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1、ContingencyRankingforVoltageStabilityAnalysisofLarge-ScalePowerSystemsMajidPoshtan,ParvizRastgoufard,BrijSinghthenoseoftheP-VcurvewithorwithoutapplyingAbstract–Inthispaperweproposeascreeningmethodandcontingenciestothesystem.Anyfailureinthepowersystem,suitablesoftw
2、areprogramtoanalyzecontingenciesandtheirimpactonstaticvoltagestabilityinlargepowersystems.Thesuchaslossoftransmissionlines,generators,ortransformers,programsubstantiallyreducesthenumberofloadflowwillchangethenetworkconfigurationthatinturnwillshrinksimulationforcon
3、tingencyanalysisandvoltagestabilitystudiestheP-Vcurve[9,10]resultinginasmallerMWMfortheandisbasedontheimpactofthecontingencyontheload,andspecificsystemfailures.ForanidealconditionwhenthetheavailableMegaWattMargin(MWM).Theprogramsystemexperiencesnofailureandallofth
4、ecomponentsintheprovidesinitiallyarankingschemeforfirstandsecondlevelsystemareworkingproperly,thesystemiscapableofcontingenciesbycomparingtheirloadabilitywiththemaximumprovidingtheMaximumofMWM,referredtoMMWMinthisloadabilityofthesystem.Itthenmakesashortlistofimpor
5、tantpaper.Inareallarge-scalepowersystem,wenormallycontingenciesfordetailedanalysis.ContingenciesthatresultinaencountermanypossiblecontingenciesanddifferentlargerreductionofmaximumloadabilityareplacedinUnacceptableContingencyCategory,whereas,thecontingenciesconting
6、enciesmayhavedifferentimpactsonthesystempertainingtosmallerreductionareputinAcceptablestabilityandalsoitsloadingmarginMWM[11-13].ThemainContingencyCategory.ThecontingenciesfallinginbetweenreasonforlowvoltageprofileforsomecontingencyandacceptableandUnacceptablecate
7、goriesaretermedasSignificantthereforesmallerMWMistheinsufficientreactivepowerinContingenciesandareplacedinthirdcategory.Theproposedthevicinityofthelowvoltagebuses[14-16].TherearesomemethodistestedfirstbytheIEEE118-busTestSystem,andthenseverecontingencieswithverylo
8、wloadmarginthatareonlyaisappliedtostudyalarge-scalerealpowersystemwith25,000smallfractionofthemaximummargin,whileforsomeotherbuses.Theprogramconsidersth
