{"title":"Research on the Capability of Star-Connected CHB-STATCOM to Compensate the Unbalanced Voltage of Power Grid","authors":"Jiahao Li;Yingjie He;Jinjun Liu","doi":"10.1109/TPEL.2025.3532479","DOIUrl":null,"url":null,"abstract":"For the grid voltage unbalance issue, in this article, the scheme of using star-connected cascaded H-bridge static synchronous compensator (CHB-STATCOM) to suppress the unbalanced voltage at the point of common coupling (PCC) is introduced. However, the capability of star-connected CHB-STATCOM to compensate the unbalanced voltage at the PCC is limited for a certain dc-link voltage. When exceeding the effective compensation range, the star-connected CHB-STATCOM not only fails to achieve the compensation of unbalanced voltage at the PCC, but also further deteriorates the power quality of the grid. In this article, the unbalanced voltage at the PCC caused by load unbalance and power supply unbalance is considered comprehensively, the key influencing factors and quantitative relationship of the maximum output voltage of the star-connected CHB-STATCOM injecting zero-sequence voltage are analyzed in detail, and the effective compensation range of the star-connected CHB-STATCOM for unbalanced voltage at the PCC is given in a quantitative manner. These quantitative analyses provide reference limitation for star-connected CHB-STATCOM to compensate unbalanced voltage at the PCC, which is significant for real-time regulation and selection of the star-connected CHB-STATCOM. Finally, the correctness of the theoretical analysis is verified by simulation and experiment.","PeriodicalId":13267,"journal":{"name":"IEEE Transactions on Power Electronics","volume":"40 6","pages":"8577-8591"},"PeriodicalIF":6.5000,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Transactions on Power Electronics","FirstCategoryId":"5","ListUrlMain":"https://ieeexplore.ieee.org/document/10850884/","RegionNum":1,"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
For the grid voltage unbalance issue, in this article, the scheme of using star-connected cascaded H-bridge static synchronous compensator (CHB-STATCOM) to suppress the unbalanced voltage at the point of common coupling (PCC) is introduced. However, the capability of star-connected CHB-STATCOM to compensate the unbalanced voltage at the PCC is limited for a certain dc-link voltage. When exceeding the effective compensation range, the star-connected CHB-STATCOM not only fails to achieve the compensation of unbalanced voltage at the PCC, but also further deteriorates the power quality of the grid. In this article, the unbalanced voltage at the PCC caused by load unbalance and power supply unbalance is considered comprehensively, the key influencing factors and quantitative relationship of the maximum output voltage of the star-connected CHB-STATCOM injecting zero-sequence voltage are analyzed in detail, and the effective compensation range of the star-connected CHB-STATCOM for unbalanced voltage at the PCC is given in a quantitative manner. These quantitative analyses provide reference limitation for star-connected CHB-STATCOM to compensate unbalanced voltage at the PCC, which is significant for real-time regulation and selection of the star-connected CHB-STATCOM. Finally, the correctness of the theoretical analysis is verified by simulation and experiment.
期刊介绍：
The IEEE Transactions on Power Electronics journal covers all issues of widespread or generic interest to engineers who work in the field of power electronics. The Journal editors will enforce standards and a review policy equivalent to the IEEE Transactions, and only papers of high technical quality will be accepted. Papers which treat new and novel device, circuit or system issues which are of generic interest to power electronics engineers are published. Papers which are not within the scope of this Journal will be forwarded to the appropriate IEEE Journal or Transactions editors. Examples of papers which would be more appropriately published in other Journals or Transactions include: 1) Papers describing semiconductor or electron device physics. These papers would be more appropriate for the IEEE Transactions on Electron Devices. 2) Papers describing applications in specific areas: e.g., industry, instrumentation, utility power systems, aerospace, industrial electronics, etc. These papers would be more appropriate for the Transactions of the Society which is concerned with these applications. 3) Papers describing magnetic materials and magnetic device physics. These papers would be more appropriate for the IEEE Transactions on Magnetics. 4) Papers on machine theory. These papers would be more appropriate for the IEEE Transactions on Power Systems. While original papers of significant technical content will comprise the major portion of the Journal, tutorial papers and papers of historical value are also reviewed for publication.
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