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1、First,introductionanidealelectricalpowersystemisbythesoleconstantfrequencyandthestipulationpeak-to-peakvalueregulatedvoltagepowersupply.Butinfact,asaresultoftherecentyearsalongwithscience'sandtechnology'sunceasingdevelopment,thehighefficiencytradedtheclas
2、sequipmentandthemodulatoruse,highintheelectricalpowersystempressesthenonlinearelementwhichthedirectcurrenttransmissiontheapplication,themassivemisalignmentload'sappearanceaswellasthepowersupplysystemitselfexistedandsoontocauseinthesystem'svoltagewaveformd
3、istortiontobegettingmoreandmoreserious,hascausedtheverybigharmtotheelectricalpowersystem,forexample:Causesinthepowersupplysystemtheparttoloseincreases,reducescurrentcollector'sservicelife,todisturbthecommunicationsystemandsoon.Seriouswhenevencanalsocausee
4、quipmentthedamage,automaticcontrolmalfunction,relayprotectionmisoperation,thuscreatesthepowercutaccidentandsoonandotherquestions.So-called"thefriendknowsother,isundefeatedinmanybattles",therefore,mustrealizetotheelectricalnetworkovertonecomprehensiveprogr
5、amofpublicorder,mustmakecleartheovertoneoriginandtheelectricalnetworkinundertheeachdifferentmovementwaytheovertonetidalcurrentdistributedsituation,adoptsthecorrespondingmeasurelimitandtheharmoniccancellation,thuschangesthefriendlypowersupplysystempowersup
6、plyqualityandguaranteessystem'ssecurityeconomymovement.Second,electricalpowersystemovertone'soriginintheelectricalpowersystemtheovertonesourceismanyandvaried.Mainlyhasthefollowingseveralkinds:in1,system'seachkindofmisalignmentcurrentcollectorforexample:Tr
7、adestheclassequipment,themodulator,theelectrificationrailroad,thearcfurnace,fluorescencethelamp,thedomesticelectricappliancesaswellaseachkindofelectronicenergyconservationcontroldeviceandsoonistheelectricalpowersystemovertoneimportantsource.Eveniftheseequ
8、ipmentsuppliesitsidealsinewavevoltage,itusestheelectriccurrentisalsonon-linear,namelyhastheharmoniccurrentexistence.Andthesetheequipmentproducestheharmoniccurrentwillalsopourintotheelectricalpowersystem,willcausesys
