下迷宫压力脉动对抽水蓄能机组稳定性的影响分析

水泵水轮机组的运行稳定性对抽水蓄能电站的安全高效运行至关重要。对广蓄A厂抽水蓄能机组发电工况进行了稳定性试验,深入分析了各工况下迷宫压力脉动、顶盖振动和水导轴承摆度信号之间的关系。结果表明:转频、转轮叶片通过频率及尾水管内的低频旋转涡带是引起下迷宫压力脉动的关键频率;下迷宫压力脉动信号与顶盖振动、水导轴承摆度信号高度相干,对抽水蓄能机组水平和垂直两个方向的振摆都有重要影响。

Influence Analysis of Lower Labyrinth Pressure Pulsation for Stability of Pumped-storage Unit

Pumped storage power station was widely concerned since its important role. The running stability of the pump turbine unit as the core component was essential to the safe and stable operation of the plant. The stability tests were conducted under working condition of hydroelectric generating set. The test data were analyzed, including the lower labyrinth pressure pulsation, the guide bearing swing and the head cover vibration. It was revealed that the main frequency causing the labyrinth pressure pulsation was the rotation frequency, the blade passing frequency of runner and the vortex rope of draft tube. The signals of labyrinth pressure fluctuation were strong correlated with the signals of the turbine bearing swing and the head cover vibration and had a strong influence on the vertical/horizontal vibration and swing of turbine.