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1、IEEETRANSACTIONSONINDUSTRYAPPLICATIONS,VOL.32,NO.5,SEFTEMBEWOCTOBER19961017CostsandBenefitsofHarmonicCurrentReductionforSwitch-ModePowerSuppliesinaCommercialOfficeBuildingThomasS.Key,SeniorMember,IEEE,andJih-ShengLai,SeniorMember,IEEEAbs&uct-Harmoniccurrentsgenerated
2、bymodernofficecopiers,printers,computers,andotherautomationdevicessaveequipmentcausepowersystemheatingandaddtouserpowertime,reducelaborcosts,andcanprovideasignificantincreasebills.Bylookingattheharmonic-relatedlossesinaspecificinofficeproductivity.Second,manyofthesee
3、lectronicequip-electricalsystem-representingacommercialbuilding-energycostsarequantified.Theanalysisshowsthatbuildingwiringmentareturnedonahighpercentageofthetime,increasinglossesrelatedtopoweringnonlinearelectronicloadequipmenttheoveralldemandfactorandmaximumloadasa
4、percentofmaybemorethandoublethelossesforlinearloadequipment.connectedload.Current-relatedpowerlossessuchas12R,proximityofWhenalltheharmoniccurrentsaretakenintoaccount,theseconductors,an9transformerwindingeddycurrents(I2h2)areelectronicappliancescanhaveaverylowpowerfa
5、ctorinconsidered.Thecostoftheselossesiscomparedtothecostofreducingharmonicsintheequipmentdesign.Resultsshowtermsoftotalwattsholt-amp.Thismeansthatthereismorethatanactive-typeharmonic-eliminationcircuit,builtintothecurrentflowinginthepowersystemthanisrequiredtogetthec
6、ommonelectronicequipmentswitch-mode-powersupply,isjobdone.Theincreasedcurrentcontainsharmonicsandleadscost-effectivebasedonenergylossconsiderationsalone.tohigherwiringlossesperwattofconnectedload.Thispapercalculatesthecostofharmonic-relatedbuildingwiringlossesI.INTRO
7、DUCTIONandcomparesittothecostofabuilt-inharmoniceliminationcircuitdescribedbytheauthorsin[I].ACOMMONsourceofharmoniccurrentsinpowersys-temsiselectronicequipmentthatusesarectifiersup-plyingadc-linkwithstorageorripple-smoothingcapacitors.11.CALCULATINGHARMONIC-RELATEDL
8、OSSESThistypeofelectronicpowersupplyisusedineverythingToday’selectronicequipmenttendstobedistributedinthefromfactoryadjustable-spee
