Electrochemical parameter identification.pdf

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1、JournalofPowerSources183(2008)55–61ContentslistsavailableatScienceDirectJournalofPowerSourcesjournalhomepage:www.elsevier.com/locate/jpowsourElectrochemicalparameteridentification—AnefficientmethodforfuelcellimpedancecharacterisationMichaelA.Danzer∗,EberhardP.HoferAlbert-Einstein-A

2、llee41,89081Ulm,GermanyarticleinfoabstractArticlehistory:Electrochemicalparameteridentification(EPI)isanovel,application-orientedcharacterisationmethodReceived31January2008forfuelcellimpedances.EPIstrictlyworksinthetimedomain,withamodelofthefuelcellimpedanceReceivedinrevisedform11

3、April2008andmeasurementsoftheexcitationandtheresponseinthetimedomain.ThisapproachreducestheAccepted27April2008measurementtimeconsiderablyincomparisontofrequencydomainmeasurementsforelectrochemicalAvailableonline4May2008impedancespectroscopy.Theuseofasuperimposedsignalassystemexci

4、tationleadstolessinterferenceofthefuelcelloperationthanacurrentinterrupt.ShortmeasurementtimeandlittleinterferenceenableKeywords:anonlineapplicationofthemethodduringtheoperationofthefuelcell.Asimplediscrete-timemodelFuelcelldescribingthedynamicelectricalbehaviourofthefuelcellisde

5、pictedasanequivalentcircuitwhichImpedanceParameteridentificationconsistsofavoltagesourceandtheimpedanceasinternalresistance.ThemodelparametersareidentifiedImpedancespectroscopybyahybridoptimisationalgorithmusingthesampledexcitationandresponsesignals.Acomparisonofmeasuredimpedancesp

6、ectraatvariousoperationconditionswithimpedancemodelsidentifiedbyEPIshowsverygoodagreementoverawidefrequencyrangeandemphasizesthereliabilityofEPI.©2008ElsevierB.V.Allrightsreserved.1.Introductiontotheanalysedsystem,observetheresponse,generateamathe-maticalimpedancemodeloranequivale

7、ntcircuit,andidentifytheForboththedevelopmentandtheoperationoffuelcellsinfor-modelparameters[2].Theimportanceofmodellingasanintegralmationontheelectrochemicalbehaviourandontheinternalstatespartoftheinvestigationisemphasized[3].Generally,themeth-ofthefuelcellstackisneeded.Theopera

8、torasksifthemembraneisodsofcharacterisin