关键词: 大规模风电并网, 梯级水电站, 反调峰特性, 日发电量, 长期优化调度

Abstract: With new energies developing rapidly, power grids need more regulation capacity under the condition of large-scale wind power grid integration; more cascade hydropower stations start joint operation with large-scale wind power, putting their flexible regulation capacity into use. This paper examines the influence of wind power’s reverse-peak shaving on the generation of such stations, and obtains the upper and lower bounds of their daily generation. Then, we construct a bridge between long-term and short-term dispatching by using these bounds and constraints, considering the short-term shaving characteristics in long-term optimal dispatching. The method is tested in a case study of the cascade hydropower stations in the downstream of Lancang River and the wind power nearby in southwest China. The results show these stations’ long-term dispatching modes need to be adjusted after joint operation with wind power, especially their water storage decisions for the periods before and after flood season, verifying our new approach for large-scale wind power grid integration.

Key words: large-scale wind power grid integration, cascade hydropower stations, reverse-peak shaving characteristics, daily power generation, long-term optimal dispatching