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1、AnalysisofpowersystemovertoneandovertonetidalcurrenttocalculateFirst,introductionanidealelectricalpowersystemisbythesoleconstantfrequencyandthestipulationpeak-to-peakvalueregulatedvoltagepowersupply.Butinfact,asaresultoftherecentyearsalongwithscience'sandtechnology'sunceasingdevelopment,the
2、highefficiencytradedtheclassequipmentandthemodulatoruse,highintheelectricalpowersystempressesthenonlinearelementwhichthedirectcurrenttransmissiontheapplication,themassivemisalignmentload'sappearanceaswellasthepowersupplysystemitselfexistedandsoontocauseinthesystem'svoltagewaveformdistortion
3、tobegettingmoreandmoreserious,hascausedtheverybigharmtotheelectricalpowersystem,forexample:Causesinthepowersupplysystemtheparttoloseincreases,reducescurrentcollector'sservicelife,todisturbthecommunicationsystemandsoon.Seriouswhenevencanalsocauseequipmentthedamage,automaticcontrolmalfunction
4、,relayprotectionmisoperation,thuscreatesthepowercutaccidentandsoonandotherquestions.So-called"thefriendknowsother,isundefeatedinmanybattles",therefore,mustrealizetotheelectricalnetworkovertonecomprehensiveprogramofpublicorder,mustmakecleartheovertoneoriginandtheelectricalnetworkinundertheea
5、chdifferentmovementwaytheovertonetidalcurrentdistributedsituation,adoptsthecorrespondingmeasurelimitandtheharmoniccancellation,thuschangesthefriendlypowersupplysystempowersupplyqualityandguaranteessystem'ssecurityeconomymovement.Second,electricalpowersystemovertone'soriginintheelectricalpow
6、ersystemtheovertonesourceismanyandvaried.Mainlyhasthefollowingseveralkinds:in1,system'seachkindofmisalignmentcurrentcollectorforexample:Tradestheclassequipment,themodulator,theelectrificationrailroad,thearcfurnace,fluorescencethelamp,thedomesticelectricappliancesaswellaseachkindofelectronic
7、energyconservationcontroldeviceandsoonistheelectricalpowersystemovertoneimportantsource.Eveniftheseequipmentsuppliesitsidealsinewavevoltage,itusestheelectriccurrentisalsonon-linear,namelyhastheharmoniccurrentexistence.Andthesetheequipmentproducestheharmo
