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ID:34222954
大小:2.78 MB
页数:65页
时间:2019-03-04
《双馈风电机组参与微网调频的控制策略研究》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、哈尔滨工业大学工程硕士学位论文AbstractBenefitfromthenationalenergystructureadjustment,windpowergenerationdevelopsrapidly.Theinventionofmicrogridhassolvedthegridinterconnectionofsmall-scaledecentralizedwindfarms,improvingtheutilizationofwindpower.Thesystemfrequencyfluctua
2、tionhasbeengettingseriousinmicrogrid,onaccountoftheproportionofwindpowerincreased,especiallyintheislandedmode.Lotsofenergystorageelementsareusedinmicrogridinordertoimprovesystemstability,whichcausestheoperatingcostofmicrogridincreasessignificantly.Inthispa
3、per,throughtheresearchoffrequencyregulationstrategyofthedoubly-fedinductiongenerator(DFIG)inmicrogrid,thefrequencyregulationcapabilityofDFIGandthestabilityofmicrogridaretriedtoenhanceyetthesystemoperatingcostsisreduced.Firstofall,differentDFIGfrequencyregu
4、lationstrategiesareresearchedbasedontheanalysisofDFIGoperatingprinciple,whichfocusesonthecontrolprincipleandfrequencyregulationcapabilitymeanwhilesummariesandcomparisonsarecompleted.Secondly,theproblemoffrequencyseconddropduringfrequencyregulationisresearc
5、hed.TheDFIGfrequencyregulationprocessisdividedintoactionstageandrecoverystagebasedontheamountofDFIGactivepoweroutputthroughtheanalysisofDFIGintegratefrequencyinertiacontroldynamicoperationprocess.Asolutionbyaddingafrequencyseconddropcontrolmoduleisproposed
6、whichcouldmaketheDFIGactivepowerfallenmovebackward.Theproblemofsystemfrequencyseconddropissolved,thestabilityofmicrogridisbalanced,thespeedofDFIGrotorisrecoveredandthefrequencyregulationcapabilityoftheintegratedinertialcontrolefficientlyispromotedbythemeth
7、odcameupwithinthispaper.Thirdly,theDFIGoperationandcontrolwithdifferentwindspeedsareanalyzed.AsubsectioncontrolfrequencyregulationstrategywithdifferentwindspeedscombinedtheapplicableconditionsofdifferentDFIGfrequencycontrolstrategiesareproposedcomparingthe
8、frequencycharacterdifferencesbetweenmicrogridandregularpowergrid.Rotorspeedcontrolisusedinmediumwindspeedareas.Integratedinertialcontrolisusedintheratedwindspeedarea.Short-termoverloadpitchanglecontrolisusedi
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