper proposes a robust model that optimizes the joint cooperation between the distribution system operator (DSO) and the electric vehicle aggregators (EVAs) considering the forecasting uncertainties. The developed cooperation model considers electric vehicles (EVs) in a vehicle-to-grid operation, fuel-based distributed generators, and wind generators. The purpose of the proposed model is to optimize the operational planning that simultaneously minimizes the DSO’s energy cost and maximizes the revenue of each EVA. The proposed model is applied to a 14-bus distribution system to verify its effectiveness and robustness.