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基于MMC模块化多电平STATCOM的环流抑制均压控制策略研究.docx

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基于MMC模块化多电平STATCOM的环流抑制均压控制策略研究 Abstract: Withtheincreasingproportionofrenewableenergysourcesinpowergrids,thestabilityofthepowersystemhasbecomeamajorconcern.Variouscontrolstrategieshavebeenproposedanddevelopedforimprovingthestabilityandreliabilityofthepowersystem.ThispaperpresentsaresearchonthecontrolstrategyofModularMultilevelConverter(MMC)basedMulti-LevelSTATCOMforsuppressingcirculatingcurrentandvoltagecontrolwiththeMMCtechnology.TheproposedcontrolstrategyisimplementedintheMMC-basedSTATCOMsystem,whichhasmanyadvantagessuchashighefficiency,highpowerdensity,andsuperiorvoltagecontrolcapabilities. Introduction: TheSTATCOMsystemisanimportantequipmentforpowerqualitycontrol,whichcanprovideastablevoltageandreactivepowersupporttothegrid.However,thetraditionalSTATCOMsystemhassomedrawbacks,suchaslowvoltagecapacity,lowpowerfactorcorrectioncapability,andtheinabilitytosuppressthecirculatingcurrentinamulti-terminalsystem.Inthispaper,weproposeacontrolstrategybasedontheMMCtechnologyforsuppressingcirculatingcurrentandbalancingvoltageintheMulti-LevelSTATCOMsystem. MMCBasedSTATCOM: TheMulti-LevelSTATCOMsystembasedonMMCtechnologyconsistsofseveralsub-modulesconnectedinseries.Thesesub-modulesareconnectedwiththehelpofDCcapacitors,andeachsub-modulehasseveralH-bridgecellsconnectedinseries.ThemainadvantagesofMMCareitsmodularity,scalability,andreliability.TheMMCiscapableofachievinghighvoltagelevelswithlowharmonicdistortionandcanalsooperateathighswitchingfrequencies. ControlStrategy: TheproposedcontrolstrategyaimstosuppressthecirculatingcurrentandbalancethevoltagelevelsintheMulti-LevelSTATCOMsystem.Inordertoeliminatethecirculatingcurrent,afeedbackloopisaddedtothecontrolsystem.ThefeedbacksignalisproportionaltothetotaloutputcurrentoftheSTATCOMsystem.Thecirculatingcurrentisthencalculatedbysubtractingtheactivepowerfromthetotaloutputpower.ThefeedbackloopisdesignedtoadjusttheoutputpoweroftheSTATCOMsystemtomatchtheinputpower,therebykeepingthecirculatingcurrentzero. Forthevoltagebalancingoperation,ase