摘要
抽水蓄能电站多采用一洞多机的输水系统布置形式,这种布置形式在运行过程中可能会出现控制尾水管进口最小压力的相继甩负荷工况。以福建厦门抽水蓄能电站为例进行计算分析,分别采用考虑摩阻变化及忽略摩阻变化的2种管道模型,计算了上下游岔管位置的改变对蜗壳末端最大内水压力及尾水管进口最小压力的影响;同时,结合抽水蓄能电站蜗壳进口及尾水管进口甩负荷过渡过程的控制指标,优化了岔管的位置。结果表明:岔管位置变化后,由摩阻变化引起的控制指标变化较小,上下游岔管向上游移动均可有效提高尾水管进口最小水压力;而由于岔管位置改变所造成蜗壳进口最大压力变化相较于尾水管进口压力的改变较小。因此,在进行水道系统布置时,可同时将上下游岔管向上游移动,以有效提高尾水管进口的最小压力。
Most of pumped storage power stations adopt a form of one pipe corresponding to several units, which may result in a phenomenon of successive load rejection during the actual operation. Two pipeline models considering the variation of friction and ignoring the variation of friction were developed for Xiamen pumped storage station in Fujian Province to analyze how the change of upstream and downstream bifurcation pipe position affects maximum internal water pressure at the ends of spiral case and minimum pressure at draft tube inlet. And we optimized the bifurcation pipe position based on the control index of load rejection hydraulic transients at the end of spiral case and at draft tube inlet. It is found that the control index changed slightly due to change of friction resistance caused by variation in bifurcation pipe position. Minimum pressure at draft tube inlet could be increased effectively when upstream and downstream bifurcation pipes were moved toward upstream, and maximum internal water pressure at the ends of spiral case had smaller change compared with the pressure at draft tube inlet. Therefore, upstream and downstream bifurcation pipes can be moved toward upstream simultaneously to increase minimum pressure at draft tube inlet in layout of water conveyance system.
作者
张显羽
孙立昌
游秋森
叶永进
樊红刚
ZHANG Xianyu;SUN Lichang;YOU Qiusen;YE Yongjin;FAN Honggang(Fujian Xiamen pumped storage CO.LTD,Xiamen 361000,China;Department Of Energy and Power Engineering,Tsinghua University,Beijing,100084,China)
出处
《人民长江》
北大核心
2019年第11期205-210,共6页
Yangtze River
基金
国家自然科学基金项目(51879140)
关键词
岔管位置
过渡过程
相继甩负荷
甩负荷过渡过程
尾水管进口最小压力
抽水蓄能电站
bifurcation pipe position
hydraulic transients
load rejection
successive load rejection hydraulic transients
minimum pressure at draft
pumped storage station
