摘要
基于双机一洞布置型式的抽水蓄能电站输水系统水流动力方程和机组动量方程推导了先甩机组的尾水管进口最小压力解析公式,利用该解析公式分析并推测了尾水管进口压力最小值对应的相继甩负荷最不利间隔时刻点,并基于瞬变流理论和特征线法对某抽水蓄能电站工程实例进行了水力过渡过程数值模拟计算,计算结果验证了该分析和推测的准确性.结果表明:无论是同时甩负荷或是相继甩负荷,尾水管进口最小压力所在的机组运行轨迹点均极靠近机组特性曲线“反S”区间下弯点,且在下弯点以上;当尾水管进口最小压力出现在先甩机组时,对于先甩机组尾水管进口压力而言的最不利相继甩负荷间隔时刻点出现在先甩机组运行轨迹点第一次行至特性曲线“反S”区间Ⅱ区范围内.研究结果为抽水蓄能电站机组尾水管进口压力最小值计算以及控制工况选取提供了参考.
Based on the hydrodynamic and turbine momentum equation of water delivery system in pumped storage power stations with layout of two turbines sharing one main tunnel,the analytical formula for minimum pressure at draft tube inlet of the first rejection turbine was derived.Based on the formula,the most unfavorable interval time of minimum pressure at draft tube inlet in successive load shedding was analyzed and speculated.At the same time,based on the theory of transient flow theory and method of characteristics,numerical simulation calculation of transition process in the engineering example was carried out,which verified the correctness of the analysis and speculation.The results show that the track point of minimum pressure at draft tube inlet is very close to and above the low bending point of inverse S-curve whether in simultaneous or successive load shedding.When minimum pressure at draft tube inlet is in the first rejection turbine,the most unfavorable interval time for it in successive load shedding is in first Zone Ⅱ of the first rejection turbine′s running track.This conclusion provides a reference for the calculation of the minimum inlet pressure of the draft tube of the pumped storage power station unit and the selection of control conditions.
作者
储善鹏
张健
何伟
CHU Shanpeng;ZHANG Jian;HE Wei(Zhejiang Flood Protection Technology Center,Hangzhou,Zhejiang 310000,China;College of Water Conservancy and Hydropo-wer Engineering,Hohai University,Nanjing,Jiangsu 210000,China;Zhejiang Design Institute of Water Conservancy and Hydro-electric Power Co.,Ltd.,Hangzhou,Zhejiang 310000,China)
出处
《排灌机械工程学报》
CSCD
北大核心
2023年第12期1225-1231,共7页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家自然科学基金资助项目(51879087,51839008)。
关键词
抽水蓄能电站
相继甩负荷工况
尾水管进口压力
最不利间隔时刻点
数值模拟
pumped storage power station
successive load shedding condition
draft tube inlet pressure
most unfavorable interval time
numerical simulation
