{"title":"A Submodule Insertion Window-Based Capacitor Condition Monitoring Method for Modular Multilevel Converters","authors":"Li Zhang;Yihao Liu;Jianhao Zhang;Yue Li","doi":"10.1109/JESTPE.2024.3485114","DOIUrl":null,"url":null,"abstract":"Capacitors are key components of modular multilevel converters (MMCs), and capacitor condition monitoring (CCM) is a crucial issue in MMC. This article introduced a capacitor monitoring method based on submodule (SM) insertion windows to enhance the reliability of the MMC. First, the voltage difference between the reference SM and other SMs is monitored to assess the capacitor condition of the SMs. Second, for the selected SM capacitors in an abnormal state, an insertion window for the SM is extracted by introducing a time delay factor, and the subsequent capacitance calculation is performed based on the voltage changes of the reference SM and other SMs within the monitoring interval. The proposed monitoring method can effectively identify the abnormal capacitor state and accurately calculate the capacitance value. Moreover, the proposed method does not affect the normal operation of the MMC. Finally, simulation analysis and experimental validation are performed to verify the effectiveness of the proposed method.","PeriodicalId":13093,"journal":{"name":"IEEE Journal of Emerging and Selected Topics in Power Electronics","volume":"13 1","pages":"871-879"},"PeriodicalIF":4.6000,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Journal of Emerging and Selected Topics in Power Electronics","FirstCategoryId":"5","ListUrlMain":"https://ieeexplore.ieee.org/document/10731707/","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
引用次数: 0
Abstract
Capacitors are key components of modular multilevel converters (MMCs), and capacitor condition monitoring (CCM) is a crucial issue in MMC. This article introduced a capacitor monitoring method based on submodule (SM) insertion windows to enhance the reliability of the MMC. First, the voltage difference between the reference SM and other SMs is monitored to assess the capacitor condition of the SMs. Second, for the selected SM capacitors in an abnormal state, an insertion window for the SM is extracted by introducing a time delay factor, and the subsequent capacitance calculation is performed based on the voltage changes of the reference SM and other SMs within the monitoring interval. The proposed monitoring method can effectively identify the abnormal capacitor state and accurately calculate the capacitance value. Moreover, the proposed method does not affect the normal operation of the MMC. Finally, simulation analysis and experimental validation are performed to verify the effectiveness of the proposed method.
期刊介绍:
The aim of the journal is to enable the power electronics community to address the emerging and selected topics in power electronics in an agile fashion. It is a forum where multidisciplinary and discriminating technologies and applications are discussed by and for both practitioners and researchers on timely topics in power electronics from components to systems.