View in EDS HTML Full Text PDF Full Text

An Abnormal Increase in Switching Frequency in Multi-Sources Line Commutated Converter and Suppression Method.

Saved in:
Bibliographic Details
Title: An Abnormal Increase in Switching Frequency in Multi-Sources Line Commutated Converter and Suppression Method.
Authors: Mao, Xintong1 (AUTHOR), Zhang, Xianmeng2 (AUTHOR), Ling, Jian1,3 (AUTHOR), Yan, Honglin1 (AUTHOR), Jing, Rui1,2 (AUTHOR), Liu, Zhihan1,3 (AUTHOR), Wang, Chuyang3 (AUTHOR) wangchuyang@hhu.edu.cn
Source: Energies (19961073). Feb2026, Vol. 19 Issue 4, p870. 27p.
Subject Terms: *Pulse width modulation, *Thermal stability, *Power electronics, *Electric current converters, *Electronic modulation, *Harmonic suppression filters
Abstract: Distinct from the traditional Modular Multilevel Converter (MMC) which focuses on fundamental frequency operation, the Static Var and Filter (SVF) within the Multi-Source Line-Commutated Converter (SLCC) system is tasked with the core function of high-frequency harmonic filtering. This paper reveals a unique engineering reliability issue stemming from this functional difference: to satisfy the Nyquist sampling theorem for precise tracking and elimination of high-frequency harmonics, the update frequency of the capacitor voltage balancing algorithm in the SLCC-SVF system is forced to increase significantly. Mathematical modeling and quantitative analysis demonstrate that this strong coupling between harmonic tracking demands and the voltage sorting strategy directly drives an abnormal surge in the average switching frequency (reaching over five times that of the fundamental condition), severely threatening device safety. To address this, an optimized adaptive hybrid modulation strategy is proposed. The system operates under Nearest Level Modulation (NLM) in normal conditions and automatically transitions to Carrier Phase-Shifted PWM (CPS-PWM)—leveraging its closed-loop balancing capability—when switching frequency or junction temperature exceeds safety thresholds. Furthermore, a non-integer frequency ratio optimization theory for low-modulation indices is constructed specifically for SVF conditions to prevent low-frequency oscillations. PLECS simulation results validate the theoretical analysis, showing that the proposed strategy effectively reduces the average switching frequency by approximately 20% under complex harmonic conditions, significantly enhancing thermal stability and operational reliability while guaranteeing filtering performance. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
Full text is not displayed to guests.
FullText Links:
  – Type: pdflink
Text:
  Availability: 1
Header DbId: enr
DbLabel: Energy & Power Source
An: 191973290
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: An Abnormal Increase in Switching Frequency in Multi-Sources Line Commutated Converter and Suppression Method.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Mao%2C+Xintong%22">Mao, Xintong</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Xianmeng%22">Zhang, Xianmeng</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ling%2C+Jian%22">Ling, Jian</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yan%2C+Honglin%22">Yan, Honglin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jing%2C+Rui%22">Jing, Rui</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Zhihan%22">Liu, Zhihan</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Chuyang%22">Wang, Chuyang</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> wangchuyang@hhu.edu.cn</i>
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Energies+%2819961073%29%22">Energies (19961073)</searchLink>. Feb2026, Vol. 19 Issue 4, p870. 27p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Pulse+width+modulation%22">Pulse width modulation</searchLink><br />*<searchLink fieldCode="DE" term="%22Thermal+stability%22">Thermal stability</searchLink><br />*<searchLink fieldCode="DE" term="%22Power+electronics%22">Power electronics</searchLink><br />*<searchLink fieldCode="DE" term="%22Electric+current+converters%22">Electric current converters</searchLink><br />*<searchLink fieldCode="DE" term="%22Electronic+modulation%22">Electronic modulation</searchLink><br />*<searchLink fieldCode="DE" term="%22Harmonic+suppression+filters%22">Harmonic suppression filters</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Distinct from the traditional Modular Multilevel Converter (MMC) which focuses on fundamental frequency operation, the Static Var and Filter (SVF) within the Multi-Source Line-Commutated Converter (SLCC) system is tasked with the core function of high-frequency harmonic filtering. This paper reveals a unique engineering reliability issue stemming from this functional difference: to satisfy the Nyquist sampling theorem for precise tracking and elimination of high-frequency harmonics, the update frequency of the capacitor voltage balancing algorithm in the SLCC-SVF system is forced to increase significantly. Mathematical modeling and quantitative analysis demonstrate that this strong coupling between harmonic tracking demands and the voltage sorting strategy directly drives an abnormal surge in the average switching frequency (reaching over five times that of the fundamental condition), severely threatening device safety. To address this, an optimized adaptive hybrid modulation strategy is proposed. The system operates under Nearest Level Modulation (NLM) in normal conditions and automatically transitions to Carrier Phase-Shifted PWM (CPS-PWM)—leveraging its closed-loop balancing capability—when switching frequency or junction temperature exceeds safety thresholds. Furthermore, a non-integer frequency ratio optimization theory for low-modulation indices is constructed specifically for SVF conditions to prevent low-frequency oscillations. PLECS simulation results validate the theoretical analysis, showing that the proposed strategy effectively reduces the average switching frequency by approximately 20% under complex harmonic conditions, significantly enhancing thermal stability and operational reliability while guaranteeing filtering performance. [ABSTRACT FROM AUTHOR]
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=enr&AN=191973290
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.3390/en19040870
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 27
        StartPage: 870
    Subjects:
      – SubjectFull: Pulse width modulation
        Type: general
      – SubjectFull: Thermal stability
        Type: general
      – SubjectFull: Power electronics
        Type: general
      – SubjectFull: Electric current converters
        Type: general
      – SubjectFull: Electronic modulation
        Type: general
      – SubjectFull: Harmonic suppression filters
        Type: general
    Titles:
      – TitleFull: An Abnormal Increase in Switching Frequency in Multi-Sources Line Commutated Converter and Suppression Method.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Mao, Xintong
      – PersonEntity:
          Name:
            NameFull: Zhang, Xianmeng
      – PersonEntity:
          Name:
            NameFull: Ling, Jian
      – PersonEntity:
          Name:
            NameFull: Yan, Honglin
      – PersonEntity:
          Name:
            NameFull: Jing, Rui
      – PersonEntity:
          Name:
            NameFull: Liu, Zhihan
      – PersonEntity:
          Name:
            NameFull: Wang, Chuyang
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 15
              M: 02
              Text: Feb2026
              Type: published
              Y: 2026
          Identifiers:
            – Type: issn-print
              Value: 19961073
          Numbering:
            – Type: volume
              Value: 19
            – Type: issue
              Value: 4
          Titles:
            – TitleFull: Energies (19961073)
              Type: main
ResultId 1