摘要
针对受下游尾水顶托的水库中长期发电调度中机组出力系数动态变化及其取值问题,从水库的库水位、尾水位和发电流量着手,分析了不同水情下影响综合出力系数的关键因素及其影响程度。结合三峡水电站的小时级运行过程,开展了实例研究。结果表明,旬综合出力系数呈动态变化特点,其年内最大值与最小值相差9.77%(在汛期相差8.71%),且亦存在一定的年际差异(在最小值方面,2017年比2018年大4.44%);进一步分析得知旬综合出力系数在丰水时段取值较小,主要受发电流量影响,尾水位次之,库水位再次,在来水适中或较小的时段取值较大,发电流量为主要影响因素,库水位次之,尾水位再次。
In view of the dynamic variation of unit efficiency coefficient and its value in the middle and long-term power generation dispatching of the reservoir supported by the tailwater downstream,this paper starts with the reservoir water level,tailwater level and power generation flow of the reservoir,the key factors affecting the comprehensive efficiency coefficient under different water conditions and their influences are analyzed.A case study is carried out combined with the hourly operation process of the Three Gorges Hydropower Station.The results show that the ten-day comprehensive efficiency coefficient has a dynamic change,the difference between the maximum and the minimum is9.77%(8.71%in flood season),and there is also a certain inter-annual difference(the minimum in 2017 is 4.44%more than that in 2018).A further analysis shows that the value of ten-day comprehensive efficiency coefficient is smaller in the period of abundant water,the power generation flow is the main influencing factor,the tail water level takes the second place,the reservoir water level ranks lastly,the value is larger in the period of moderate or small discharge,and the power generation flow is the main influencing factor,the reservoir water level takes the second place and the tail water level ranks lastly.
作者
王现勋
齐帅
曾坤
杨旭
姚华明
WANG Xian-xun;QI Shuai;ZENG Kun;YANG Xu;YAO Hua-ming(Hubei Key Laboratory of Petroleum Geochemistry and Environment(Yangtze University),Wuhan 430100,China;China Yangtze Power Co.Ltd.,Yichang 443000,Hubei Province,China;Hubei Key Laboratory of Intelligent Yangtze and Hydroelectric Science,Yichang 443000,Hubei Province,China)
出处
《中国农村水利水电》
北大核心
2022年第2期117-121,127,共6页
China Rural Water and Hydropower
基金
国家自然科学基金联合基金项目重点支持项目(U1865201)
国家自然科学基金面上项目(51979198)。
关键词
水电站
中长期发电调度
变综合出力系数
发电流量
尾水顶托
hydropower station
medium-long term power generation dispatching
variable comprehensive efficiency coefficient
generation discharge
backwater effect
