Sequential power generation simulations play a critical role in the capacity configuration of hydroelectric-thermal-wind-photovoltaic-storage multi-energy complementary systems. In practice

8760-hour system operation are hard to simulate directly using an optimization model because of its large scale. In this paper

a new time-scale decomposing technique is developed to solve this problem and realize the accurate simulations of 8760-hour system operation. Based on this

a two-stage optimization model is constructed for capacity configuration of a grid-connected multi-energy complementary system that comprises thermal power

hydropower

wind

photovoltaic

pumped-storage

and electrochemical energy storage. This new model was applied to the Qinghai power grid and achieved an optimized configuration of the system’s capacity of wind

photovoltaic

and pumped-storage.