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《Thesis - On-line voltage stability assessment of power syste》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫(kù)。
1、TampereenteknillinenkorkeakouluJulkaisuja344TampereUniversityofTechnologyPublications344SamiRepoOn-lineVoltageStabilityAssessmentofPowerSystem—AnApproachofBlack-boxModellingTampere2001iABSTRACTThemanagementofpowersystemshasbecomemoredifficultthanearlierbecausepowersystemsareope
2、ratedclosertosecuritylimits,environmentalconstraintsrestricttheexpansionoftransmissionnetwork,theneedforlongdistancepowertransfershasincreasedandfeweroperatorsareengagedinthesupervisionandoperationofpowersystems.Voltageinstabilityhasbecomeamajorconcerninmanypowersystemsandmanyb
3、lackoutshavebeenreported,wherethereasonhasbeenvoltageinstability.On-linevoltagestabilityassessmentiscommonlybasedonablack-boxmodelling.Traditionallythemodelhasbeenatwo-dimensionalsecurityboundary,whichisbasedontabulationofdata.Theideaofthemodel-basedapproachpresentedinthisstudy
4、istogeneralisethesecurityboundarymethodandtotakeintoaccounttheuncertaintyrelatedtopowersystemoperation.Theterm“model-basedapproach”meansinthisthesisanapproachwhichisbasedonblack-boxmodels.Themodel-basedapproachdoesnotreplacetraditionalanalysismethods,ratherthesemethodsareurgent
5、lyneededattheoff-linecomputationstepoftheapproach.Thecomputationofthevoltagestabilitymarginistime-consumingandthatiswhythesemethodscannotbeusedinon-lineapplications.Theobjectiveofthestudywastodevelopamethodtobeapplicableinpracticeforon-linevoltagestabilityassessmentoflong-terml
6、arge-disturbancevoltagestabilitybasedonblack-boxmodel.Thebasisoftheapproachisappropriatemodellingofpowersystemvoltagestabilityandcomputationofthemostcriticalvoltagestabilitymargins.Alargenumberofpowersystemoperationpointsandthemostcriticalvoltagestabilitymarginsarecomputedtocre
7、atethemodel.Anessentialpartofmodelcreationistheselectionandextractionofmodelinputs,onwhichtheaccuracyofthemodelismainlybased.Thisthesisevincesnewideasforon-linevoltagestabilityassessmentofblack-boxmodel.Therequirementsandtheproposedsolutionofallstepsarepresentedtoprovideastepby
8、stepprocedurefortheuse.Thethesisdescribesfirsttimeanap
