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1、....摘要随着电力工业的迅猛发展，电力系统的互联规模越来越大，电网的运行也越来越接近其稳定极限，这种情况下，互联电网中出现低频振荡的风险大大增加，低频振荡已经成为影响系统动态稳定性及远距离传输容量的重要因素。电力系统低频振荡一旦发生，将会严重威胁着电网的安全运行，造成系统的稳定破坏。因此，对低频振荡的分析与研究已成为国内外电力系统稳定性研究中的重点课题之一。电力系统低频振荡属于系统动态稳定分析的问题。本文将对互联电网低频振荡的问题作以大致的概括和分析。主要从对电力系统低频振荡的定义分类、振荡机
2、理、研究方法及抑制措施等方面着手，建立小扰动分析的经典四机两区域系统，基于Matlab中电力系统分析和控制的工具PSAT对该系统的振荡特征，及负荷、发电机励磁、电力系统稳定器（PSS）等不同的模型对于该系统低频振荡的影响进行分析。关键词：特征分析法，低频振荡，PSAT，电力系统稳定器学习参考....ABSTRACTWiththerapiddevelopmentofpowerindustry,theinterconnectionscaleofthepowersystemismoreandmorel
3、argeandthepowergridoperationhasincreasinglybecomeclosetoitsstabilitylimit.Inthiscase,low-frequencyoscillationiseasytoappearininterconnectedpowergridandhasbecomeanimportantfactoraffectingthesystemdynamicstabilityandlong-distancetransmissioncapacity.As
4、longasthelow-frequencyoscillationhappens,itwillbeaseriousthreattothesafeofthegrid,andcausegreatdamage.Therefore,theanalysisandresearchoflowfrequencyoscillationhasbecomeahottopicofthestudyaboutpowersystemstabilityintheworld.Thestudyoflow-frequencyosci
5、llationbelongstothedynamicstabilityanalysisofpowersystem.Inthispaper,thebasicproblemsoflow-frequencyoscillationsuchasthedefinition,themechanism,researchmethodsandthemeasuresofsuppressionwillbesummarizedandanalyzed.BasedonPSAT,whichisoneofthetoolsofan
6、alysisandcontrolofpowersysteminMatlab,theclassicfourmachineandtworegionalsystemstotheanalysisofsmallperturbationswillbeestablishedtoanalyzetheoscillationcharacteristicsofthissystem.Besides,theaffectionoftheload,generatorexcitation,andpowersystemstabi
7、lizer(PSS)tothelow-frequencyoscillationwillbeanalyzedfurther.KEYWORDS:Eigenvalueanalysis,low-frequencyoscillations,PSAT,powersystemstabilizer学习参考....目录摘要.................................................................................................
8、.......................IABSTRACT................................................................................................................II第1章绪论...................................................................................................
