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时间:2017-12-08
《具有低电压穿越能力双馈风电场故障特性分析》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、甘m硼:八__J.具有低电压穿越能力的双馈风电场故障特性分析阎智,林雪峰(中国能源建设集团新疆电力设计院有限公司,新疆乌鲁木齐830047)摘要:在机组故障期间转子Crowbar投入不能为电网提供无功支持同时会从电网吸收一定无功从而导致电网运行情况进一步恶化,针对Crowbar保护的弊端提出一种低电压穿越方法,利用DC—Chopper代替Crowbar,同时在故障情况下通过对转子侧变流器进行解耦控制,控制定子侧给电网提供一定无功支持,能更好的实现机组故障穿越。基于此策略在PSCAD平台上搭建了的双馈风电场仿真模型,对比验证了风电场具有低电
2、压穿越能力及控制策略的优越性。在此基础上,分别仿真分析不同故障类型下双馈风电场的故障特性。研究结果表明传统转子Crowbar电路的投入是机组故障电流频率为非工频的原因,而采用其他非转子Crowbar电路的机组故障电流频率为工频;风电场联络线发生任何类型的不对称接地故障,风电场侧都会表现出弱电源特性,单相接地故障表现出的弱电源特性更为明显。这对故障选相元件将会受到严重影响。研究成果具有一定的实际价值和意义。关键词:双馈凤电机组;控制策略;低电压穿越策略;故障特性。中图分类号:TM614文献标志码:B文章编号:1671—9913(2015)0
3、5—0075—06AnalysisofAccidentCharacteristicofDoublyFedWindPowerPlantwithLVRTAbilityYANZhi,LINXue—fengfChinaEneryEngineeringGroupXinjiangElectricPowerDesignInstituteCo.,Ltd,Urumqi830047,China)Abstract:Thedoubly.fedinductiongenerator(DFIG)can’tprovidereactivepowerinsteadofabs
4、orbingitfromthesystemforexcitationwhichcanbringaboutfurtherdeterioration.AimingatthedisadvantagesofCrowbarprotectionpresentsalowvoltageridethroughthemethod,usingDC—ChopperinsteadofCrowbar,atthesametime,incaseoffailurebythedecouplingcontrolofrotorsideconverter,gridsidecont
5、rolofstatortoprovidereactivepowersupport,canbetterrealizetheunitfaultcrossing.DoublyfedinductiongeneratorwindfarmsimulationmodelbuiItinthisstrategybasedonthePSCADplatform,verifythewindfarmhasthesuperiorityoflowvoltageridethroughcapabilityandcontrolstrategy.Onthisbasis,res
6、pectively,simulationanalysisoffaultcharacteristicsofDFIGwindfarmunderdiferentfaulttypes.TheresultsshowthatthetraditionalrotorCrowbarcircuitinputisfa【ultcurrentfrequencyforreasonsofnonpowerfrequency,andtheuseofothernonfaultcurentfrequencyrotorCrowbarcircuitforfrequency;win
7、dfarmtielineofanytypeofasymmetricgroundingfault,thewindfarmsidewillshowaweaksourcefeature,singlephasegroundingfaultperformanceaweaksourcefea~lreismoreobviouS.Thefaultphaseselectioncomponentswil1beseriouslyaffected.Researchfindingshasacertainpracticalvalueandsignificanceof
8、theresearch.KeyWOrds:doublyfedwindpowergenerator;controlstrategy;lowvoltageridethroughstrategy;t
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