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1、HarmonicsourceidentificationandcurrentseparationindistributionsystemsYongZhaoa，b，JianhuaLia，DaozhiXiaa,*aDepartmentofElectricalEngineeringXi’anJiaotongUniversity,28WestXianningRoad,Xi’an,Shaanxi710049,ChinabFujianElectricPowerDispatchandTelecommunicationCenter,264WusiRoad,Fuzhou,Fujia
2、n,350003,ChinaAbstractToeffectivelydiminishharmonicdistortions,thelocationsofharmonicsourceshavetobeidentifiedandtheircurrentshavetobeseparatedfromthatabsorbedbyconventionallinearloadsconnectedtothesameCCP.Inthispaper,basedontheintrinsicdifferencebetweenlinearandnonlinearloadsintheirV
3、–Icharacteristicsandbyutilizinganewsimplifiedharmonicsourcemodel,anewprincipleforharmonicsourceidentificationandharmoniccurrentseparationisproposed.Byusingthismethod,notonlytheexistenceofharmonicsourcecanbedetermined,butalsothecontributionsoftheharmonicsourceandthelinearloadstoharmoni
4、cvoltagedistortioncanbedistinguished.Thedetailedprocedurebasedonleastsquaresapproximationisgiven.Theeffectivenessoftheapproachisillustratedbytestresultsonacompositeload.2004ElsevierLtd.Allrightsreserved.Keywords:Distributionsystem;Harmonicsourceidentification;Harmoniccurrentseparation
5、;Leastsquaresapproximation1.IntroductionHarmonicdistortionhasexperiencedacontinuousincreaseindistributionsystemsowingtothegrowinguseofnonlinearloads.Manystudieshaveshownthatharmonicsmaycauseseriouseffectsonpowersystems,communicationsystems,andvariousapparatus[1–3].Harmonicvoltagesatea
6、chpointonadistributionnetworkarenotonlydeterminedbytheharmoniccurrentsproducedbyharmonicsources(nonlinearloads),butalsorelatedtoalllinearloads(harmoniccurrentsinks)aswellasthestructureandparametersofthenetwork.Toeffectivelyevaluateanddiminishtheharmonicdistortioninpowersystems,theloca
7、tionsofharmonicsourceshavetobeidentifiedandtheresponsibilityofthedistortioncausedbyrelatedindividualcustomershastobeseparated.Astoharmonicsourceidentification,mostcommonlythenegativeharmonicpowerisconsideredasanessentialevidenceofexistingharmonicsource[4–7].Severalapproachesaimingatev
8、aluat
