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1、MODELLINGOFTHEPOWERSYSTEMOFGOTLANDINPSS/EWITHFOCUSONHVDCLIGHTBild:ABBMartinBraskMasterThesisReportXR-EE-ES2008:006AbstractThepurposewiththisprojectistodevelopamodelofthewholepowersystemofGotlandinthepowersystemsimulationsoftwarePSS/E.Amodelofthewhole
2、powersystemofGotlandhasearlierbeenusedinthepowersystemsimulationsoftwareSimpowbutnowthereisaneedtodevelopamodelinPSS/E.InthepowersystemofGotlandthereareseveralcomponentsthatneedtobemodelledsuchaslines,loads,transformers,shuntimpedances,synchronousmac
3、hines,asynchronousmachines,anHVDCClassiclinkandanHVDCLightlink.ThesecomponentsaremodelledintheSimpowmodelandneedstobeconvertedtothePSS/Emodel.TheaimistodevelopamodelinPSS/EthatisasequalaspossibletothemodelinSimpow.EspeciallytheHVDCLightlinkatGotlandh
4、asbeeninvestigatedintheproject.AproblemwithconvertingdatafromSimpowtoPSS/EisthatthemodelsofseveralcomponentsdifferinSimpowandPSS/E.Linesandshuntimpedancescanbemodelledinthesamewaybutthemodelsforloads,transformers,synchronousmachines,asynchronousmachi
5、nes,theHVDCClassiclink,andtheHVDCLightlinkdifferinSimpowandPSS/E.ThemodelsinSimpowareconvertedtothemodelsinPSS/Einanasequalwayaspossible.TheresultsinPSS/EareanalyzedandcomparedwiththeSimpowmodel.Intheprojectwehavealsomadeatestoffaultsimulationsintime
6、-domainsimulationsinPSS/E.TheaimwiththistestistoverifythePSS/Ecalculationswhenathree-phaseorasingle-phasefaultisapplied.ThereasonforthatisthatPSS/Eonlycalculatesusingpositive-sequencecomponentsandthereforeonlyisabletocalculateexactduringcircumstances
7、ofsymmetricalloadsandfaults.TheresultshowsthatthecalculationsforbothsymmetricalandunsymmetricalfaultsinPSS/Earecorrectconcerningthepositive-sequencecomponents.AdrawbackinPSS/Eis,however,thatwedonothaveanyinformationconcerningthenegative-andzero-seque
8、ncecomponents,whichresultsinthatwecannotcalculatethethreephase-quantities.SammanfattningSyftetmeddettaprojekt?rattutvecklaenmodellavhelaGotlandseln?tisimuleringsprogrammetPSS/E.Tidigareharmananv?ntenmodellavhelaGotlandseln?tisimuleringsprogrammetSimp
