红水河龙滩、岩滩梯级水库汛末优化调度策略

Optimal dispatching strategy of Longtan and Yantan cascade reservoirs in Hongshui River at the end of flood season

针对汛末防洪与兴利的矛盾,在分析汛末洪水特性的基础上,考虑梯级水库上下游之间的水力联系,以满足流域防洪安全为前提,提出了"库容高低配"调度模式,通过预泄能力约束和库容补偿调度,建立了基于"库容高低配"策略的水库群汛末蓄水调度模型,制定梯级水库汛末优化调度方案。通过红水河流域龙滩、岩滩水库2017年的汛末优化调度实践得知,龙滩、岩滩水库开展汛末联合优化调度,利用部分库容对中小洪水进行调节,适当抬高水库的汛末运行水位,可以显著提高流域洪水资源化利用效率,充分发挥龙滩、岩滩水电站的综合利用效益,通过汛末优化调度方案在确保流域防洪安全的前提下,可增加发电5.37亿kW·h,减少弃水16.63亿m^3。

Aimed at the contradiction between flood control and beneficial uses, the regulation strategy of high and low collocation of reservoirs storage capacities was proposed based on analysis of the characteristics of inflow at the end of the flood season, and consideration of cascade reservoirs hydraulic connection between upstream and downstream, in order to meet the premise of flood control safety. A regulation model of reservoir storage at the end of the flood season was established based on the strategy, and the optimal scheduling schemes were formulated according to the drainage capacity constraints and capacity compensations. Through the practical application of the optimization dispatching of Longtan and Yantan reservoirs in Hongshui River Basin at the end of the flood season in 2017, it was indicated that the use of partial storage capacity to control the small and medium floods and appropriate raise of the reservoir water levels at the end of the flood season could significantly improve the utilization efficiency of floodwater resources in the basin and give full play to the comprehensive utilization benefits of Longtan and Yantan hydropower stations. According to the practical application in 2017, under the premise of ensuring flood safety in the basin, the operation of the reservoirs with the optimal scheduling schemes increased power generation of 0.537 billion kW·h, and reduced the amount of abandoned water by 1.663 billion m^3.