宁国抽水蓄能电站可行性研究阶段试验大波动过渡过程计算分析研究

Computational Analysis of Large Fluctuation Transition Process of Ningguo Pumped Storage Power Station in Feasibility Phase

抽水蓄能电站具有启停频繁、一机多用、工况变换多的特点。复杂多变的工况引起的水力瞬变过程,因惯性存在及系统中能量不平衡,将引起水道系统内水压力及机组转速的剧烈变化,即产生压力急剧上升或下降及机组转速急剧加快,危及电站的运行,影响机组的寿命。因此,需进行电站运行中各种工况的过渡过程计算。本文依托可行性研究阶段的宁国抽水蓄能电站,着重进行了大波动过渡过程计算及其敏感性分析,以对系统的稳定性及危险工况进行预测,为输水系统结构布置、机组参数的选择以及导叶关闭规律的优化等提供理论依据。

Pumped storage power station is characterized by frequent start-up and stop,multiple functions of the reversible turbine,and changeful working conditions.Hydraulic transients caused by complex and changeable working conditions,due to the existence of inertia and energy imbalance in the system,will cause drastic changes of pressure and unit speed in waterway system.That is,the pressure rises or falls sharply and the unit speed speeds up sharply,which will endanger the operation of the power station,and affect the life of the unit.Therefore,it is necessary to calculate the hydraulic transient of various conditions during the operation of the power station.This paper studies the hydraulic transient and sensitivity analysis of Ningguo pumped storage power station in feasibility phase,so as to predict the stability and dangerous conditions of the system.The achievements can provide the theoretical basis for the structural layout of water conveyance system,selection of unit parameters,and guide vane closure law.