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外文翻译--异步电动机软启动与转矩控制.doc

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外文翻译--异步电动机软启动与转矩控制.doc

西安文理学院本科毕业设计(论文)第1页SoftStartingofInductionMotorWithTorqueControlAdemirNied,Member,IEEE,JosédeOliveira,RafaeldeFariasCampos,RogérioPinhoDias,andLuizCarlosdeSouzaMarquesAbstractThispaperpresentsasimpletechniquebasedonstatorfluxestimationtocontroltheelectromagnetictorqueofinductionmotorsIMsduringsoftstarting.Theinherentproblemsrelatedtopureintegrationofthebackelectromagneticforcetoestimatethestatorfluxareminimizedusingthelowpassfllterapproach.Theexperimentalresultsaredealtwithandcomparedwiththeusualcurrentcontroltechnique.Theresultsobtainedvalidatetheproposedtechnique,showingitsviabilityinapplicationswheretheobjectiveistofittheIMtorqueprofileduringstartingorstoppingaccordingtotheloadtorque.IndexTermsInductionmotorIM,softstarter,torquecontrol.I.INTRODUCTIONTHEacmotorstartersemployingpowersemiconductorsarebeingincreasinglyusedtoreplaceelectromagneticlinestartersandconventionalreducedvoltagestartersbecauseoftheircontrolledsoftstartingcapabilitywithlimitedstartingcurrent1.Thyristorbasedsoftstartersarecheap,simple,reliable,andoccupylessvolume,andtherefore,theiruseisaviablesolutiontotheinductionmotorIMstartingproblem2.Theangleramptechniqueisknownasthevoltageramptechniquebecauseitdoesnothaveavoltagefeedbackappliedtothemotor.ItmeansthattheIMvoltageiscontrolledthroughafiringanglerampofthethyristorsinanopenloop.Thistechniqueissimple,anditisusedinlowcostcommercialsoftstarters.Itwillalwaysproduceastartingquadratictorquecurvethatcanbeappliedtosmallhydraulicpumpsandsmallfans.Dependingontheinitialswitchinginstantsofallthethreephasestothesupply,anIMmayproduceseverepulsationsontheelectromechanicaltorque,regardlessofwhetheritiscontrolledbyadirectonlinestarterorasoftstarter3.Theelectromagnetictorquepulsationsmaycauseshockstothedrivenequipmentanddamagetomechanicalsystemcomponents,suchasshafts,couplings,andgears,immediatelyPaper2009IDC024.R3,presentedattheIndustryApplicationsSocietyAnnualMeeting,Edmonton,AB,Canada,October5–9,andapprovedforpublicationintheIEEETRANSACTIONSONINDUSTRYAPPLICATIONSbytheIndustrialDrivesCommitteeoftheIEEEIndustryApplicationsSociety.ManuscriptsubmittedforreviewJanuary31,2009andreleasedforpublicationOctober30,2009.FirstpublishedMarch25,2010currentversionpublishedMay19,2010.ThisworkwassupportedbyWEGEquipamentosElétricos.A.Nied,J.deOliveira,andR.deFariasCamposarewiththeDepartmentofElectricalEngineering,UniversidadedoEstadodeSantaCatarina,Joinville89223100,Brazilemail西安文理学院本科毕业设计(论文)第2页dee2anjoinville.udesc.brdee2jojoinville.udesc.brcamposrafaterra.com.br.R.P.DiasiswithWEGEquipamentosElétricos,JaraguádoSul3000,Brazilemailrogeriopdweg.net.L.C.deSouzaMarquesiswiththePowerElectronicsandControlResearchGroup,UniversidadeFederaldeSantaMaria,SantaMaria97105900,Brazilemailmarques_lcsmhotmail.com.DigitalObjectIdentifier10.1109/TIA.2010.2045335ifthestrengthofmaterialsisexceeded,orinthelongterm,owingtofatigue2.NumerousattemptshavebeenmadeontheperformanceanalysisandcontroltechniquesofathreephaseIMfedfromathyristorizedvoltagecontroller4–9.In8,adynamicfunctionwasusedforthethyristortriggeringangleinthevoltagecontrollerprovingtobeasimpleandeffectivewaytoimprovetransientperformance.Therateatwhichthemainfiuxbuildsupisdecreased,andthetransienttorqueissmoothedbyemployingapropertriggeringfunction.In1,somecontrolstrategiesareproposedtoeliminateelectromagnetictorquepulsations,bothatstartingandreclosing,andtokeepthelinecurrentnearlyconstantatapresetvalueovertheentirestartingperiod.Theproposedcurrentcontrolstrategyiscomposedofsuccessivecosinesandconstantfunctionsegmentsofthyristortriggeringangle.In2,theperformanceoftheIMduringvoltagecontrolledsoftstartinghasbeenoptimizedbyeliminatingthesupplyfrequencytorquepulsationsusingapulsatingtorqueeliminationstrategyappliedin10and11,byextendingittocoveralloftheoperatingconditionsofasoftstarter,andbykeepingthelinecurrentconstantatthepresetvalueovertheentiresoftstartingperiod.Thus,in1and2,thetechniqueusedtostarttheIMwithsoftstarterisbasedonthecloseloopcontrolwithcurrentlimitation.Thiscurrentcontroltechniquecanprovideaconstanttorqueduringthebeginningandinthemiddleofthestartingprocess.However,duringthefinalperiodofthisprocess,onecanverifytheexistenceofatorquepulse,inwhich,forcertainkindsofloads,anabruptaccelerationcanbegenerated.Therefore,itseemsthatagoodsolutiontosolvethisproblemistodirectlycontroltheelectromagnetictorqueduringthestartingprocess.Inthispaper,atorquecontroltechniqueisproposedtoeliminatetheelectromagnetictorquepulsationsandtokeepthelinecurrentnearlyconstantatapresetvalueovertheentiresoftstartingperiod.ThisstrategyallowsthetorquetobecontrolledinsuchamannerthataconstanttorqueorevenatailoredtorquecanbefollowedbytheIMduringstartingorstoppingprocess.Theproposedtechnique,besidesmakingthebenefitsobtainedfromthecurrentcontroltechniquepreviouslycitedpossible,alsoallowscancelingthetorquepulseandtheaccelerationverifiedattheendoftheIMstarting.Thecontrol,protection,andmonitoringfunctionsoftheproposedtechniqueareimplementedinamicrocontroller.Theoreticalresultsareverifledexperimentallyusingacustomdesignedexperimental西安文理学院本科毕业设计(论文)第3页setup.Thispaperisorganizedasfollows.SectionIIdescribestheproposedtorquecontroltechniqueandoperationprinciplesNIEDetal.SOFTSTARTINGOFINDUCTIONMOTORWITHTORQUECONTROLFig.1.Proposedcontroltechniqueschematicdiagram.Fig.2.Proposedcontroltechniquedetaileddiagram.SectionIIIshowstheapproachusedtoestimatethefluxfromwhichtheelectromagnetictorquewillbeobtainedSectionIVpresentsexperimentalresultsoftheproposedtechnique,andfinally,conclusionsaregiveninSectionV.II.SYSTEMDESCRIPTIONANDOPERATIONPRINCIPLESTheschematicdiagramoftheIMsoftstarterwiththeproposedtorquecontroltechniqueisgiveninFig.1.TheelectromagnetictorqueestimationisobtainedusingalowpassfilterLPFasthestatorfluxestimatorwhicheliminatestheanaloginputoffset.Theclosedlooptorquecontrolallowsthe西安文理学院本科毕业设计(论文)第4页productionofthedesiredstarttorqueprofilefromtheadoptedreferencetorqueTREF,adjustingtheelectromagnetictorqueTemtotheloadtorque.Fig.2showsadetaileddiagramoftheIMsoftstarterwiththeproposedtorquecontroltechnique.Thisdiagramiscomposedofthreepairsofbacktobackconnectedthyristors,amicrocontrollerbasedcontrolandprotectioncircuitry,firingandanaloginterfacecircuits,synchronism,andhuman–machineinterface.TheanaloginterfacecircuitreceivesthethreelinetolineinputvoltagesignalsVRS,VST,andVTR,thethreelinetolineoutputvoltagesignalsVab,Vbc,andVcaviadifferentialamplifierswithresistivedecades,andthethreelinecurrentsignalsia,ib,andicviacurrenttransformers.Thegenerationofthyristorfiringpulsesisobtainedbyusingthreesignalsthetorquereferencesignal,theestimatedtorquesignal,andtheinputvoltagesynchronismsignals.TABLEIDEFINITIONOFOPERATIONMODESFig.3.Firingsequenceatthebeginningofstartingprocess.

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