三阶非线性对主导低频振荡模式的影响  

Effect of Third-order Nonlinearity on Dominant Low-frequency Oscillation Modes of Power System

作　　者：陈武晖[1] 邓集祥[2] 

机构地区：[1]江苏大学电气信息工程学院,江苏镇江212013 [2]东北电力大学电气工程学院,吉林吉林132012

出　　处：《现代电力》2012年第6期27-32,共6页Modern Electric Power

基　　金：国家自然科学基金项目(51277089;51007032);江苏大学高级人才启动项目(11JDG027);江苏省科技支撑计划(BE2011143)

摘　　要：在电力系统动态方程3阶解基础上,分析了3阶非线性对基本模式作用的影响,提出了2阶和3阶非线性对基本模式影响的评价指标,并进一步应用3阶解,提出了识别大干扰主导低频振荡模式的指标,应用Prony算法验证了该指标的有效性。研究结果显示,最靠近虚轴的小干扰主导低频振荡模式,在大干扰情况下可能不被激励或激励较弱,因而大、小干扰主导低频振荡模式可能不同,考虑3阶非线性对大干扰主导低频振荡的影响是必要的。Based on third-order modal series solutions of dynamical equations of power system,the effect of third-order nonlinearity on fundamental modes is investigated.Then,the assessment indexes are proposed to analyze the effects of second-order and third-order nonlinearities on fundamental modes.Furthermore,another analytical index is developed to identify large disturbance dominant low-frequency oscillation modes by applying third-order solutions,and its effectiveness is verified by Prony algorithm.The research results show that the small-disturbance dominant low-frequency mode in a shortest distance to imaginary axes cann＇t or poorly be excited under large disturbance,so the large and small disturbance dominant low-frequency oscillation modes maybe are different,and it is necessary to consider the effect of third-order nonlinearity on large-disturbance dominant low-frequency oscillation modes.

关 键 词：3阶解 主导低频振荡模式 高阶复合模式 非线性 

分 类 号：TM716[电气工程—电力系统及自动化]