三峡-清江梯级电站联合优化调度研究

Unified optimal operation of Three Gorges and Qingjiang cascade hydropower system

本文对以三峡梯级和清江梯级实际组成的混联式水电站群进行联合调度研究，寻求最佳组合调度方式，分别建立了两个梯级单独优化和联合优化调度模型，并利用1951－2002年月均径流资料，采用动态规划逐次逼近优化方法，计算出两个子系统分别及联合调度总的出力过程。分析表明，联合运行使系统保证出力提高48.55万kW，系统不参与调峰时联合运行的多年平均发电量提高1.69亿kW·h，而系统参与调峰联合运行时多年平均发电量提高18.78亿kW·h，效益相当可观。研究还表明，联合运行在提高枯水期发电量、减少弃水电量、提高系统调峰能力、提高执行调度计划合格率以及改善防洪、航运条件等方面同样效益显著。

The thesis researches the combined operation of integrated hydropower system which indudes the Three Gorges cascade stations and the Qingjiang cascade stations. To search the unified optimal operation of the integrated system, single and combined optimal operation models of two cascade stations are established. The dynamic programming with successive approximation model is applied to carry out the computation of individual subsystem optimization and optimization of integrated system. The calculation result based on the monthly runoff data from 1951 to 2002 show that the guaranteed output of the unified optimal operation is higher than the sum of two subsystems by 485.5MW. The annual energy output is elevated by 1.69×10^8kW·h if the subsystems has not been involved in the coordinative operation for adjusting the peak load, but it will be greatly elevated by 18.78×10^8kW·h if the subsystems are involved. The benefit is great. Besides, the benefits including the increase of power output in dry season, reduction of the power loss due to surplus water, as well as the improvement of flood control and navigation condition are also attained.