外文3同步发电机的励磁控制

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1、外文3同步发电机的励磁控制naworldofchange^ewtechnologiesreplaceoldonesever-morequickly.lntheearlyyears,changewasslowastheevolutionaryprocesstransitionedfromelectromechanicalvoltageregulatorswithmotor-drivenrheostatstohigh-gainrotatingexciters.Theseexcitersin-cludedsuchsys

2、temsastheAmplidyne^Regulex^ndRototroLwhichimprovedperformancetocon-trolthegeneratoroutput.lnthepast30years,however,changehasprogressedfrommagnetictechnologytoanalogcontrol.Analogexcitationrepresentedthemultiplecomponentmoduleas-semblywithinterloopingwireinter

3、connections(seeFig.1).Today,weseeanothermajortechnologychange,amovementawayfromanalogcontroltodigitalcontrol.Anexcitationsystemisnowreducedtoasingleintegratedassemblythatincludestheauto-maticvoltageregulator(AVR),fieldcurrentregula-tor(manualcontrol),excitati

4、onlimiters,andevenprotection[3]-[6].Reliabilityisenhancedasmulti-pledevicesareimplementedintothesinglecompo-nentwithmultitaskingmicroprocessors.Fig.2highlightsaclassicdigitalexcitationsysteminter-connectedinageneratorsystem.Asinglecomponentformstheprimaryelem

5、entoftheexcitationsystem.lnputsincludetheinstru-menttransformerforvoltagesensing,currenttransformersignalfromalineCT,andbusvoltagetransformerusedforvoltagematching.Theoutputofthecontrollerisananalogsignaldesignedtoworkdirectlyintoaseparatefiringcircuitthatgen

6、eratespulsesforathree-phase,fullwaverecti-fierbridgetocontrolthefield(seeFig.2).Indigitalsystems,theguidelinesforselectingthepowerpotentialtransformerandrectifierRichardC.SchaeferandKiyongKimarewithBaslerElectricofHighlandJIlinois.BothSchaeferandKimareMembers

7、oflEEE.Thisarticleappearedinitsorigi-nalformatthe2OOOIEEE/IASPulpandPaperCon-ference.1077-2618/01/$10.00?2001IEEEmanytimestomakemodifications.Fig.3(a)isablockdiagramofatypicalanaloglead-lagcontrol-lerutilizedintheautomaticvoltageregulatorcon-trolloop.Thefeedb

8、ackgain(KF)wasadjustedbyapotentiometertoachievestableperformance.Anoptimallytunedexcitationsystemoffersben-efitsinoveralloperatingperformanceduringtran-sientconditionscausedbysystemfaults