双馈风电机组参和微网调频的控制策略-研究

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1、哈尔滨工业大学工程硕士学位论文AbstractBenefitfromthenationalenergystructureadjustment,windpowergenerationdevelopsrapidly.Theinventionofmicrogridhassolvedthegridinterconnectionofsmall-scaledecentralizedwindfarms,improvingtheutilizationofwindpower.Thesystemfrequencyfluctuationhasbeengettin

2、gseriousinmicrogrid,onaccountoftheproportionofwindpowerincreased,especiallyintheislandedmode.Lotsofenergystorageelementsareusedinmicrogridinordertoimprovesystemstability,whichcausestheoperatingcostofmicrogridincreasessignificantly.Inthispaper,throughtheresearchoffrequencyr

3、egulationstrategyofthedoubly-fedinductiongenerator(DFIG)inmicrogrid,thefrequencyregulationcapabilityofDFIGandthestabilityofmicrogridaretriedtoenhanceyetthesystemoperatingcostsisreduced.Firstofall,differentDFIGfrequencyregulationstrategiesareresearchedbasedontheanalysisofDF

4、IGoperatingprinciple,whichfocusesonthecontrolprincipleandfrequencyregulationcapabilitymeanwhilesummariesandcomparisonsarecompleted.Secondly,theproblemoffrequencyseconddropduringfrequencyregulationisresearched.TheDFIGfrequencyregulationprocessisdividedintoactionstageandreco

5、verystagebasedontheamountofDFIGactivepoweroutputthroughtheanalysisofDFIGintegratefrequencyinertiacontroldynamicoperationprocess.AsolutionbyaddingafrequencyseconddropcontrolmoduleisproposedwhichcouldmaketheDFIGactivepowerfallenmovebackward.Theproblemofsystemfrequencysecondd

6、ropissolved,thestabilityofmicrogridisbalanced,thespeedofDFIGrotorisrecoveredandthefrequencyregulationcapabilityoftheintegratedinertialcontrolefficientlyispromotedbythemethodcameupwithinthispaper.Thirdly,theDFIGoperationandcontrolwithdifferentwindspeedsareanalyzed.Asubsecti

7、oncontrolfrequencyregulationstrategywithdifferentwindspeedscombinedtheapplicableconditionsofdifferentDFIGfrequencycontrolstrategiesareproposedcomparingthefrequencycharacterdifferencesbetweenmicrogridandregularpowergrid.Rotorspeedcontrolisusedinmediumwindspeedareas.Integrat

8、edinertialcontrolisusedintheratedwindspeedarea.Short-termoverloadpitchanglecontrolisusedi