【摘要】 本文分析了转桨式水轮机的静特性和动特性特点,计入动态力矩的附加分量、导叶到转轮的流动滞后和管道惯性时间常数（含有流动修正系数x）。因为导水机构位于压力流道的中部且作为水锤界面,故又引入了装置水头升高平均值的概念。还给出了数字例,用频率法验证系统的稳定性。对具有纯滞后的系统,计算所得系统的实际滞后时间τ若小于理论分析得出的临界滞后时间τ_0c,则系统的稳定是保证的。讨论了具有协联装置的双调整调速器在增减负荷时应采取的调节策略问题。最后,提出有待研究的几点建议和某些结论。更多还原

【Abstract】 This paper analyzes the static and dynamic characteristics in Kaplan turbines which involve the following factors: the additional components of the turbine dynamic moment, the water flowing lag effect when the water flows from the guide vane to runner, and the water inertia time constant of water column in the penstock ( Tw1 ) , which should include a correct factor H due to the three dimensional flow in the spiral case. The concept of effective mean instllation head is introduced, considering that the transient pressure distributed along the periphery of the guide vane is nonuniform. In addition, as the hydraulic turbine regulating element is set in the middle position of the water way, the guide vane should act as the interface of the water hammer. By way of a frequency response calculation taking into account the factors mentioned above, a numerical example to check the stability of a hydraulic turbine control system is given. Especially for the system with pure lag, that the system is stable can be insured if the actual lag time τ0 is less than the critical lag time τoc obtained theoretically. The control strategy for the follow-up device of a duplex controller during load variation is further discussed. Finally, some conclusions and suggestions are given.更多还原