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变速恒频直驱型风电系统低压穿越技术.docx

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变速恒频直驱型风电系统低压穿越技术 Title:LowVoltageRide-ThroughTechniquesforVariableSpeedConstantFrequencyDirectDriveWindPowerSystems Abstract: Withtheincreasingpenetrationofwindpowerintheglobalenergymix,ithasbecomeimperativetoenhancethegridintegrationcapabilityofwindenergyconversionsystems.Thelowvoltageride-through(LVRT)capabilityisacrucialfeatureinensuringthestableandreliableoperationofwindturbinesduringgriddisturbances.ThispaperfocusesontheLVRTtechniquesforvariablespeedconstantfrequencydirectdrive(VS-CFDD)windpowersystems.TheaimistoinvestigatevariousLVRTtechniquesandtheireffectivenessinallowingwindturbinestoremainconnectedtothegridduringabnormalgridvoltageconditions. Introduction: Theintegrationofwindpowerintothegridposesseveralchallenges,oneofwhichistheabilityofwindturbinestoride-throughvoltagedipsandothergriddisturbances.LVRTcapabilityensuresthatwindturbinescanmaintaintheirconnectiontothegrid,thuspreventingcostlyanddisruptivewindpowercurtailment.ThispaperaimstoprovideacomprehensiveoverviewofLVRTtechniquesspecificallydesignedforVS-CFDDwindpowersystems. LVRTTechniques: 1.CrowbarProtection: Crowbarprotectioninvolvesdivertingexcessivefaultcurrentsawayfromcriticalcomponents,suchasthegeneratorandpowerconverter.Thistechniqueeffectivelyreducesstressonthesystemduringgridfaults,allowingthewindturbinetoridethroughvoltagedips.However,crowbarprotectionmayleadtopowerqualityissuesandincreasedthermalstresses. 2.ReactivePowerControl: ControllingthereactivepoweroutputofawindturbinecanenhanceitsLVRTcapability.Byactivelyinjectingorabsorbingreactivepowerintothegrid,thewindturbinecansupportvoltagestabilityduringgriddisturbances.Variouscontrolstrategies,suchasvoltagecontrolandpoweranglecontrol,canbeemployedtoregulatereactivepoweroutputeffectively. 3.EnergyStorageSystems: Integratingenergystoragesystems,suchasbatteriesorsupercapacitors,providesanadditionalsourceofpowerduringgridfaults.Thesesystemscansupplytherequiredreactivepowerandride-throughthevoltagedips,ensuringuninterruptedgridconnection.However