山东大学博士学位论文
ABSTRACT
Withimplementationofthe‘'transmissionofelectricityfromthewesterntotheeasternregion”strategy,twobigandlong—chainACsynchronizedpowergridshavebeenformedinourcountryaccordingtoaseriesofinterconnectionprojects.Recently,‘'ultra-high—voltagefOHV)gridas
strategicalthebackbonegrid,coordinateddevelopmentofpowergridsatalllevels’’objectivehasbeenproposedbyStateGridCorporationofChina(SGCC).OnJanuary6,2009,the1000kVJindongnan-Nanyang-JingmenUHVACexperimentalpilotproject,which
hasbeenisresearched,developed,designedandconstructedindependentlybyChina,formallycompletedandputintooperation.Accordingtoplanning,‘'twoverticaltwohorizontal”UHVbackbonegridwill.beconstructedandanultra-large—scaleNorthChina—CentralChina EastChinaIⅢACsynchronizedpowergridwillbeformedbythebeginningofthe“TwelfthFive—Year’’.Bytheyeararound2020,astrongstructurewillbeformedforUHVpowergridofSGCC,whichtakestheNorthChina,CentralChinaandEastChinaasthe
hydropowerbases
Duringcore,andandmainoflinksmajorregionalpowergrids,largecoalbases.andlargeloadcenters.constructionOurcountry’Sultra-highvoltage(UHV)powergrid,both
tolowelectromagneticloopcircuitandstressedlongUHVtransmissionpassagemaylead
frequencypoweroscillation.Largescalepowersystemhasacharacteristicoflargescaleand
andvariableoperationcondition.Bothofthemchallengeexistinglowfrequencyanalysisoncontrolmethods.Therefore,studieslowfrequency
toanalysisandwide—areaadaptiveofexistingcontrolforlargepowersystem,whichisusedovercome
ashortcomingsanalysisandcontrolmethodsinpracticalapplications,hasgreatimportanceinenrichment
andextensionofpowersystemlowfrequencyoscillationanalysisand
betweencontroltheory,regionalpower
controlmethod
onpreventionblackoutandimprovementtransmissiononcapacitysystems.Basedononliteraturereviewofstudiesmechanism,analysisandsmalldisturbanceanglestability,thoroughstudiesandusefuldiscussions
adaptivecontrolstrategiesforlargelowfrequencyanalysismethodandwide—areapowersystem
havebeenmadeinthisdissertation.Themainresearchworkandinnovativefruitsareasfollows.
1)wm
onlyregardsortolimitationofconventionaleigenvaluesmallscaleanalysismethodholdstrueformiddlepowersystem,apracticalmethodforlargescaleinterconnected
IVpowersystemlowfrequencyoscillationanalysisisproposedbycombing
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