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1、MATLAB/Simulink-basedtransientstabilityanalysisofamultimachinepowersystemRamnarayanPatel,T.S.BhattiandD.P.KothariCentreforEnergyStudies,IndianInstituteofTechnology,HauzKhas,NewDelhi,IndiaE-mail:ramnarayan_patel@hotmail.com;tsb@ces.iitd.ernet.in;dkothari@ces.iitd.ernet.inAbstractSimulinkisa
2、dvancedsoftwarebyMathWorksInc.,whichisincreasinglybeingusedasabasicbuildingblockinmanyareasofresearch.Assuch,italsoholdsgreatpotentialintheareaofpowersystemsimulation.Inthispaper,wehavetakenamulti-machinepowersystemexampletodemonstratethefeaturesandscopeofaSimulink-basedmodelfortransientst
3、abilityanalysis.Aself-suf?cientmodelhasbeengivenwithfulldetails,whichcanworkasabasicstructureforanadvancedanddetailedstudy.KeywordsMATLAB;powersystemmodelling;Simulink;transientstabilityThestabilityofpowersystemshasbeenandcontinuestobeofmajorconcerninsystemoperation.Modernelectricalpowersy
4、stemshavegrowntoalargecom-plexityduetoincreasinginterconnections,installationoflargegeneratingunitsandextra-highvoltagetie-linesetc.Transientstabilityistheabilityofthepowersystemtomaintainsynchronismwhensubjectedtoaseveretransientdisturbance,suchasafaultontransmissionfacilities,suddenlosso
5、fgeneration,orlossofalargeload.Thesystemresponsetosuchdisturbancesinvolveslargeexcursionsofgener-atorrotorangles,power?ows,busvoltages,andothersystemvariables.Itisimpor-tantthat,whilesteady-statestabilityisafunctiononlyofoperatingconditions,transientstabilityisafunctionofboththeoperatingco
6、nditionsandthedistur-1bance(s).Thiscomplicatestheanalysisoftransientstabilityconsiderably.Repeatedanalysisisrequiredfordifferentdisturbancesthataretobeconsidered.Inthetran-sientstabilitystudies,frequentlyconsidereddisturbancesaretheshortcircuitsofdifferenttypes.Outofthese,normallythethree-
7、phaseshortcircuitatthegeneratorbusisthemostseveretype,asitcausesmaximumaccelerationoftheconnected2machine.Historically,simulationoftransientphenomenarelatedtopowersystemshasbeen3carriedonusingtheelectromagnetictransientsprogram(EMTP)oroneofitsvari-ants,suchast
