回水顶托对长洲水利枢纽发电效益的影响分析

Backwater Impact on the Power Generation Benefit of Changzhou Hydraulic Complex

摘要: 本文采用实测资料和数值模拟相结合的方法，分析桂江来水顶托对长洲水利枢纽发电效益的影响。研究结果表明：枢纽发电出力与桂江来水基本呈负相关性，同一枢纽下泄流量下，水位顶托量、出力损失量与桂江流量呈线性关系。当枢纽下泄满发流量7437 m³/s时，桂江流量每增加100 m³/s，水位顶托量增加超40 mm，出力损失增加约0.21万kW；随着枢纽下泄流量的增大，水位顶托量增幅减小、出力降幅增大；相较于对照方案，桂江流量不超1700 m³/s时，枢纽出力损失小于5%，随着桂江流量的增大，枢纽出力最大损失可超60%。研究成果可为枢纽实际调度运行提供决策支持。

Abstract: This study analyzes the backwater effects of the Guijiang River on the power generation benefit of Changzhou hydropower station by measured data and numerical simulation method. The results show that the power generation of Changzhou hydropower station is basically negatively correlated with the outflow of Guijiang River, on the same discharge of Changzhou hydropower station, the rising water level downstream the dam and the loss of power generation are generally linearly correlated with Guijiang River flow. When the discharge of Changzhou hydropower station is its full-load flow, i.e., 7437 m³/s, the rising water level is more than 40 mm and the power generation reduces by about 2100 kW when the outflow of Guijiang River increases by 100 m³/s. With the increase of the discharge of Changzhou hydropower station, the growth of water level downstream the dam decreases and the degree of decline in the power generation increases. Compared with the basical scheme, when the Guijiang River flow is no more than 1700 m³/s, the loss rate of power generation is less than 5%, and with Guijiang River flow increases, the maximum loss rate of power generation can exceed 60%. The research results can provide decision support for the actual dispatching operation of Changzhou Hy-draulic Complex.