电力系统机电振荡的非线性现象  

Study on Nonlinearity in Power System Electro-Mechanical Oscillation

作　　者：赵雅博[1] 张毅威[1] 陈磊[1] 闵勇[1] 

机构地区：[1]电力系统及发电设备控制和仿真国家重点实验室(清华大学),北京市海淀区100084

出　　处：《电网技术》2012年第10期172-177,共6页Power System Technology

基　　金：国家自然科学基金资助项目(50877042)~~

摘　　要：大型互联电力系统受大、小扰动后,其机电振荡对系统稳定性构成了严重威胁。基于机电振荡的一般性数学描述和线性特征分析法,定义了动态周期、动态衰减速度和非线性度,用于表征非线性系统的机电振荡。在单振荡模式情况下,研讨电力系统非线性特性对响应轨迹的形态和周期的影响,并据此讨论了电力系统的超低频振荡现象;另外,分析了非线性机电振荡的衰减特征,阐明了线性化系统与非线性系统响应在形态和性态上的异同。When a large-scale interconnected power system is disturbed by large or small disturbance,its electro-mechanical oscillations become one of the most important factors affecting the system stability.Based on general description of electro-mechanical oscillation and linear characteristic analysis,dynamic period,dynamic decay speed and nonlinearity are defined to characterize electro-mechanical oscillation occurred in nonlinear system.The influences of power system nonlinear characteristics on both shape and period of response trajectories are researched and on this basis the ultra-low frequency oscillation of power system is discussed;besides,the decay characteristics of nonlinear electro-mechanical oscillation are analyzed,Through the simulations of one oscillation mode,the difference of dynamic responses in a real nonlinear system and its linearized system are comprehensively illustrated and compared,and similarities and differences of responses of linear system and nonlinear system in shapes and properties are expounded.

关 键 词：机电振荡 非线性系统 动态周期 动态衰减速度 非线性度 

分 类 号：TM734[电气工程—电力系统及自动化]