混流式水轮机功率异常波动成因分析  

Analysis of Abnormal Fluctuations of Output Power of Francis Turbine

作　　者：陈晓云 吴广宽 刘胜柱[2] 冯建军 罗兴锜 CHEN Xiaoyun;WU Guangkuan;LIU Shengzhu;FENG Jianjun;LUO Xingqi(Electric Power Research Institute of Yunnan Power Grid Co.,Ltd.,Kunming 650217,Yunnan,China;Zhejiang FINE Institute of Hydraulic Machinery,Hangzhou 311121,Zhejiang,China;Xi’an University of Technology,Xi’an 710048,Shaanxi,China)

机构地区：[1]云南电网有限责任公司电力科学研究院,云南昆明650217 [2]浙江富安水力机械研究所,浙江杭州311121 [3]西安理工大学,陕西西安710048

出　　处：《电网与清洁能源》2020年第2期98-102,109,共6页Power System and Clean Energy

基　　金：国家自然科学基金项目(51679195);陕西省自然科学基础研究计划资助项目(2018JM5102)。

摘　　要：石门坎水电站混流式水轮机组在部分负荷下运行时,机组有功功率波动过大导致该电站无法并网发电。采用SST湍流模型对该电站水轮机在偏工况下的三维不稳定流动进行了仿真计算,重点分析了尾水内部压力脉动特性,研究发现:尾水管空腔涡带振动频率与发电机自振频率发生共振是引起机组有功功率摆动过大的主要原因。When the francis turbine unit of Shimenkan Hydropower Station operates under partial load,the fluctuation of active power of the unit is too large,which makes the power station unable to be connected to the grid.In this paper,the SST turbulence model is used to simulate the unsteady threedimensional turbulence of the Francis turbine under partial load conditions.The characteristics of pressure fluctuation in the draft tube are analyzed.It is found that the resonance of the vibration frequency of the vortex band in the tailrace cavity and the natural vibration frequency of the generator is the main reason for excessive active power swing of the unit.

关 键 词：混流式水轮机 非定常 尾水涡带 压力脉动 

分 类 号：TK733.1[交通运输工程—轮机工程]