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目前,在一些引水道较长或不太长的多元引水式电站中,运行机组往往出现各种各样的不稳定现象。分析其原因,主要是引水系统的水压流量传递函数应如何确定的问题。如某些设计在分析多元引水式水电站机组稳定时,常用一台机的额定流量来计算水流加速时间常数,而不是用归算方法计算,这就必然造成计算分析与实际情况不符。还有些多元引水式电站,不作机组稳定分析,单凭水流加速时间常数不大于2.5秒的限制条件就认为可行,也是欠妥当的。
At present, in some diversion stations with long or short diversions, operating units often exhibit a variety of instabilities. Analysis of the reasons, mainly water diversion system hydraulic flow transfer function should be how to determine the problem. For example, when some designs are used to analyze the stability of multi-unit diversion hydropower plant, it is common to use a machine’s rated flow rate to calculate the time constant of water flow acceleration, instead of using the reduction method, which inevitably causes the calculation and analysis to be inconsistent with the actual situation. There are also some diversified water-diversion power plants, which are not considered as a stable analysis of a unit and are considered viable only on the basis of a limit of not more than 2.5 seconds for accelerating the water flow time constant.