Article(id=1322531246257852712, tenantId=1146029695717560320, journalId=1146031654075715584, issueId=1322531228222337541, articleNumber=null, orderNo=null, doi=10.13234/j.issn.2095-2805.2026.3.324, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1753286400000, receivedDateStr=2025-07-24, revisedDate=1755792000000, revisedDateStr=2025-08-22, acceptedDate=1757606400000, acceptedDateStr=2025-09-12, onlineDate=1793245620550, onlineDateStr=2026-10-29, pubDate=1774800000000, pubDateStr=2026-03-30, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1793245620550, onlineIssueDateStr=2026-10-29, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1793245620550, creator=13701087609, updateTime=1793245620550, updator=13701087609, issue=Issue{id=1322531228222337541, tenantId=1146029695717560320, journalId=1146031654075715584, year='2026', volume='24', issue='3', pageStart='1', pageEnd='343', issueExtLink='null', onlineDate='null', pubDate='1774800000000', pubDateStr='2026-03-30', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1793245616250, creator='13701087609', updateTime=1793245616250, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext=null, issueFiles=null, downloadFileDto=null}, startPage=324, endPage=334, ext={EN=ArticleExt(id=1322531246463373609, articleId=1322531246257852712, tenantId=1146029695717560320, journalId=1146031654075715584, language=EN, title=Diagnosis and Localization Method for Single-switch Open-circuit Fault in Submodules of Modular Multilevel Converter, columnId=1321491668864455519, journalTitle=Journal of Power Supply, columnName=Fault Diagnosis and Reliability, runingTitle=null, highlight=null, articleAbstract=

The sorting voltage equalization algorithm is often used as a submodule capacitor voltage control strategy for a modular multilevel converter (MMC), which poses a challenge in locating the open-circuit fault of an upper switch in a half-bridge submodule. To solve this problem, a method for locating the insulated gate bipolar transistor (IGBT) open-circuit fault in the submodule of MMC based on reconstructed subunit voltage is proposed. The voltage circuit equation of a three-phase MMC is established, and the influence of current flow path on the capacitor voltage and the reasons for abnormal output current and bridge arm circulating current are analyzed when an open-circuit fault for a single-switch occurs in the half-bridge submodule. An adaptive state observer based on extended Kalman filter (EKF) is used to achieve the optimal estimation of output current and bridge arm circulating current, and fault diagnosis is performed using the residuals between the optimal estimation value and the actual sampling value. Subsequently, the submodules with the same position as the faulty bridge arm in the three-phase system are grouped and reconstructed, so as to obtain the reconstructed subunits. The adaptive state observer based on EKF is utilized to estimate the reconstructed subunit voltage, and the difference between the estimated value and the actual average voltage of the corresponding reconstructed subunit is compared with a preset threshold, thus achieving the fault localization. Four typical IGBT open-circuit fault conditions of submodules were selected for experimental verification, and experimental results show that the proposed fault diagnosis and localization method is correct and feasible.

, authors=Xiangdong SUN, Zhouruixing WANG, Yuchen WU, Biying REN, Yang AN, authorsList=Xiangdong SUN, Zhouruixing WANG, Yuchen WU, Biying REN, Yang AN, authorCompany=null, correspAuthors=Zhouruixing WANG, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1322531250380853549, articleId=1322531246257852712, tenantId=1146029695717560320, journalId=1146031654075715584, language=CN, title=模块化多电平变换器子模块单管开路故障诊断与定位方法, columnId=1321491668998673249, journalTitle=电源学报, columnName=故障诊断与可靠性, runingTitle=null, highlight=null, articleAbstract=

模块化多电平变换器MMC（modular multilevel converter）常采用排序均压算法作为子模块电容电压控制策略，此时存在半桥子模块上管开路故障定位困难的问题，由此提出1种基于重构子单元电压的MMC子模块绝缘栅双极型晶体管IGBT（insulated gate bipolar transistor）开路故障定位方法。建立了三相MMC电压回路方程，分析了半桥子模块发生单管开路故障时电流流通路径对电容电压的影响，以及导致输出电流与桥臂环流发生异常的原因。采用基于扩展卡尔曼滤波器EKF（extended Kalman filter）的自适应状态观测器对输出电流和桥臂环流进行最优估计，利用上述最优估计值与实际采样值之间的残差进行故障诊断。随后对三相系统中与故障桥臂位置相同的子模块进行分组重构，得到重构子单元，利用基于EKF的自适应状态观测器估计重构子单元电压，将其与对应的重构子单元实际电压平均值之间的差值与设定的阈值进行比较，从而实现故障定位。选取4种典型子模块IGBT开路故障工况进行实验验证，实验结果表明所提出的故障诊断及定位方法正确可行。

, authors=孙向东中国电源学会会员, 王周瑞兴, 吴宇臣, 任碧莹, 安杨中国电源学会会员, authorsList=孙向东中国电源学会会员, 王周瑞兴, 吴宇臣, 任碧莹, 安杨中国电源学会会员, authorCompany=null, correspAuthors=王周瑞兴, authorNote=, correspAuthorsNote=, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=bC9jZMD1GjaBxq61flM9Ww==, magXml=qMICYUV64RKpuONNT2UMaA==, pdfUrl=null, pdf=NzlCx64r9AQk0UiKPq7sJQ==, pdfFileSize=7715337, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=YRBifEbvFo8OshqwvAymRA==, mapNumber=null, fund=null)}, authors=[Author(id=1322531399760990265, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1322531246257852712, orderNo=0, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=sxd1030@xaut.edu.cn, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1322531401468071995, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1322531246257852712, authorId=1322531399760990265, language=EN, stringName=Xiangdong SUN, firstName=Xiangdong, middleName=null, lastName=SUN, prefix=null, suffix=Member, CPSS, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=null, address=College of Electrical Engineering, Xi’an University of Technology, Xi’an 710048, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1322531401606484028, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1322531246257852712, authorId=1322531399760990265, language=CN, stringName=孙向东中国电源学会会员, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=null, address=西安理工大学电气工程学院，西安　710048, bio={"content":"

孙向东（1971—　），男，中国电源学会会员，博士，教授。研究方向：电机控制技术，太阳能光伏发电技术，储能变流器技术，微电网控制技术。E-mail：sxd1030@xaut.edu.cn。

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孙向东（1971—　），男，中国电源学会会员，博士，教授。研究方向：电机控制技术，太阳能光伏发电技术，储能变流器技术，微电网控制技术。E-mail：sxd1030@xaut.edu.cn。

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吴宇臣（2000—　），男，硕士研究生。研究方向：储能变流器技术。E-mail：wuyu992cc@163.com。

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吴宇臣（2000—　），男，硕士研究生。研究方向：储能变流器技术。E-mail：wuyu992cc@163.com。

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任碧莹（1971—　），女，博士，教授。研究方向：储能变换技术，新能源发电技术，电动汽车充放电控制，微电网控制。E-mail：renby@xaut.edu.cn。

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任碧莹（1971—　），女，博士，教授。研究方向：储能变换技术，新能源发电技术，电动汽车充放电控制，微电网控制。E-mail：renby@xaut.edu.cn。

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安杨（1990—　），男，中国电源学会会员，讲师。研究方向：模块化多电平故障诊断，AI在电力电子中的应用。E-mail：1190313028@stu.xaut.edu.cn。

"}, bioImg=null, bioContent=

安杨（1990—　），男，中国电源学会会员，讲师。研究方向：模块化多电平故障诊断，AI在电力电子中的应用。E-mail：1190313028@stu.xaut.edu.cn。

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