第47卷第4期电网技术Vol.47No.42023年4月PowerSystemTechnologyApr.2023文章编号：1000-3673（2023）04-1407-08中图分类号：TM721文献标志码：A学科代码：470·40一种三相级联桥光伏并网系统参与电网频率支撑的控制策略李学庆1，原熙博2，柴建云3，黎明4，李梁冉1，由蕤1（1．青岛大学电气工程学院，山东省青岛市266071；2．中国矿业大学电气工程学院，江苏省徐州市221116；3．清华大学电机工程与应用电子技术系，北京市海淀区100084；4．中国海洋大学工程学院，山东省青岛市266100）GridFrequencySupportControlStrategyofThree-phaseCascadedH-bridgePhotovoltaicGrid-connectedSystemLIXueqing1,YUANXibo2,CHAIJianyun3,LIMing4,LILiangran1,YOURui1(1.CollegeofElectricalEngineering,QingdaoUniversity,Qingdao266071,ShandongProvince,China;2.SchoolofElectricalEngineering,ChinaUniversityofMiningandTechnology,Xuzhou221116,JiangsuProvince,China;3.DepartmentofElectricalEngineering,TsinghuaUniversity,HaidianDistrict,Beijing100084,China;4.CollegeofEngineering,OceanUniversityofChina,Qingdao266100,ShandongProvince,China)1ABSTRACT:Asacleanandsafeenergyresource,photovoltaiic(PV)powergenerationhasbecomeaneffectivewaytosolvetheproblemslikeenergycrisisandenvironmentalpollution.However,becausethePVgrid-connectedinverterdoesnothaveinertiaanddampingcharacteristics,withtheincreasedpenetrationofPVpowergenerationinthegrid,thelarge-scalePVgrid-connectionhasposedachallengetothegridfrequencystability.ThecascadedH-bridge(CHB)inverterhasbecomeapromisingcandidateforthePVsystemsduetoitsadvantagesofhavingamodularstructureandbeingabletodirectlyconnectedtothegridwithoutanypowerfrequencytransformers.Aninvertercontrolstrategywiththefunctionofsupportingthegridfrequencyisproposedinthispaperforthethree-phaseCHBPVgrid-connectedsystem.WiththePVstringactivepowerreserve,thegridfrequencydynamiccharacteristicsareimprovedwithoutanyextraenergystoragedevices.Inordertoavoidthecommonthree-phasepowerimbalancefortheCHBtopology,thepowerreservedistributioncontrolisusedinbetweenthethreephasesandbetweenthePVstringsineachphase.Therefore,thethree-phasepowerbalanceandth...
