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外文翻译--变频器使用浅谈.DOC

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外文翻译--变频器使用浅谈.DOC

河南科技学院机电学院1ThefrequencyconverterisusedanddiscussedlightlyTheasynchronousmotorissuchmainpowerequipmentofmanufacturingenterpriseaselectricity,chemicalindustry,etc..Asthehighenergyconsumptionequipment,itsoutputpowercantbeuptothechangeprorataofload,majoritycanonlyturnonthroughguardorvalvedegreeregulate,buttheenergythatthemotorconsumesdoesnotchangemuch,thuscauseverygreatenergytoloss.Inrecentyears,onethatiswiththematurityoftheproductiontechnologyofthefrequencyconverterandrangeofapplicationoffrequencyconverterisextensivedaybyday,usethefrequencyconvertertocarryontechnologytotransformtothemotorpowerintotheenergyconserving,highefficiencyimportantmeansofeveryenterprise.1.Frequencyconversionadjuststhespeedprinciplen=60f1-s/p1InthetypenRotationalspeedoftheasynchronousmotorfFrequencyoftheasynchronousmotorsThemotoristransferedtothedifferenceratepLogarithmverymuchofthemotor。Canknowbytype1rotationalspeednindirectproportiontofrequencyf,onlyneedchangefrequencyfandchangetherotationalspeedofthemotor,motivepowerfrequencyrealizethatspeedregulate.Thefrequencyconverterismainlyadoptedandhandedinfrankhandoverthesidewhenfrequencyfchangesintherangeof050Hz,therotationalspeedofthemotorregulatestherangeverywidely.Frequencyconversiontransferspeedpasspersonwhochangeselectricity,exchangefrequentlyworkerpowerchangethroughtherectifierintoadirectcurrentsourcefirstjust,thenchangethedirectcurrentsourceintothefrequency,exchangepowercontrollableinvoltageinordertosupplythemotor.Thefrequencyconverteronethereisgenerallyfromrectificationcircuit,河南科技学院机电学院2inthemiddleofdirectcurrentlink,goagainstnotbecomingandcontrollingpartingof4piecesnottomakeup.Rectificationpartthreephasebridgecontrolledrectifier,isitchangesomeintoIGBTthreephasebridgetypegoagainstthengdevicetogoagainst,andoutputforPWMwaveform,middledirectcurrentforstrainwave,directcurrentenergystorageandbufferinactivepowerlink.ThewaveinharmonyissuppressedOutstandingproblemthatfrequencyconverterusewhetherinharmonywaveinterfere,asfrequencyconverterwhenworking,outputinharmonywaveelectriccurrentofelectriccurrentwillleadtothefactinterferingtothepower.Thougheveryfrequencyconverterproducertakemeasuresandreachtofrequencyconverterinharmonyadministrationofwavenationalstandardrequirebasically,questionneedingtopaycloseattentiontomostinbutthewaveinharmonyremainstheselectingtypeofthefrequencyconverteranduses.Containotherwavesinharmonybesidesbasewaveinthevoltageofoutputofthefrequencyconverter.Lowtimesofinharmonywaveusuallyexertagreatinfluenceonelectricalmachineryload,causethetorquetopulse,andhigherwaveinharmonymakesthefrequencyconverterexportleakingtheelectriccurrenttoincreaseofthecableagain,makeelectricalmachineryexertoneselfinsufficient,soleveltimesofinharmonywavethatfrequencyconverteroutputmustsuppress.Becausetherectificationpartofthefrequencyconverteradoptsthecontrolledbridgetyperectificationcircuitofdiode,themiddlestrainwavepartadoptlargeelectriccapacityaswavefilter,sointroductionofrectifierelectriccurrenttochargeelectriccurrentcondenserinfact,itisasteeperpulsewave,itswaveinharmonyisrelativelylargeinweight.Inordertodispelthewaveinharmony,adoptthefollowingcountermeasuremainlya.Increasefrequencyconvertersupplypowerpowerimpedancegenerally,interiorimpedance,powerofequipmentcanisitbufferfrequencyconverterdirectcurrentstrainfunctionofinactivepower,waveofelectriccapacitytoplay.Impedanceisshortcircuitimpedanceofthevoltagetransformerinthiskind.Look河南科技学院机电学院3onpowercapacityrelativecapacitylittlefrequencyconverteras,interiorimpedancevaluerelativeandheavy,thelessthecontentofwaveinharmonyisTherelativefrequencyconverterofcapacityofthepoweristhelargerincapacity,impedancevalueisrelativelow,thelargerthecontentofwaveinharmonyis.Choosefrequencyconverteratsupplyingpowerpowertransformering,hadbetterisitshortoutimpedanceheavyvoltagetransformertochoose.b.Installreactorinstallreactortoincreasefromoutsidefrequencyconvertersupplypowerinteriorimpedanceofpoweractually.Installsthereactororinstallsatthesametimeontheexchangesideofthefrequencyconverterorthedirectcurrentsideofthefrequencyconverter,cansuppresstheelectriccurrentofwaveinharmony.c.Therectificationpartofthefrequencyconverteris6pulsewaverectifiersthatthevoltagetransformerusuallyoperatesheterogeneously,sothewaveinharmonyproducedisrelativelybig.Useheterogeneousoperationofvoltagetransformer,suchasmakephaseplacecornerbadYof30°eachotherY-△、△-△2voltagetransformersmadeupareformedandequivalentto12pulsewaverectifiers,canreducetheelectriccurrentofwaveinharmony,playagoingtothewaveinharmonytosuppressrole.d.RegulateyearofthefrequencyconverterBobImproveBobinyearofthefrequencyconverter,cansuppresswaveinharmonyonceeffectivelylow.e.UsethewavefilterWavefiltercanmeasurefrequencyconverterinharmonywaveamplitudeandphaseplaceofelectriccurrent,producetheelectriccurrentcontrarytoelectriccurrentphaseplacethesameinamplitudeofwaveinharmony,thusabsorbeffectively.3.Matchofload3.1SquaretorqueloadAirblower,,pumploadwhetherindustryuseequipmentmostlive,frequencyconverteratmostapplicationattheload.Itplantssquaretorqueload.Generallyspeaking,haveU/fConstcontrolfrequencyconverterofmodecanmeetthe河南科技学院机电学院4demandofloadbasically,belowfoundationthemaincharacteristicquestionthatneednoticewhenintroducingpersonningwhoselectoffrequencyconverter.3.1.1HaveavoidedloadingAirblowerdifficultoverloadaswaterpump,guaranteeitgreaterthanormeanthecapacityofthemotorslightlyatthecapacitytochoosefrequencyconverterOverloadcapacityoffrequencyconverterthatchooseatthesametimerequiretobelowereven,upto120generally,1min.Butshouldnoticewhenthefunctionparameterofthefrequencyconverterischosenandpresetted,becausetheloadonehindersthetorqueindirectproportiontothesquareofrotationalspeed,whentheoperatingfrequencyishigherthanthespecifiedfrequencyofthemotor,tohindertorquecanexceedthespecifiedtorqueload,overfreightmotor.Soisitcontrolsupremeoperatingfrequencycanexceedthespecifiedfrequencyoftheelectricalmachinerystrictlytowant.3.1.2Matchthatthefrequencyconverteracceleratestimeandmoderatestimewhileopening/stoppingBecauseairblowerandloadofpumprotateinertiatobeheavy,itstartandwhenstoppingwithtoacceleratetimeandmoderatetimeitmatchestobeoneimportantproblemveryfrequencyconverter.Personwhoselectwhenusing,shouldcalculatetoacceleratetimeandmoderateaccordingtoloadparametertimechooseshorttimemostfrequencyconverterinfrequencyconverter,inordertotakeplacesituationthatvoltagetripwhenthefrequencyconverterhasnotflowedtotripwhilestartingandthefrequencyconverterismoderated.Butintheproductiontechnologysometimes,demandtobeverystricttothestartuptimeofairblowerandpump,ifabovementionedtimethatcalculatecanatmeetingdemanding,shouldredesigntheselectingtypetothefrequencyconverter.3.1.3AvoidtheresonanceBecausefrequencyconverterthroughchangepowerfrequencyofmotorisitchangeelectricalmachineryrotationalspeedrealizeenergyconservingresulttocome,possibleunderacertainelectricalmachineryrotationalspeedandloadsome

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