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1、IEEETRANSACTIONSONINDUSTRYAPPLICATIONS,VOL.38,NO.5,SEPTEMBER/OCTOBER20021151ASupercapacitor-BasedEnergy-StorageSystemforElevatorsWithSoftCommutatedInterfaceAlfredRufer,SeniorMember,IEEE,andPhilippeBarrade,Member,IEEEAbstract—Inrecentyears,powervariationsa
2、ndenergycriteriahavebeenthemainmotivationsfordevelopingregenerativedriveconvertersforelevators[1].Abetterperformingsolutionforpowersmoothingcanbeeasilyfoundbyusingasupercapacitor-basedstoragedevice,connectedtotheintermediarycircuitofavariable-speed-drives
3、ystem.Inthispaper,powerandenergyconsiderationsarebeingaccountedforinthedesignofthestoragetankandre-gardingthemaximumpowerdemandfromthefeedingnetwork.Forthepower-conversioncircuit,whichisnecessarytocompen-satethevoltagevariationsofthesupercapacitorsduringc
4、hargeanddischarge,ahigh-efficiencyconvertertopologyisproposed,whichallowsthebidirectionnalenergyflowundersoft-commu-tationconditions.Additionallyitoffersagoodflexibilityfortheoptimalsizingofthesupercapacitorvoltagelevel.Thetypicalbe-haviorofthespecialconv
5、erterisgiven,togetherwithananalysisFig.1.Comparisonofaclassicalelectrochemicalcapacitorandoftheadvantagesrelatedtothespecificapplication.supercapacitor.IndexTerms—Energystorage,loadleveling,medium-frequencytransformers,supercapacitors.I.INTRODUCTIONUPERCA
6、PACITORSrepresentoneofthelatestinnova-Stionsinthefieldofelectricalenergystorage,andwillfindtheirplaceinmanyapplicationswhereenergystoragecanhelptosmoothstrongandshortdurationpowersolicitationsofadis-tributionnetwork.Incomparisonwithconventionalcapacitors,
7、thesenewcomponentsallowamuchhigherenergydensity,to-getherwithahighpowerdensity.Fig.1illustratestheamountofstorableenergyinanelectrochemicaldouble-layer(ECDL)supercapacitorincomparisonwithaconventionalelectrolyticcapacitorofsimilarsize.Eveniftheenergydensi
8、tyisnotcomparabletothatofelectro-chemicalaccumulators,thepossibleamountofstoredenergyandstoragetimearecompatiblewithmanyindustrialrequire-Fig.2.Variablefrequencydriveforelevators.ments.Intransportationsystems,asafir
