用于稳定计算的水轮机调速系统原动机模型

Hydro Turbine Prime Mover Model of Governor System for Power System Stability Computation

水轮机调速系统模型中,水轮机原动机(包括水轮机和过水系统)的强非线性对稳定计算结果有着重要影响。水轮机原动机的主要特点是强非线性以及水击,尤其在导叶开度大于50%的区间,在该区间范围内增大相同的导叶开度导致增加的功率小。通过水轮机原动机理论建模研究,并以现场试验修正理论模型,建立了适用于电力系统稳定计算的水轮机调速系统原动机模型,即"机组导叶开度与出力关系曲线加理想水轮机"的非线性模型;根据水轮机真机与模型机组的相似性,进一步提出了利用水轮机模型综合特性曲线和现场试验得出最大水头和最小水头下该曲线的方法,以满足电力系统稳定计算的不同需要。

In the hydro-turbine governor system model, the strong non-linearity of hydro turbine prime mover, including the hydro turbine and conduit system, has significant impact on the stability computation of the governor system model. The main characteristics of hydro prime mover are non-linearity and water hammer, especially in the region with the gate opening more than 50%, that cause the same increase in gate position to yield less power. A hydro turbine prime mover model of governor system for power system stability computation, i.e., a nonlinear model named servo position VS power output curve plus ideal turbine model is established by deducing the theoretic model of hydro turbine prime mover and modified using the field test results. According to the similarity between the real turbine and the model turbine, by using the hill diagram and doing field test, the curve under the maximum head and minimum head condition can be obtained to meet the different needs of power system stability computation.