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1、IEEETRANSACTIONSONPOWERELECTRONICS,VOL.24,NO.2,FEBRUARY2009445Small-SignalImpedanceMeasurementofPower-Electronics-BasedACPowerSystemsUsingLine-to-LineCurrentInjectionJingHuang,StudentMember,IEEE,KeithA.Corzine,Member,IEEE,andMohamedBelkhayatAbstractNavalshipsaswellasaerospacepowersystemsa
2、rein-areintegratedintoasystem,theirimpedancescanbeusedtocorporatingagreaterdegreeofpowerelectronicswitchingsourcesdeterminetheoverallsystemstability.Forthisreason,extrac-andloads.Althoughthesecomponentsprovideexceptionalperfor-tionofimpedanceisbecomingincreasinglyimportantinmanymance,they
3、arepronetoinstabilityduetotheirhighefficiencyandapplications.constantpowercharacteristicsthatcanexhibitnegativeimpedancenatureatcertainfrequencies.Whendesigningthesesystems,in-Methodsofextractingimpedanceindcsystemshavebeentegratorsmustconsidertheimpedanceversusfrequencyatanin-wellestablis
4、hed[4][10],wherebysmalldisturbancesignalsterface(whichdesignatessourceandload).Stabilitycriteriahaveatvariousfrequenciesareinjectedintothesystem,andthebeendevelopedintermsofsourceandloadimpedancesforbothpertinentcurrentsandvoltagesaremeasuredandprocesseddcandacsystems,anditisoftenhelpfult
5、ohavetechniquesfortoobtainthedesiredimpedanceoradmittanceoverthefre-impedancemeasurement.Fordcsystems,themeasurementtech-niqueshavebeenwellestablished.Thispaperintroducesanewquencyrangeofinterest.Thedisturbanceinjectionmaybeamethodofimpedancemeasurementforthree-phaseacsystems.Byshuntcurre
6、ntoraseriesvoltage.Foracsystems,thetradi-injectinganunbalancedline-to-linecurrentbetweentwolinesoftionalcurrent-injectiontechniquesneedtobeappliedinthetheacsystem,allimpedanceinformationinthetraditionalsyn-synchronousd−qreferenceframe.Recentresearchhasshownchronousreferenceframed−qmodelca
7、nbedetermined.Forthatstabilitycriteriaforacsystemscanbedevelopedbasedonmedium-voltagesystems,theproposedtechniqueissimplerandlesscostlythanhavinganinjectioncircuitforeachphase.Sincethed−qimpedancesofthesourceandload(definedatapartic-thecurrentinjectionisbetweenonlytw
