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1、http://www.elecfans.comSchaffnerEMVAG电子发烧友Nordstrasse114542LuterbachSwitzerlandhttp://bbs.elecfans.com电子技术论坛T+41326816626F+41326816630www.schaffner.comenergyefficiencyandreliabilityWhitepaperProperselectionofpassiveandactivepowerqualityfiltersforthemitigationofmain
2、sharmonicsAbstractThesteadyincreaseinnon-linearloadsonthepowersupplynetworksuchas,forinstance,variablespeedmotordrives(VSDs),raisesquestionsaboutpowerqualityandreliability.Inthisrespect,agreatdealofattentionhasbeenfocusedonharmonicsastheyoverloadthenetworkinfrastru
3、cture,causereliabilityproblemsonequipmentandsystemlevel,andwasteenergy.Passiveandactiveharmonicfiltersareusedtokeeptheseharmonicproblemsincheck.Theuseofbothactiveandpassivetechnologyisjustified.Thedifficultyisinhowtoselectanddeployharmonicfilterscorrectly,whichiske
4、ytoachievingasatisfactoryperformance.Thispaperexplainswhichspecificationsaresuitablewhenitcomestochoosingactiveandpassiveharmonicfiltersandwhichmistakesneedtobeavoided.AndrzejPietkiewicz,Ph.D.,ProjectManagerInnovationCenterStefanMelly,BusinessDevelopmentManagerDece
5、mber20081/15http://www.elecfans.com电子发烧友http://bbs.elecfans.com电子技术论坛SchaffnerEMVAGWhitepaperRatingofharmonicfiltersDecember,20082/15PowerqualityandharmonicsTheloadexertedbyharmonicsonthepowernetworkinfrastructurehasincreaseddramaticallyoverthepastfewyears.Harmonic
6、currentsarecausedbynon-linearloads.Anon-linearloadisaconsumerofelectricitythatdrawsanon-sinusoidalcurrentfromthesupplynetworkwhensuppliedwithasinusoidalvoltage.Theseharmoniccurrentsflowinadditiontothe“active”sinewave,generateadditionallossesinelectricalinstallation
7、s,andcanresultinthermaloverload.Harmoniccurrentsflowthroughthesystemimpedance,resultinginnon-sinusoidalvoltagedropsthatcancompromisenetworkvoltagequality.Sensitiveloads,suchasmedicaldevicesorITinfrastructure,canhavetheiroperationaffectedifthevoltagesupplyisdistorte
8、d.Measuresforreducingharmonicsareimplementednowadaysinordertoresolvethisissueandcomplywithnationalandinternationalstandardsateverylevelofthenetwo
