适用于电力系统稳定分析的冲击式水轮机调节系统动态模型  

Dynamic Models of Pelton Turbine and Speed Governing System Suitable for Power System Stability Analysis

作　　者：孙文涛[1] 刘涤尘[1] 赵洁[1] 唐昱恒 陈刚 洪潮 刘蔚 

机构地区：[1]武汉大学电气工程学院,湖北省武汉市430072 [2]南方电网科学研究院,广东省广州市510080

出　　处：《电网技术》2014年第8期2071-2075,共5页Power System Technology

基　　金：国家自然科学基金项目(51307123);中央高校基本科研业务费专项基金资助(201120702020011);中国博士后科学基金项目(2013M531736)~~

摘　　要：为了研究冲击式水轮机接入电力系统的稳定性,建立了一种冲击式水轮机的数学模型。该模型包括考虑水轮机流量与机械功率非线性关系的水轮机解析非线性模型、引水系统弹性水击模型、喷针开度控制模型、折向器控制模型。仿真计算了其调节特性,与实测结果对比验证了所建立模型的有效性。结合云南电网的暂态过程仿真,分析了不同的冲击式水轮机及调速器模型对电力系统暂态稳定性的影响。结果表明,考虑水轮机流量与机械功率非线性关系和弹性引水系统水击的解析非线性水轮机模型能更有效模拟冲击式水轮机特性。A kind of dynamic mathematical model of Pelton turbine governing system is proposed to research the impacts of grid-connected Pelton turbine generating units on power grid stability. The proposed Pelton turbine and governor model is composed of following parts： an analytical model of Pelton turbine considering the nonlinear relationship between the flow and the mechanical power, the PID governor model of Pelton turbine, the needle servomotor model, the jet deflector and servomotor models and the water diversion system model of Pelton turbine. The control characteristics of the proposed model are simulated, and the comparison of simulation results with experimental results show that the proposed model is effective. Combining with transient process simulation results of Yunnan power grid, the influences of various types of Pelton turbine and governor models on power grid transient stability are analyzed, and the analysis results show that the analytical nonlinear Pelton turbine model, in which the nonlinear relationship between the flow of water turbine and mechanical power as well as the water column traveling wave effects in elastic water diversion system are considered, can simulate the characteristics of Pelton turbine more effectively.

关 键 词：冲击式水轮机 调速器 引水系统 折向器 动态模型 

分 类 号：TM71[电气工程—电力系统及自动化] TM612