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一种基于超级电容的变频器电压暂降治理装置 Abstract: Withtherapiddevelopmentofmodernpowerdistributionsystems,voltagesagproblemshavebecomeincreasinglyprominent.Voltagesagcancauseseriousdamagetoelectricalequipment,leadingtoproductionlossesandcompromisingpowerquality.Therefore,itisnecessarytodevelopeffectivevoltagesagmitigationdevices.Thispaperproposesavoltagesagmitigationdevicebasedonsupercapacitorsforvariablefrequencydrives.Thedeviceutilizesthehighenergystorageandfastdischargecharacteristicsofsupercapacitorstoprovideastablevoltagesourceduringsagevents.Theworkingprinciple,designconsiderations,andexperimentalresultsoftheproposeddevicearediscussedindetail.Theresultsdemonstratethatthedeviceeffectivelymitigatesvoltagesagsandimprovespowerquality,makingitapromisingsolutionforvoltagesagmitigationinvariablefrequencydrivesystems. 1.Introduction Voltagesags,alsoknownasvoltagedipsormomentarilylowvoltageevents,areoneofthemostcommonpowerqualityproblemsinpowerdistributionsystems.Theyaretypicallycausedbynetworkfaults,motorstarting,orlargeloadchanges.Voltagesagscanhavesevereconsequencesonelectricalequipment,suchasmalfunctions,productiondowntime,andevenequipmentdamage.Asaresult,voltagesagmitigationhasbecomeacriticalissueinensuringreliablepowersupplyandmaintaininghigh-qualitypowerdistributionsystems. 2.VoltageSagMitigationDevices Severalvoltagesagmitigationdeviceshavebeendevelopedtoaddresstheissue.Thesedevicesgenerallyfallintotwocategories:energystoragedevicesandvoltagecompensationdevices.Energystoragedevices,suchasbatteriesorsupercapacitors,storeenergyduringnormalvoltageconditionsandreleaseitduringsagevents.Voltagecompensationdevices,ontheotherhand,dynamicallycompensatethesagbyinjectingadditionalvoltagetomaintainastablesupply. 3.SupercapacitorsforVoltageSagMitigation Supercapacitors,alsoknownasultracapacitorsorelectricdouble-layercapacitors(EDLCs),havegainedsignificantattentionasapotentialsolutionforvoltagesagmitigation.Theypossessseveraladvantagesoverbatteries,suchasfastchargeanddischargerates,longerlifes

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