广州抽水蓄能电站A厂过渡过程仿真计算分析

抽水蓄能电站工作条件复杂多变,工况转换频繁,导致管道压力剧烈变化,机组流动性能严重恶化。机组运行过程中出现的振动问题是影响其安全运行的主要原因,尤其在开、停机以及甩负荷过程中,振动现象尤为明显。本文针对广州抽水蓄能电站A厂已有典型过渡过程工况试验数据,进行了一维过渡过程数值计算,将蜗壳末端压力、转速等特性参数计算结果与试验数据进行了对比分析;同时建立了机组三维全流道模型,采用数值方法计算分析了机组发电工况开、停机过程中,不同时刻对应导叶开度下的轴向水推力,为轴系动力学分析提供了边界条件。

Simulation and analysis of transient process for Guangzhou pumped storage power plant A

The working condition of pumped storage power station is complicated, and its frequent working-mode conversion leads to severe pressure fluctuations in the pipeline and badly-deteriorated flow performances. Vibrations are a significant factor in the safe operation of units, especially more serious at the stages of start-up, shutdown, and load rejection. For the Guangzhou pumped storage power station plant A, we have calculated the variations in pipe pressure using a one-dimensional numerical method, and compared the calculations of pressure at spiral case outlet and rotation speed, etc. with its test data of transient processes in typical conditions. A three-dimensional numerical model was developed and applied to simulations of axial hydraulic thrust at different guide vane openings, focusing on analysis of the start-up and shutdown stages of power generating operation.