三峡-葛洲坝梯级电站两坝间水位优化控制研究及效益分析

Optimized control on water level between Three Gorges dam and Gezhouba dam and its benefit analysis

针对三峡-葛洲坝两坝间水位控制对梯级电站发电量影响的问题,以日为单位,以单台机组为调度单元,建立了基于梯级电站发电精细模拟的三峡-葛洲坝日优化调度模型,运用模型进行大量模拟计算,分析了在三峡水库不同运行水位、不同出库流量下两坝间水位变化对梯级电站发电量影响的规律,得出了最优水位控制表。采用多年平均来流资料进行估算,水位最优控制下梯级电站年多增电量达12亿kW·h。

This paper develops an optimal daily scheduling model of Three Gorges-Gezhouba reservoirs,aiming at the control of river water level between the Three Gorges dam and the Gezhouba dam for a higher cascade power generating capacity.This model is based on an accurate simulation of cascade power generation with a single unit used as the dispatch unit.Through analyzing a large volume of simulation data,relationships are established between the water level change and the generation capacity under different flow releasing conditions of the Three Gorges project,and a chart of optimal water level control is obtained.The simulation results based on the long-term mean runoff show that under the optimal control the cascade power generating capacity totals 106.97 billion kWh or 1.22 billion kWh more than without control.