三电平逆变器中点电位偏移机理分析与平衡方法研究.pdf
第22卷增刊1电源学报Vol.22Suppl.1
2024年9月JournalofPowerSupplySept.2024
D0I:10.13234/j.issn.2095-2805.2024.S1.50中图分类号:TM464文献标志码:A
三电平逆变器中点电位偏移机理分析与
平衡方法研究
耿后来1,高宁2(中国电源学会会员),吴卫民²
(1.阳光电源股份有限公司,合肥201306)
已230088;2.上海海事大学电气工程系,上海
摘要:针对三电平中点钳位逆变器的中点电位平衡控制问题,分析T型三电平逆变器的中点波动原因,基
于无谐波注入和动态谐波注入方式对中点电流三次谐波的周期傅里叶级数进行推导分析。首先推导出一种开环
的谐波注入算法,在此基础上提出一种基于比例谐振控制器的闭环谐波注入算法进行中点电流抑制。采用
MATLAB/Simulink仿真软件对开环谐波注入和闭环谐波注入的算法进行了仿真,搭建了40kW的三电平逆变器
进行了实验验证。仿真和实验结果均可验证理论分析的正确性及所提控制策略的有效性。
关键词:三电平逆变器;中点电位;比例谐振控制
AnalysisofNeutral-pointPotentialShiftMechanismand
BalanceMethodforThree-levelInverter
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GENGHoulail,GAONing²,Member,CPSS,WUWeimin
(1.SungrowPowerSupplyCo.,Ltd.,Hefei230088,China;2.DepartmentofElectricalEngineering,Shanghai
MaritimeUniversity,Shanghai201306,China)
Abstract:Aimedattheproblemofneutral-pointpotentialbalancecontrolofthree-levelneutral-pointclamped
inverters,thecauseofneutral-pointfluctuationofaT-typethree-levelinverterwasanalyzed.Basedonthe
non-harmonicinjectionanddynamicharmonicinjectionmethods,theperiodFourierseriesofthethird-orderharmonic
ofneutral-pointcurrentwasderivedandanalyzed.First,anopen-loopharmonicinjectionalgorithmwasderived,anda
closed-loopharmonicinjectionalgorithmbasedonproportional-resonancecontrollerwasproposedaccordinglyto
suppresstheneural-pointcurrent.Then,MATLAB/Simulinksimulationsoftwarewasusedtosimu