文章编号：1673-0291（2023）03-0130-10DOI：10.11860/j.issn.1673-0291.20210097第47卷第3期2023年6月Vol.47No.3Jun.2023北京交通大学学报JOURNALOFBEIJINGJIAOTONGUNIVERSITY不平衡网压下储能型MMC的改进虚拟同步机控制潘子迅，杨晓峰，陶海波，张延彬（北京交通大学电气工程学院，北京100044）摘要：基于传统虚拟同步机（VirtualSynchronousGenerator，VSG）控制的储能型模块化多电平换流器（ModularMultilevelConverter，MMC）在不平衡网压下输出电流不平衡且存在功率二倍频脉动.为避免过大的有功功率纹波影响网侧频率支撑性能，针对改进型MMC超级电容对称储能系统（ImprovedMMCbasedonSymmetricalSuperCapacitorEnergyStorageSystem，IMMC-SSCESS）数学模型，分析其在不平衡网压下电流不平衡与功率脉动产生机理，提出基于电流参考指令修正和负序电压补偿的改进VSG控制.研究结果表明：改进VSG控制能实现输出电流平衡、有功脉动抑制和无功脉动抑制3种控制目标，各控制目标下IMMC-SSCESS有功功率纹波显著降低或抑制为0，有效改善了其不平衡网压下的频率支撑性能.关键词：模块化多电平换流器；超级电容储能；不平衡网压；虚拟同步机；频率支撑中图分类号：TM341；TM46文献标志码：AModifiedvirtualsynchronousgeneratorcontrolformodularmultilevelconverterwithenergystoragesystemunderunbalancedgridPANZixun,YANGXiaofeng,TAOHaibo,ZHANGYanbin（SchoolofElectricalEngineering,BeijingJiaotongUniversity,Beijing100044,China）Abstract:Theoutputcurrentoftheenergystorage-basedModularMultilevelConverter(MMC)withtraditionalVirtualSynchronousGenerator(VSG)controlexhibitsimbalanceandcontainspowerdouble-linefrequencyrippleunderunbalancedgridvoltage.Toavoidtheinfluenceofexcessiveactivepowerrippleonthegrid-sidefrequencysupportperformance,buildingontheimprovedVSGcontrolstrategybasedonthemathematicalmodeloftheImprovedMMCwithSymmetricalSuperCapacitorEnergyStorageSystem(IMMC-SSCESS),thispaperanalyzesthemechanismofcurrentimbalanceandpowerripplegenerationunderunbalancedgridvoltageandproposesanimprovedVSGcontrolstrategybasedoncurrentreferenceinstructioncorrectionandnegative-sequencevoltagecompensa⁃tion.TheresearchresultsshowthattheimprovedVSGcontrolstrategycanachievethreecontrolob⁃j...
