水轮机尾水管压力脉动对电力系统低频振荡的影响  

Effect of pressure fluctuation in hydraulic turbine draft tube on low-frequency oscillation of electric power system

作　　者：刘志坚[1] 束洪春[2] 王海军[2] 于继来[1] 

机构地区：[1]哈尔滨工业大学电气工程系,黑龙江哈尔滨150051 [2]昆明理工大学电力工程学院,云南昆明650051

出　　处：《水利水电技术》2009年第4期58-61,75,共5页Water Resources and Hydropower Engineering

基　　金：昆明理工大学青年基金(KKZ0200604045);国家自然科学基金资助项目(90610024,50467002,50347026);云南省科技攻关项目(2003GG10);云南省自然科学基金资助项目(2005F0005Z,2004E0020M,2002E0025M)

摘　　要：水轮机尾水管压力脉动是水力发电机组出力摆动的重要原因之一,表现为发电机转子角或输出功率的强迫振荡。尾水管压力脉动主要是由尾水涡带造成的,其频率与水轮机转动频率近似成比例。而且,空蚀会加大脉振的强度。单机无穷大系统中,强迫振荡包括暂态和稳态振荡两部分,暂态分量主要与系统的阻尼有关,而稳态分量则主要与干扰信号有关。建立了水机电一体化仿真模型,通过对部分负荷工况下的仿真,分析了尾水管压力脉动对系统阻尼及振荡特性的影响。The pressure fluctuation in the draft tube of hydraulic turbine is one of the important reasons to lead to the power swing in hydraulic generation unit,which presents as a forced oscillation of rotor angle or output power of generator.The pressure fluctuation in the draft tube is mainly caused by the vortex flow in the draft tube and its frequency is nearly proportional to that of the rotation frequency of the hydraulic turbine.Furthermore,the cavitation could increase the magnitude of pressure fluctuation....

关 键 词：水力系统 尾水管 压力脉动 强迫功率振荡 PRONY分析 

分 类 号：TV734[水利工程—水利水电工程]