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1、1078IEEETRANSACTIONSONPOWERSYSTEMS,VOL.18,NO.3,AUGUST2003ContinuationFastDecoupledPowerFlowWithSecantPredictorDilsonA.Alves,LuizC.P.daSilva,CarlosA.Castro,SeniorMember,IEEE,andVivaldoF.daCostaAbstract—TheconventionalNewtonandfastdecoupledpowerfromthevoltagestabilitylimitis
2、crucialtosystemoperators,flowmethodsareconsideredinadequateforobtainingthemax-whichoftenneedtoassessifthesystemhasanewsecureimumloadingpointofpowersystemsduetoill-conditioningprob-andfeasibleoperationpointfollowingagivendisturbance,lemsatandnearthiscriticalpoint.Atthispoin
3、t,theJacobiansuchasatransmissionlineoutageorsuddenchangeinsystemmatrixoftheNewtonmethodbecomessingular.Inaddition,itiswidelyacceptedthattheP–VandQ–decouplingassumptionsloading.Voltagestabilitystaticanalysesofpowersystemscanmadeforthefastdecoupledpowerflowformulationnolonge
4、rhold.beassessedthroughobtainingbusvoltageprofilesasafunctionHowever,inthispaper,itispresentedanewfastdecoupledpoweroftheirloading.Thesevoltageprofilesprovideconsiderableflowthatbecomesadequateforthecomputationofthemaximuminsightintothesystemoperatingconditionsfordifferent
5、loadingpointbysimplyusingthereactivepowerinjectionofase-loadinglevels,andhavebeenusedbytheelectricpowerlectedPVbusasacontinuationparameter.Besides,fastdecou-pledmethodsusingVandasparametersandasecantpredictorindustryforassessingvoltagestabilitymarginsandtheareasarealsopres
6、ented.Thesenewversionsarecomparedtoeachotherpronetovoltagecollapse[2],[3].Amongotherapplications,withthepurposeofpointingouttheirfeatures,aswellasthein-theseprofilesareusedtodeterminingtransferlimitationsfluenceofreactivepowerandtransformertaplimits.Theresultsbetweensendin
7、gandreceivingareasinthetransmissiongrid,obtainedfortheIEEEsystems(14and118buses)showthatthemarginssetting,andcomparingtransmissionplans.Automatedcharacteristicsoftheconventionalmethodareenhancedandtheregionofconvergencearoundthesingularsolutionisenlarged.PFproceduresusingt
8、heconventionalNewtonmethodhavebeenadoptedbymanyelectricpowerutilitiesforcarryingIndexTerm
