可再生能源课程作业Power wind IG.doc

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PowerwindIG

Accordingtothewindspeedchange,generatorspeedneedtoadjustconstantly,sotheoutputofgenerator’spowervoltageandfrequencyisnotconstant.Awindfarmconsistingofsix1.5-MWwindturbinesisconnectedtoa25-kVdistributionsystemexportspowertoa120-kVgridthrougha25-km25-kVfeeder.The9-MWwindfarmissimulatedbythreepairsof1.5MWwind-turbines.Windturbinesusesquirrel-cageinductiongenerators(IG).Thestatorwindingisconnecteddirectlytothe60Hzgridandtherotorisdrivenbyavariable-pitchwindturbine.Thepitchangleiscontrolledinordertolimitthegeneratoroutputpoweratitsnominalvalueforwindsexceedingthenominalspeed(9m/s).InordertogeneratepowertheIGspeedmustbeslightlyabovethesynchronousspeed.

Thesimulationresults:

1.Changethephaseoffault

EnableABtogroundfault[1515.1]s

Figure1-1waveofwindturbinesscope

(1)Fromfigure1-1,wecanseethatinitially,windspeedissetat8m/s,thenstartingatt=2sforWindturbine1,windspeedisrammedto11m/sin3seconds.ThesamegustofwindisappliedtoTurbine2andTurbine3,respectivelywith2secondsand4secondsdelays.Then,att=15satemporaryfaultisappliedatthelowvoltageterminals(575V)ofWindTurbine2.

Whenthewindspeedreaches9m/s,Theratedactivepowerofthewindturbine1-3reach3MW.Whenthewindspeedcontinueincreasing,theoutputpowerexceed3MW,thepitchangleisincreasedfrom0degto8deginordertobringoutputpowerbacktoitsnominalvalue.

WhentheABgroundfaultoccursatt=15s,windturbine2stopsworking,p=0MW,andturbine1andturbine3returntonormalafterashortfaulttransient.

Figure1-2waveofstatcomscope

(2)Wheninductivegeneratorisworking,theremustbeacompensatortoprovideinductivereactivepowerforinductivegenerator.Ifnot,itwillaffectthestabilityofgridvoltage.STATCOMcanreducethemagnitudeofvoltagefluctuations,

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