长引水系统电站过渡过程数字仿真

The Digital Simulation of Transient Process for Power Station with Long Diversion System

水力过渡过程计算是水电站和水力机组设计不可或缺的一项工作,也是保证电站尤其是长引水系统电站安全稳定运行的前提。为了确保电站甩负荷过渡过程的安全,以有压管道非恒定流微分方程组为基础,采用特征线法,对具有上游调压室,一洞三机布置的复杂引水管路系统建立了数学模型,并进行了机组甩负荷过渡过程仿真计算。最终,确定了合理的导叶关闭规律,给出了相关参数随时间变化的历程线,并计算了调压井的最高、最低涌浪,为该电站的设计及安全稳定运行提供了技术依据,同时对类似工程也具有一定的参考价值。

Hydraulic transient computation plays a main force in design of hydropower station and hydraulic unit,it＇s also precondition of ensuring the secure and stable operation of power station, es-pecially for power station with long diversion system. In order to ensure the safety of load rejection transient process, this paper adopts method of characteristics, builds a mathematical model, and con- ducts simulation computation of transient process aimed at complex water piping system with upstream surge - chamber and one tunnel with three units arrangement, which based on unsteady flow differen- tial equations of pressure pipeline. Finally, it ascertains reasonable closure law, gives the curves of correlation parameters changing with time, calculates the highest and lowest tank surge, provides tech-nical basis for the design and the safe and stable operation of the station, and at the same time, it has a certain reference value for similar engineerings.