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1、First,introductionanidealelectricalpowersystemisbythesoleconstantfrequencyandthestipulationpeak-to-peakvalueregulatedvoltagepowersupply.Butinfact,asaresultoftherecentyearsalongwithscience'sandtechnology'sunceasingdevelopment,thehighefficiencytradedthecla
2、ssequipmentandthemodulatoruse,highintheelectricalpowersystempressesthenonlinearelementwhichthedirectcurrenttransmissiontheapplication,themassivemisalignmentload'sappearanceaswellasthepowersupplysystemitselfexistedandsoontocauseinthesystem'svoltagewavefor
3、mdistortiontobegettingmoreandmoreserious,hascausedtheverybigharmtotheelectricalpowersystem,forexample:Causesinthepowersupplysystemtheparttoloseincreases,reducescurrentcollector'sservicelife,todisturbthecommunicationsystemandsoon.Seriouswhenevencanalsocau
4、seequipmentthedamage,automaticcontrolmalfunction,relayprotectionmisoperation,thuscreatesthepowercutaccidentandsoonandotherquestions.So-called"thefriendknowsother,isundefeatedinmanybattles",therefore,mustrealizetotheelectricalnetworkovertonecomprehensivep
5、rogramofpublicorder,mustmakecleartheovertoneoriginandtheelectricalnetworkinundertheeachdifferentmovementwaytheovertonetidalcurrentdistributedsituation,adoptsthecorrespondingmeasurelimitandtheharmoniccancellation,thuschangesthefriendlypowersupplysystempow
6、ersupplyqualityandguaranteessystem'ssecurityeconomymovement.Second,electricalpowersystemovertone'soriginintheelectricalpowersystemtheovertonesourceismanyandvaried.Mainlyhasthefollowingseveralkinds:in1,system'seachkindofmisalignmentcurrentcollectorforexam
7、ple:Tradestheclassequipment,themodulator,theelectrificationrailroad,thearcfurnace,fluorescencethelamp,thedomesticelectricappliancesaswellaseachkindofelectronicenergyconservationcontroldeviceandsoonistheelectricalpowersystemovertoneimportantsource.Evenift
8、heseequipmentsuppliesitsidealsinewavevoltage,itusestheelectriccurrentisalsonon-linear,namelyhastheharmoniccurrentexistence.Andthesetheequipmentproducestheharmoniccurrentwillalsopourintotheelectricalpowersystem,willcausesys
