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双馈风电场并网对送出线路继电保护的影响及改善措施.docx

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双馈风电场并网对送出线路继电保护的影响及改善措施 Abstract Theintegrationofdoubly-fedwindfarmsintothepowergridcanhaveasignificantimpactonthetransmissionlinerelayprotection.Transmissionlinerelayprotectionisanessentialcomponentofthepowersystemandisresponsibleforisolatingfaultycircuitstopreventfurtherdamage,therebymaintainingthereliabilityandsafetyofthepowersystem.Thispaperdiscussestheimpactofdoubly-fedwindfarmsontransmissionlinerelayprotectionandproposesvariouscorrectivemeasurestoimprovetheperformanceofthesystem. Introduction Theintegrationofrenewableenergysourcesintothepowergridhassignificantlyincreasedinrecentyears.Amongtheseresources,windpowerisplayingasignificantroleinthetransitiontowardsagreenerandsustainablefuture.Inthewindpowersector,doubly-fedinductiongenerators(DFIG)arewidelyusedinlarge-scalewindfarmsduetotheirhighefficiencyandcost-effectiveness.However,theintegrationofthesewindfarmscanhaveasignificantimpactontheconventionalpowersystem,particularlyonthetransmissionlinerelayprotection. Transmissionlinerelayprotectionisacriticalcomponentofthepowersystemthatisresponsiblefordetectingandisolatingfaultycircuitstopreventfurtherdamage,therebymaintainingthereliabilityandsafetyofthesystem.Therelayprotectionsystemoperatesbasedonthevoltageandcurrentsignalsofthetransmissionline.Thesesignalsareusedtodetectfaultconditionsandtransmitsignalstothebreakertoisolatethefaultycircuit.However,theintegrationofwindfarms,particularlydoubly-fedwindfarms,cansignificantlyaffectthefaultdetectionsignals,leadingtofalsetrippingordelayedtrippingofthetransmissionlineprotectionsystem. ImpactofDoubly-FedWindFarmsonTransmissionLineRelayProtection Theintegrationofdoubly-fedwindfarmscanhavevariousimpactsonthetransmissionlinerelayprotection.Theseincludethefollowing: 1.Variationsinvoltageandcurrentsignals:TheoutputvoltageandcurrentofDFIGsaresinusoidalsignalsbutarenotin-phasewiththegridvoltagesignals.Thiscancausevariationsinthevoltageandcurrentsignalsofthetransmissionline,leadingtofalsetrippingordelayedtrippingoftheprotections