关键词: 闸门联合调控；防洪调度；高强度调峰调频；“一库多级” 式电站群；大渡河中游

Abstract: With the large - scale construction and grid connection of new energy sources, hydropower faces higher - intensity and more frequent peak - shaving and frequency - modulation tasks. Especially in the "one - reservoir multi - stage" hydropower station group, it is easy to cause unstable water level fluctuations in daily - regulated power stations and forced frequent adjustments of gate openings. The traditional gate operation method based on manual experience cannot meet the requirements of water level regulation accuracy and decision - making efficiency. Therefore, a joint regulation model for the gates of cascade hydropower stations is proposed, which combines "off - line calculation" and "on - line search". First, the feasible gate opening combination schemes at different water levels of each power station are calculated offline, and a general table of cascade gate operation strategies is constructed. Then, according to different regulation objectives such as minimum water abandonment, water level control, water level stability, minimum gate adjustment, and stable outflow, the optimal gate opening combination strategy is searched online. Taking the Pubugou, Shenxigou, Zhentouba, and Shan'an hydropower stations in the middle reaches of the Dadu River as examples, the research shows that on the premise that the Pubugou Hydropower Station, the leading power station, completes the water level control target, the total number of gate operations of the cascade hydropower stations is effectively reduced by 59.1%. The water level fluctuation amplitudes of the three downstream daily - regulated or run - of - river power stations, Shenxigou, Zhentouba, and Shan'an, are reduced by 1.5m, 0.8m, and 1.0m respectively, and the difference coefficient of the outflow of the Zhentouba Hydropower Station is reduced by 0.02. The joint operation of the gates of the cascade hydropower stations in the basin under high - intensity peak - shaving and frequency - modulation is realized, and the safety and scientific level of the dispatching decision - making are improved.

Key words: Joint gate regulation; Flood control operation; High - intensity peak - shaving and frequency - modulation; "One - reservoir multi - stage" power station group; Middle reaches of the Dadu River