design of auxiliary power supply in pitch controller

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1、20092ndInternationalConferenceonPowerElectronicsandIntelligentTransportationSystemDesignofAuxiliaryPowerSupplyinPitchControllerofLarge-ScaleWindTurbineJianqiangWang,MinmingGongDept.ofElectricalEngineeringBeijingJiaotongUniversityBeijing,ChinaAbstract-Pi

2、tchcontrollerisaveryimportantcontrollerinbetweeninputandoutput;verywideinputvoltage;andproperlarge-scalewindturbine.Itspowerusuallycomesfromtheinnerprotection.three-phaseacbusofthewindturbine.However,theacbusvoltageisoftenhigherthan400V,whichisfarbeyond

3、theII.MAINCIRCUITDESIGNnecessaryvoltageofthepitchcontroller.Therefore,thepitchA.TopologySelectioncontrollermusthaveitsownauxiliarypowersupplytooperatenormally.ThispaperdiscussesahighvoltageflybackconverterAccordingtotherequirementsofsuchauxiliarypoweras

4、suchauxiliarypowersupply.Thetransformerinthisconvertersupplyforpitchcontroller,theflybacktopologyisalmostaiswithhighvoltagetransferratioandwiththespecialphysicaluniquechoice[2.Sl.Thereasonsare:structuraldesigntoreducetheleakageinductance.Togreatlyimprov

5、ethecross-regulationcapabilityoftheoutputs,multiple1.Transformerisolationisneededfrominputtooutputinoutputsensingtechnologyinvoltagefeedbackloopisusedhere.thisdesignforelectricalinsulation.Inaddition,thispaperalsodiscussesthedesignofprotection2.Thereisv

6、erywideandhighinputvoltageappearsacrosscircuitandtransformerprimarysnubbercircuit.Thetheprimarywindingofthetransformer.experimentalresultsofaprototypewiththreeoutputsverifythepracticabilityofthisdesign.3.Thetotalpoweroftheflybackconverterissmallandthere

7、islittlepeakcurrentthroughthepowerswitchesbecauseIndexTerms-flybackconverter,transformer,currentmodeofhighinputvoltage.control,pitchcontroller,windturbineFig.1illustratesthebasictopologyoftheflybackconverter.1.INTRODUCTIONThereisasnubbercircuitandself-p

8、oweredcircuitatprimaryPitchcontrolisthemostcommonmeansofcontrollingthesideofthetransformer.aerodynamicpowergeneratedbytheturbinerotor.Pitchcontrolalsohasamajoreffectonalltheaerodynamicloadsgeneratedbytherotor.Theprimaryobjectiveo