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1、上海交通大學(xué)碩士學(xué)位論文whichhasthecapabilitytoinjectorabsorbreactivecurrents.Inthispaper,twotypesofSTATCOMtopologies,namely,threesingle-phaseSTATCOMandthree-phasefour-wireSTATCOMareinvestigated.Inordertoovercomethedeficienciesofthepoorharmonicdetectionprecisionandtheunsatisfactoryperformanceofthecon
2、ventionaldoubleclosed-loopproportional-integralcontrollers,anewcurrent-loopcontrollerisproposedforthethreesingle-phaseSTATCOMs,whichcombinestheconventionalPIregulatorsandtheresonantcontrollers.Extensivesimulationresultsundervariousloaddisturbancescenariosdemonstratethattheproposedcontrols
3、trategyhasexcellentperformanceswithimprovedharmonicrejectioncapabilityandperfectgrid-sidecurrents.Asforthethree-phasefour-wireSTATCOMtopologies,thethree-dimensionalpulse-widthmodulationschemeisadoptedandthemathematicalmodelinstationaryα-β-0coordinatesisderived.Besides,theperfectharmonicco
4、mpensation(PHC)strategyisproposedtoensurestableoperationoftheSTATCOMundergridvoltageunbalanceand/orharmonics.Thedecoupleddoublesynchronousreferenceframephase-lockedloop(DDSRF-PLL)isutilizedforphasesynchronizationoftheSTATCOM.Bydecouplingthevectorofgridvoltagesintopositive-andnegative-sequ
5、encecomponents,fastpositive-sequencecomponentestimationforthegridvoltagescanbeachieved,evenunderseveregridvoltageunbalanceand/harmonics.Thesimulationresultsdemonstratethatthethree-phasefour-wireSTATCOMwithDDSRF-PLLcanprovideaccuratecompensationperformancefortheunbalancedloadbycompensating
6、thezero-sequenceandAbstractnegative-sequencecomponentsofloadcurrents,andalsoprovidesatisfactoryperformanceundergridvoltagesunbalanceand/orharmonics.Finally,acost-effectivesoluationforreactivecompensationisproposedbythecombinedTSCandSTATCOMmethodology.Thecoordinatedoperationofthesetwodevic
7、esisrealizedbyproperlyselectionofthereferencecompensationcurrentsforindividualdevice.ThevalidityandeffectivenessoftheproposedcompensationschemeisverifiedbythesimulationresultsobtainedfromMatlab/Simulink.Keywords:reactivepowercompensation;thyristorswitchedcapacitor(T
