对长压力引水管道水轮发电机组弹性水击稳定域的研究

本文讨论了具有长压力引水管道的水轮发电机组带孤立负荷运行时，机组因事故突然与电力系统解列的情况下，弹性水击对机组稳定边界影响问题，文中推导了调节对象（压力引水管道、水轮机、发电机及其所在电网）与PID调速器组成的调节系统稳定域数学表达式，由于系统数学模型中出现了双曲函数，故采用二次Pade近似，对系统进行了较深入的研究并与原系统特性进行对比，结果表明，利用新的构思所设计的“补偿器”能显著地增大稳定区域，改善其动态品质；指明了对具有长压力引水管道水轮发电机组进行技术更新和技术改造可行途径。

Study on the Stable Region of Elastic Water Hammers in the Long Water Inlet Pipe of A Turbine Generator Set

This paper discusses how the elastic water hammer affects the stable boundary of a turbine generator set with a long water inlet pipe in case the generator set is suddenly disengaged from the electric power system due to some malfunctions when it is running under an isolated load. A mathematical expression of the stable region of a regulative system composed of PID speed regulators and regulated sets is derived in this paper. The quadratic Pade approach is adopted because hyperbolic functions present in the system numerical model, and the system is reformed and compared with its original characters. The research result shows that the stable region of the system can be greatly enlarged and its dynamic quality can be improved by the compensator designed under this new concept. A feasible approach for the technical reformation of a turbine generator set with long water inlet pipes is also presented in this paper.