【14】滤波器设计举例-MAPE-ID336.ppt
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【14】滤波器设计举例-MAPE-ID336.ppt

【14】滤波器设计举例-MAPE-ID336.ppt

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MeasurementandAnalysisofConductionEMIinSubstationandDesignofPowerFilterAbstractAbstract1Introduction1Introduction1IntroductionInordertoimprovetheelectromagneticimmunityofelectricpowersystemsequipmentsandtheproportionofpassingonlyonceofEMCtest,atthesametime,forthesafetyandreliablerunningofelectricpowersystems,itisveryimportanttoanalyzethetime-frequencybehaviorsoftheEMIsourcesinsubstation,anditisnecessarytostudyhowtoimprovetheEMimmunityabilitiesoftheprotectionandcontrolequipment.EMIisoftenconductedintodepthoftheelectricalinstallationsbypower-lineorearthwire,anditusuallyleadstoequipments’functionsfallingorlosingefficacy.Itisasimpleandeffectivemethodtoemployanti-interferencefiltersinpower-line.Sotheelectricalequipmentscanpasstheconductionandradiationimmunitytest.Today,lotsoffiltersofdifferenttypesandstandardsareproduced,buttheirfunctionsfrequentlycannotmeetthepracticaldemandsoftheprotectionandcontrolequipmentsinelectricpowersystems.Forthisreason,thecharacteristicsoftheEMIsourcesaremeasuredandanalyzedinafewsubstations.Insertionlossesandpropertyimpedancesofseveraltypicalcasesofpowerfiltersaremeasuredandstudiedbyexperiment.Inviewoftime-frequencypropertiesofsubstationEMI,immunitytestshavebeencarriedoutaccordingtotwostandards.Anti-interferencefiltersofbeinggoodfortheelectromagneticworksurroundingsoftheprotectionandcontrolapparatusesaredesignedandresearched.2MeasurementsofEMIandAnalysisofProperty2MeasurementsofEMIandAnalysisofProperty2MeasurementsofEMIandAnalysisofPropertyFig.1timeandfrequencycharacteristicofclosingswitchFig.1timeandfrequencycharacteristicofclosingswitch2MeasurementsofEMIandAnalysisofPropertyFig.2timecharacteristicofopeningshortlineFig.3timecharacteristicofseparatingparentlines2.2PropertyanalysisofsubstationEMI3InsertionLossesTestofPowerFilters3InsertionLossesTestofPowerFiltersFig.4CMinsertionlossesofpowerfiltersFig.5DMinsertionlossesofpowerfiltersInthetwofigures,wecanseethatthelosing-matchfrequencypointofseveralfiltersinsertionlossesisatabout4MHzandthe