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1、IEEETRANSACTIONSONPOWERSYSTEMS,VOL.20,NO.4,NOVEMBER20051929Wind-TurbineFaultRide-ThroughEnhancementAlanMullane,Member,IEEE,GordonLightbody,andR.YacaminiAbstract—Faultride-throughspecificationslistedinmoderntransmissionanddistributiongridcodesspecifythatw
2、ind-turbinegenerators(WTGs)mustremainconnectedtoelectricitynetworksatvoltagelevelswellbelownominal.Achievingreliableoperationatgreatlyreducedvoltagelevelsisprovingproblematic.Apar-ticularproblemregardingpowerconverter-basedWTGsisthatstandardcontrollersd
3、esignedforreliableoperationaroundnom-inalvoltagelevelswillnotworkasdesignedduringlownetworkvoltagesthatcanoccurduringafault.Aconsequenceofthisisgreatlyincreasedconvertercurrents,whichmayleadtoconverterfailure.Thispaperpresentsanonlinearcontrollerdesignf
4、orapowerconverter-basedWTGthatensuresthatcurrentlevelsremainwithindesignlimits,evenatgreatlyreducedvoltagelevels,thusenhancingtheWTG’sfaultride-throughcapability.IndexTerms—Currentcontrol,digitalsignalprocessors,powersystems,variable-speeddrives,windene
5、rgy,windpowerFig.1.Faultride-throughrequirementofwind-farms;voltageversustimegeneration.profileatpointofconnection.I.NOMENCLATUREsystemduringfaults.Duetothisrequirement,systemopera-torsinmanycountrieshaverecentlyestablishedtransmissionCapacitance(F).andd
6、istributionsystemgridcodesthatspecifytherangeofCurrent(A).voltageconditionsforwhichWTGs)mustremainconnected,,,,,,Gains.tothepowersystem.ThesearecommonlyreferredtoastheInductance(H).faultride-throughspecifications.InJuly2004,thewind-farmReferenceframeangu
7、lartransmissiongridcodewasreleasedintheRepublicofIreland.velocity(rad/s).Thefaultride-throughrequirementsforWTGsconnectedtotheResistance.IrishtransmissionsystemarespecifiedinWF1.4.1oftheWind,Voltage(V).FarmTransmissionGridCodeProvisionsasfollows[1].ASubs
8、criptsSuperscriptsandOperatorswindfarmshallremainconnectedtothetransmissionsystemReferencevalue.fortransmissionsystemvoltagedipsonanyorallphases,where,Direct,quadratureaxisthetransmissionsystemvoltagemeasuredattheHVterminalscompo
