In view of the current situation of fast and large-scale wind power grid-connection in China， an extension to the hybrid pumped-storage power station is proposed. The significance to the power grid dispatching construction is analyzed and summarized. Meanwhile， a general model of multi-reservoirs optimization combined operation is developed according to the functions and features of the hybrid pumped-storage power station. The operation benefits of the hydropower stations of different grid demands are generalized. The algorithm of two-dimensional discrete differential dynamic programming（DDDP） is adopted in conjunction with the successive approximation algorithm（SAA） for solution. Verification by simulation is made for Baishan-Fengman cascade plant in Northeast China.The result shows that the model structure is rational and the algorithm is effective.