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1、1497DirectStabilityAnalysisofElectricPowerSystemsUsingEnergyFunctions:Theory,Applications,andPerspectiveHSIAO-DONGCHIANG,SENIORMEMBER,IEEE,CHIA-CHICHU,STUDENTMEMBER,IEEE,ANDGERRYCAULEY,SENIORMEMBER,IEEEInvitedPaperStabilityanalysisprogramsareaprimarytoolusedbypowerandloaddisturbances.Event
2、disturbancesincludegeneratorsystemplanningandoperatingengineerstopredicttheresponseoutages,short-circuitscausedbylightningorotherfaultofthesystemtovariousdisturbances.Importantconclusionsandconditions,suddenlargeloadchanges,oracombinationofdecisionsaremadebasedontheresultsofstabilitystudie
3、s.Thesuchevents.Eventdisturbancesusuallyleadtoachangeinconventionalmethodofanalyzingstabilityistocalculatethetransientbehaviorofgeneratorsduetoagivendisturbance.Bytheconfigurationofthepowersystem.Loaddisturbances,examiningthebehaviorofgenerators,onedetermineswhetherontheotherhand,arethesma
4、llrandomfluctuationsinstabilityhasbeenmaintainedorlost.Incontrast,directmethodsloaddemands.Thesystemconfigurationusuallyremainsofstabilityanalysisidentifiwhetherornotthesystemwillremainunchangedafterloaddisturbances.Recenttrendstowardstableoncethedisturbanceisremovedbycomparingitwithafullu
5、tilizationofexistinggenerationandtransmissionsys-calculatedthresholdvalue.Directmethodsnotonlyavoidthetime-consumingsolutionsrequiredintheconventionalmethod,butalsotemshaveincreasedtheeffectsofthesedisturbancesonprovideaquantitativemeasureofthedegreeofsystemstability.powersystemsecurity.Th
6、isadditionalinformationmakesdirectmethodsveryattractivePowersystemsareplannedandoperatedtowithstandwhentherelativestabilityofdifferentplansmustbecomparedortheoccurrenceofcertaindisturbances.TheNorthAmericanwhenstabilitylimitsmustbecalculatedquickly.Thispaperpresentsatheoreticalfoundationof
7、directmethodsElectricReliabilityCouncildefinessecurityasthepreven-forbothnetwork-reductionandnetwork-preservingpowersystemtionofcascadingoutageswhenthebulkpowersupplyismodels.Inadditiontoanoverview,newresultsareoffered.Asubjectedtoseveredisturbances.Thespecifi