[8] A flexible active and reactive power control strategy for a variable speed constant frequency generating system.pdf

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1、412IEEETRANSACTIONSONPOWERELECTRONICS,VOL.LO,NO.4,JULY1995AFlexibleActiveandReactivePowerControlStrategyforaVariableSpeedConstantFrequencyGeneratingSystemYifanTang,Member,IEEE,andLongyaXu,SeniorMember,IEEEAbstract-Variable-speedconstant-frequencygenkratingsys-temsareusedinw

2、indpower,hydropower,aerospace,andnavalpowergenerationstoenhanceefficiencyandreducefriction.Intheseapplications,anattractivecandidateistheslippowerrecoverysystemcomprisingofdoublyexcitedinductionmachineordoublyexcitedbrushlessreluctancemachineandPWMcon-verterswithadclink.Int

3、hispaper,aflexibleactiveandreactivepowercontrolstrategyisdeveloped,suchthattheoptimaltorque-speedprofileoftheturbinecanbefollowedandoverallreactivepowercanbecontrolled,whilethemachinecopperlosseshaveFig.1.PowerflowofSlipPowerRecoverySystem.beenminimized.Atthesametime,harmon

4、icsinjectedintothepowernetworkhasalsobeenminimized.Inthismanner,thesystemcanfunctionasbothahigh-efficientpowergeneratorandsingly-excitedadjustablespeeddrivebysimplethyristorrecti-aflexiblereactivepowercompensator.fierusinganinnovativedcreactorcircuit.Itisagoodexampleofcost-

5、reductionforpowerregenerationofhigh-powerdrives.I.INTRODUCTIONForageneratingsystem,however,thisschemewouldnotbeARIABLE-SPEEDconstant-frequency(VSCF)powerawisechoiceifreactivepowercontrolisrequired.[4]hadVgeneratingisdesirableinmanysituations.Asalientdevelopedastatorfieldori

6、entedcontrolforthedoubly-excitedexampleisthewindpowergeneration,whereturbinespeedinductiongenerator,inwhichboththeactiveandreactiveshouldbeabletovaryaccordingtothewindspeed,suchthatpowerofthestatorarecontrolledbyaPWMregulatedcurrentenergyefficiencycanBeimprovedwithareducedt

7、orsionalintherotorcircuit.Ithadalsobeenshownthattheconceptstressandwindagefrictiononthewindmillblades.Whileinin[4]isapplicabletothedoubly-excitedbrushlessreluctancevariablespeed,thesystemoutputvoltageshouldbemaintainedmachine[5].ataconstantfrequencytointerfacewiththepowersy

8、stem.Conventionalslippowerrecoverysystemshadbeenex-OtherapplicationsofVSCFincludeh