尾水管压力脉动对小水电孤网运行的影响  

The Effect of Pressure Fluctuation in Draft Tubes on Small Hydropower Isolated Operation

作　　者：汪炜[1] 张德虎[1] 刘志淼 

机构地区：[1]河海大学能源与电气学院,南京211100 [2]上海勘测设计研究院有限公司,上海200434

出　　处：《中国农村水利水电》2017年第4期197-201,共5页China Rural Water and Hydropower

摘　　要：针对小水电低负荷运行时的尾水管压力脉动现象,建立了考虑尾水管压力脉动的水轮机模型,利用正弦波叠加随机信号的方法模拟脉动情况,分析脉动特性对小水电孤网运行的影响。仿真结果表明:水轮机机械功率和发电机有功功率的波动幅值与压力脉动幅值成正比;压力脉动频率越接近发电机的固有振荡频率,有功功率的波动幅值越大。基于分析,给出抑制尾水管压力脉动影响的方法,为小水电运行提供指导意见。Focusing on the influence of pressure fluctuation in draft tubes when small hydropower run at low load, this paper establishes a hy- draulic turbine model with pressure fluctuation and uses sine wave superimposed random signal to simulate pressure fluctuation. It analyzes the effect of fluctuation characteristics in draft tubes on small hydropower isolated operation. Through numerical experiments, it is found that the turbine mechanical power and active power fluctuation amplitude is proportional to pressure fluctuation amplitude. The pressure fluctuation frequency is closer to the inherent generator oscillation frequency. The active power fluctuation amplitude is larger. Based on the analysis, it offers ways to restrain the influence of pressure fluctuation in draft tubes and provides a guidance for small hydropower operation.

关 键 词：小水电 压力脉动 孤网运行 抑制方法 

分 类 号：TV742[水利工程—水利水电工程]