导叶关闭规律对大小机组水电站同时甩负荷工况的影响分析  

Analysis of the Influence of Guide Vane Closure Law on the Hydraulic Transition Process of Hydropower Stations with Small and Large Units

作　　者：王鹏[1] 姚雄 陈兰 WANG Peng;YAO Xiong;CHEN Lan(Shaanxi Province Institute of Water Resources and Electric Power Investigation and Design,Xi'an,Shaanxi 710001,China)

机构地区：[1]陕西省水利电力勘测设计研究院,陕西西安710001

出　　处：《水利与建筑工程学报》2024年第5期106-111,共6页Journal of Water Resources and Architectural Engineering

基　　金：陕西省水利科技计划项目“多泥沙河流水轮机抗磨蚀关键技术研究”(2023SLKJ-3)。

摘　　要：针对两台大机组、两台小机组联合布置的一洞四机的水电站,基于特征线法,建立系统的过渡过程模型,模拟系统甩负荷工况,研究分析一段直线关闭规律及两段折线关闭规律对过渡过程的影响。结果表明:一段直线关闭规律时间越长、两段折线关闭第一段关闭时间越长、折点开度越大以及第二段关闭时间越长时,蜗壳最大压力越小,机组最大转速上升率越大;增加转动惯量有利于改善过渡过程参数,可通过调整大(小)机组的转动惯量使大小机组过渡过程极值接近。Based on the characteristic methods,a transient process model of the system was established for a hydropower station with two large units and two small units arranged in one tunnel and four units.The load rejection condition of the system was simulated,and the influence of the Guide vane closing law of one straight line and two broken lines on the transient process was studied and analyzed.The results show that the longer the straight line closing rule time,the longer the first closing time,the longer the break point opening time and the longer the second closing time,the smaller the maximum pressure of the volute and the higher the increase rate of the maximum speed of the unit.Increasing the moment of inertia is beneficial to improve the parameters of transient process,and the extreme values of transition process of large and small units can be made close by adjusting the moment of inertia of large and small units.

关 键 词：水电站 导叶关闭规律 过渡过程 转动惯量 

分 类 号：TV136.1[水利工程—水力学及河流动力学]