超长引水隧洞上下游双调压室电站水力过渡过程计算研究

Research on Long Diversion Tunnel with Double Surge Chamber Hydraulic Transient Calculation

为研究长引水隧洞水电站的运行稳定性,结合巴基斯坦Neelum Jhelum水电站,建立了封闭管道不定常流动模型,给出了水轮发电机组以及阻抗式调压井的边界条件,优化了机组导叶关闭和启动规律,根据优化结果,进行了过渡过程计算分析,计算表明:选定的机组参数和导叶关闭规律既能满足引水系统在极端工况下甩负荷的要求,也能满足机组负荷调整时转速的稳定性要求,还能满足机组并网后负荷变化时对稳定性的要求,为电站引水系统的设计提供了参考依据,也为电站后期经济、安全优化运行提供了理论依据。

To study the operation stability of long diversion tunnel of hydropower stations, this paper models unsteady flows of closed pipelines based on the Neelum Jhelum Hydropower Station in Pakistan. The model gives boundary conditions of hydroelectric generating set and impedance surge tank, optimizes wicket closure and opening rule, and conducts transition process computation and analysis according to the optimization results. The calculations suggests that the selected unit parameters and wicket closure rule can meet requirements of the water -conduit system rejecting load under extreme conditions, but also meet the stability of rotating speed requirements when the unit makes load adjustment and meets the stability requirements after power grid with load changing. It provides a reference for the design of water-conduit system and a theoretical basis for late economic and safe operation of hydropower stations.