水轮机详细模型对电力系统暂态稳定分析结果的影响

电力系统仿真研究中常采用简化的理想水轮机模型,水轮机详细模型对于电力系统暂态稳定分析结果的影响尚有待研究.文中介绍了水轮机的三种线性模型和三种非线性模型,包括基于全特性曲线的水轮机模型、水轮机内特性模型、水轮机简化解析非线性模型、基于模型综合特性曲线的水轮机线性化模型、基于水轮机内特性解析的线性化模型、理想水轮机模型.针对不同水轮机详细模型对电力系统暂态稳定分析结果的影响和适用范围进行了仿真比较分析.仿真结果表明不同的水轮机详细模型对电力系统暂态稳定分析结果的影响不大;电力系统的暂态过程对水力系统来说不一定是大扰动;不同的水轮机详细模型得出的电力系统中、长期暂态稳定仿真结果是不同的,因此在进行中、长期暂态稳定仿真分析时应采用水轮机详细模型.

EFFECT OF DETAILED HYDRO TURBINE MODELS ON ANALYSIS RESULTS OF POWER SYSTEM TRANSIENT STABILITY

Simplified ideal models of hydro turbines are applied in power system simulation and the effect of detailed model of hydro turbine on simulation results of power system transient stability remains to be solved. The authors present three kinds of linear models and three kinds of nonlinear models of hydro turbine, including the model based on the four-quadrant characteristics, the model based on the internal characteristics, the simplified analysis nonlinear model, the linearized model based on the mould characteristics, the linearized model based on the internal characteristics, and the ideal model. The effect and the applicability of different detailed models of hydro turbines on power system transient stability are compared and analyzed by use of an example system. The simulation results show that the effect of different detailed models of hydro turbine on power system transient stability is not evident, and the transient process of the power system is not always a large disturbance to the hydraulic system. The simulation results of different detailed models of hydro turbine to medium-term and long-term power system transient stability are different, therefore,the detailed models of hydro turbine should be applied in the medium-term and long-term simulation of power system transient stability.