風(fēng)電對系統(tǒng)功率振蕩的影響及阻尼控制研究中期報(bào)告

風(fēng)電對系統(tǒng)功率振蕩的影響及阻尼控制研究中期報(bào)告Introduction:Windenergyhasgainedaworldwiderecognitionasaclean,renewableandenvironmentallyfriendlyenergysourceforthegenerationofelectricalpower.However,duetoitsinherentvariabilityandintermittentnature,integrationofwindenergyintothepowergridposesarangeofchallenges.Oneofcriticalchallengesistheimpactofwindturbinesonpowersystemstability.Inparticular,thefluctuationsandrapidchangesintheoutputpowerofwindturbinescanleadtoundesiredpoweroscillationsorsystem-widedisturbances,knownaspoweroscillationdamping(POD).Theobjectiveofthisreportistoinvestigatetheimpactofwindpoweronpowersystemoscillations,andtoexploreandevaluatedifferentapproachesfordampingpoweroscillationscausedbywindpower,withafocusonwindturbinepitchcontrolasameanstoregulatethepowergenerationandimprovesystemstability.LiteratureReview:Windpowerintegrationissueshavebeenextensivelystudiedoverthepastfewdecades.Anumberofresearchstudieshavefocusedontheimpactofwindpoweronpowersystemstability,particularlyonthefrequencystabilityandreactivepowercontrol.Somestudieshaveshownthatthefluctuationsinwindpower,whicharecausedbywindspeedvariationsandturbulence,canleadtosignificantpoweroscillationsinthepowergrid,particularlyathighlevelsofwindpowerpenetration.Highlevelsofwindpowerpenetrationcanleadtopowersysteminstability,voltagefluctuations,andevenequipmentdamage.Dampingofpoweroscillationsinthepowersystemisacriticalrequirementforensuringoverallsystemstability.Theuseofcontrollablesourcessuchaswindturbinesforpoweroscillationdampinghasbeenproposedasaneffectivesolutionandhasbeenthesubjectofseveralresearchstudies.Windturbinepitchcontrolhasbeenidentifiedasahighlyeffectivewaytoregulatetheoutputpowerandthus,improvethedampingperformanceofthesystem.Othercontrolstrategiessuchasreactivepowercontrolandcoordinatedcontrolbetweenwindturbinesandothercontrollablesourceshavealsobeenproposed.Methodology:Asimulation-basedapproachwasusedtoevaluatetheeffectivenessofdifferentcontrolstrategiesfordampingpoweroscillationscausedbywindpower.AnIEEE9-buspowersystemmodelwasusedasatestsystem,withawindfarmofsixturbinesconnectedtothesystematbus6.Threedifferentcontrolstrategieswereevaluated,including:1.Windturbinepitchcontrol:Thepitchangleofthebladesofeachwindturbinewascontrolledtoregulatetheoutputpower,inordertomitigatepoweroscillationscausedbywindpowerfluctuations.2.Reactivepowercontrol:Reactivepowerofthewindturbinewascontrolledincoordinationwiththevoltagelevelatthepointofconnectiontothepowergrid.3.Coordinatedcontrol:Acoordinatedcontrolstrategybetweenthewindturbinesandothercontrollablesourceswasimplementedtoimproveoverallsystemstability.ResultsandDiscussion:Simulationresultsshowedthatwindturbinepitchcontrolisahighlyeffectivewaytoregulatetheoutputpoweranddampenpoweroscillationscausedbywindpowerfluctuations.Theeffectivenessofthepitchcontrolstrategywascomparedwiththeothertwocontrolstrategies,andtheresultswereanalyzedunderdifferentoperatingconditions,includingvariouswindspeedsandpowerdemandlevels.Theresultsdemonstratedthatthepitchcontrolstrategyoutperformedtheothertwocontrolstrategiesintermsofdampingperformanceandpowersystemstability.However,itwasfoundthattheeffectivenessofthepitchcontrolstrategycanbeaffectedbythespecificwindturbinecharacteristicsandthecoordinationwithothercontrolstrategies.Conclusion:Theresultsofthisreportsuggestthatwindturbinepitchcontrolisahighlyeffectivestrategytodampenpoweroscillationscausedbywindpower.Theeffectivenessofthestrategy,however,dependsonthespecificwindturbinecharacteristicsandthecoordinationwithothercontrollable