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With the rapid growth of electric vehicles (EV) and the increasingly important role of active distribution grid in modern power systems, the cooperative optimization of power dispatching between power system and electric vehicles has become absolutely necessary. In this paper, a distributed algorithm aimed at optimizing the dispatch of power systems containing EV stations is proposed. When compared with the traditional centralized algorithms, the proposed algorithm proves to be more suitable for the distributed topology of the modern power system. On this basis, a vehicle-to-grid (V2G) price model for EV stations matching this algorithm is set up, and can be used to guide EV stations to schedule their output more accurately. To eliminate the possible line congestions in the optimization process, a dynamic constraint set method is adopted to adjust the obtained optimization results. A 15-node test system with a distributed topology is used to verify the applicability of the proposed framework.