尾水管压力脉动对小水电孤网运行的影响

汪炜 张德虎 刘志淼

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中国农村水利水电 ›› 2017 ›› (4) : 197-201.
水电建设

尾水管压力脉动对小水电孤网运行的影响

  • 汪炜1,张德虎2,刘志淼3
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Effect of pressure fluctuation in draft tubes on small hydropower isolated operation

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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,分析尾水管压力脉动对小水电孤网运行的影响,给出抑制尾水管压力脉动影响的方法。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。

Abstract

Focusing on the influence of pressure fluctuation in draft tubes when small hydropower run at low load, this paper establishes a hydraulic 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’s 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 gives the way to restrain influence of pressure fluctuation in draft tubes and provides guidance for small hydropower operation.

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汪炜 张德虎 刘志淼. 尾水管压力脉动对小水电孤网运行的影响[J].中国农村水利水电, 2017(4): 197-201
. Effect of pressure fluctuation in draft tubes on small hydropower isolated operation[J].China Rural Water and Hydropower, 2017(4): 197-201

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