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时间:2017-12-08
《永磁直驱风电机组故障穿越优化控制策略研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第43卷第24期电力系统保护与控制V_o】.43No.242015年12月16日PowerSystemProtectionandControlDec.16,2015永磁直驱风电机组故障穿越优化控制策略研究王丹,刘崇茹,李庚银(华北电力大学新能源电力系统国家重点实验室,北京102206)摘要:永磁同步发电机构成的直驱型变速恒频风力发电系统通过全功率变流器与电网连接,当电网发生严重故障时,不仅对HVDC设备造成损害,甚至可能影响风力发电系统的整体安全稳定运行。对系统故障期间直流电压失稳的机理进行了分析,基于永磁同步发电机
2、转子的惯性储能特性以及网侧换流器的无功补偿能力,提出一种适用于提高永磁直驱风电机组故障穿越能力的优化控制策略。在网侧故障期间通过分段式转速控制调整风机侧输入的有功并对网侧无功进行补偿,减小了中间直流系统注入的不平衡功率,抑制了故障期间直流电压的骤升。应用PSCAD/EMTDC电磁暂态仿真软件建立单机系统模型,仿真结果验证了所提出的控制策略的有效性。关键词:永磁直驱风电机组;故障穿越;转子储能;分段式转速控制;无功补偿Researchonthefaultride-throughoptimalcontrolstrateg
3、yofPMSG-basedwindturbineWANGDan,LIUChongru,LIGengyin(StateKeyLaboratoryofAlternateElectricalPowerSystemwithRenewableEnergySources,NorthChinaElectricPowerUniversity,Beijing102206,China)Abstract:Thedirectly-drivenvariablespeedconstantfrequencywindpowergenerations
4、ystem,whichconsistsofthepermanentmagnetsynchronousgenerator(PMSG),isconnectedtothegridbyfullsizepowerconverters.WhenseverefaultsOCCuringrid,thefaultswouldnotonlycauseseriousdamagetoHVDCdevices,butalsohaveanadverseimpactonthestableoperationofoverallwindpowergene
5、rationsystem.ThedisabilitymechanismofDCvoltageduringfaultsisanalyzed.BasedontheinertialenergystoragecharacteristicsofPMSGrotorandthereactivepowercompensationcapabilityofgrid-sideconVerter.anovelcoordinatedcontrolstrategyaimedatimprovingthefaultride-throughcapab
6、ilityofPMSGisproposed.InordertodecreasetheimbalancepowerinjectedtotheDC—linkandsuppresstheovervoltageofDC-link,theproposedcontrolstrategyadoptsalloptimalgenerator-sidesegmentedrotorspeedcontrollertoadjusttheactivepowerfromwindturbineandincreasethereactivepowert
7、ogridonthebasisofthegrid-sideconverterwithreactivepoweradjustingcapability.Asingle-machineinfinite-buspowersystemmodelinPSCAD/EMTDCisusedtovalidatetheefectivenessoftheproposedcontrolsystemforimprovingthefaultride-throughcapabilityofPMSG.ThisworkissupportedbyNat
8、ionalNaturalScienceFoundationofChina(No.51190103)and‘‘111”Project(No.B08013).Keywords:permanentmagnetsynchronousgenerator-basedwindturbine;faultride—through;rotorenergystora
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