水泵水轮机反S特性对甩负荷过程压强的影响  

Influence of reverse S characteristics of pump-turbines on transient pressure during load rejection

作　　者：陈龙[1] 俞晓东[1] 李高会[1,2] 章梦捷 陈胜 张健[1] CHEN Long;YU Xiaodong;LI Gaohui;ZHANG Mengjie;CHEN Sheng;ZHANG Jian(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098;POWERCHINA Huadong Engineering Corporation Limited,Hangzhou 311122)

机构地区：[1]河海大学水利水电学院,南京210098 [2]中国电建集团华东勘测设计研究院有限公司,杭州311122

出　　处：《水力发电学报》2022年第6期112-119,共8页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金项目(51879087,51839008)。

摘　　要：基于长龙山抽水蓄能电站输水发电系统,采用两套不同比转速的水泵水轮机全特性曲线,模拟了电站同时甩负荷工况,结合机组工况点的迁移轨迹,总结了水泵水轮机过渡过程的规律性特征。给出了S特性角的定义,可用于评价水泵水轮机特性曲线反S区域对过渡过程的影响,比较了不同反S形特性曲线对过渡过程参数的影响,验证了给出的S特性角,同时也分析了导致过渡过程参数差异的原因。结果表明,甩负荷过渡过程参数极值均发生在机组飞逸点和零流量点附近的区间,该区域特性曲线的S特性角越小,其压强极值工况点越远离反水泵区,对应时刻的流量更大,流量变化率更小,过渡过程中压强极值得到较大改善。Based on the water transmission and power generation system at the Changlongshan pumped storage station,this article presents numerical simulations of the load rejection condition using two sets of complete characteristic curves with different specific speeds,and summarizes the transient characteristics of pump-turbines by resorting to the unit operating trajectories on these curves.We give a definition of the S characteristic angle,a parameter that can be used for evaluating the influence of the inverse S region of the curves on the transient process.To verify this angle,we compare the influences of different inverse S shapes on the parameters of transient process,and examine the causes of the differences.The results show that for the load rejection of a unit,all the parameter extremes occur in a time interval from its runaway point to zero-flow point.A smaller S characteristic angle of the characteristic curve in this region leads to the pressure extremes farther away from the reverse pump zone,along with larger flows at the extremes and a lower flow change rate,thus lowering the pressure extremes greatly.

关 键 词：水利水电工程 抽水蓄能电站 全特性曲线 水泵水轮机 S特性 过渡过程 

分 类 号：TV743[水利工程—水利水电工程]