原动机周期性扰动引发强迫功率振荡特性研究  

Research on the Properties of Forced Oscillations Caused by Turbine's Periodic Disturbance

作　　者：董超 云雷[2] 刘涤尘[2] 廖清芬[2] 占才亮 汪如松[3] 王强[2] 

机构地区：[1]广东电网公司电力调度控制中心,广东广州510600 [2]武汉大学电气工程学院,湖北武汉430072 [3]中南电力设计院,湖北武汉430072

出　　处：《电网与清洁能源》2012年第4期35-41,46,共8页Power System and Clean Energy

基　　金：国家自然科学基金项目(51077103);中央高校基本科研业务费专项资金资助(201120702020006);武汉大学自主科研项目(5082009)~~

摘　　要：大型水电、火电集中外送系统存在的功率振荡是中国能源外送面临的突出难题,严重限制了外送功率的提升。近年来,实际电网中多次发生强迫功率振荡,前期研究表明,原动机周期性扰动很容易引起电网强迫功率振荡。结合计及原动机调速系统的Phillips-Heffron模型,分析得出共振时扰动源机组的机械负阻尼转矩系数KRE为较大正值;同时进行能量分析,振荡时扰动源机组的势能与非扰动源机组的势能变化呈现明显不同的增长趋势。因此,结合发生强迫功率振荡时各机组的转矩和能量性质,能够实现对原动机周期性扰动类型扰动源的定位。The power oscillation occurring in the large--scaled centralized power transmission system of hydropower and thermal power is a severe challenge in the large-scaled outgoing delivery of electric power in China, substantially limiting the upgrade of the scale of the power to be delivered. In recent years, quite a few forced oscillations have happened to power grids. Previous studies have shown that the turbine＇s periodic disturbance can easily induce the forced oscillation of the power grid. Based on the Phillips-Heffron model, which takes the prime mover speed control system into consideration, the authors of this paper, through analysis, conelude that the mechanical negative damping torgue coefficient K~ should be a positive value of large magnitude if the unit is the disturbance source. Meanwhile, through the energy analysis, it is found that the potential energy of the disturbance source unit presents a growth trend which is distinctly different from that of the non--disturbance source unit. Therefore, the disturbance source of turbine＇s periodic disturbances can be located through analyzing the properties of energy and torque of the generating units when forced oscillations occur .

关 键 词：原动机 强迫振荡 转矩分析 能量分析 扰动源 

分 类 号：TM712[电气工程—电力系统及自动化]