View in EDS HTML Full Text PDF Full Text

A Low-Switching-Frequency Harmonic-Optimized Control Strategy for Modular Multilevel Converters Based on Online SHEPWM Switching-Time Correction.

Saved in:
Bibliographic Details
Title: A Low-Switching-Frequency Harmonic-Optimized Control Strategy for Modular Multilevel Converters Based on Online SHEPWM Switching-Time Correction.
Authors: Lyu, Tingyan1,2 (AUTHOR), Tang, Bojin1,2 (AUTHOR), Deng, Youhan1,2,3 (AUTHOR), Hua, Xiaojun1,3,4 (AUTHOR), Kang, Rong1,2 (AUTHOR), Yao, Weiwei1,2 (AUTHOR), Hao, Yaru1,3 (AUTHOR), Li, Chunyang4 (AUTHOR), Yuan, Huilin4 (AUTHOR) linhayes@whu.edu.cn
Source: Energies (19961073). Sep2026, Vol. 19 Issue 18, p4434. 33p.
Subject Terms: *Pulse width modulation, *Electric current converters
Abstract: Low-switching-frequency operation is essential for high-power modular multilevel converters (MMCs), but it makes the simultaneous achievement of low harmonics, fast transient response, and reliable internal control more difficult. Conventional lookup-table selective harmonic elimination PWM (SHEPWM) preserves steady-state harmonic optimization, yet its fundamental-period pattern update limits transient flexibility; predictive pulse-pattern methods improve current or flux tracking, but do not directly coordinate the MMC execution chain from arm-level pulse displacement to physical submodule gating. This paper proposes a coordinated switching-event control scheme for SHEPWM-based MMCs. The offline harmonic-optimized pattern is used as the steady-state backbone, while selected time-stamped events are corrected online through a virtual-flux formulation. The same events are then processed by causal pulse-edge compensation, paired upper/lower-arm displacement for circulating-current suppression, and threshold-based asynchronous submodule scheduling. Simulations of startup, active-power steps, and power-flow reversal show that more than 90% of the virtual-flux error is compensated within approximately 5 ms. Device-level co-simulation reduces current THD from 1.5881% to 0.702%, and paired-event control reduces arm-current THD from 21.600% to 4.9266%. At rated steady state, the method achieves 1.25% grid-current THD with a 50 Hz average submodule switching frequency, supporting low-loss MMC operation without abandoning SHEPWM harmonic optimization. [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: 197391801
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: A Low-Switching-Frequency Harmonic-Optimized Control Strategy for Modular Multilevel Converters Based on Online SHEPWM Switching-Time Correction.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Lyu%2C+Tingyan%22">Lyu, Tingyan</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tang%2C+Bojin%22">Tang, Bojin</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Deng%2C+Youhan%22">Deng, Youhan</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hua%2C+Xiaojun%22">Hua, Xiaojun</searchLink><relatesTo>1,3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kang%2C+Rong%22">Kang, Rong</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yao%2C+Weiwei%22">Yao, Weiwei</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hao%2C+Yaru%22">Hao, Yaru</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Chunyang%22">Li, Chunyang</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yuan%2C+Huilin%22">Yuan, Huilin</searchLink><relatesTo>4</relatesTo> (AUTHOR)<i> linhayes@whu.edu.cn</i>
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Energies+%2819961073%29%22">Energies (19961073)</searchLink>. Sep2026, Vol. 19 Issue 18, p4434. 33p.
– 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="%22Electric+current+converters%22">Electric current converters</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Low-switching-frequency operation is essential for high-power modular multilevel converters (MMCs), but it makes the simultaneous achievement of low harmonics, fast transient response, and reliable internal control more difficult. Conventional lookup-table selective harmonic elimination PWM (SHEPWM) preserves steady-state harmonic optimization, yet its fundamental-period pattern update limits transient flexibility; predictive pulse-pattern methods improve current or flux tracking, but do not directly coordinate the MMC execution chain from arm-level pulse displacement to physical submodule gating. This paper proposes a coordinated switching-event control scheme for SHEPWM-based MMCs. The offline harmonic-optimized pattern is used as the steady-state backbone, while selected time-stamped events are corrected online through a virtual-flux formulation. The same events are then processed by causal pulse-edge compensation, paired upper/lower-arm displacement for circulating-current suppression, and threshold-based asynchronous submodule scheduling. Simulations of startup, active-power steps, and power-flow reversal show that more than 90% of the virtual-flux error is compensated within approximately 5 ms. Device-level co-simulation reduces current THD from 1.5881% to 0.702%, and paired-event control reduces arm-current THD from 21.600% to 4.9266%. At rated steady state, the method achieves 1.25% grid-current THD with a 50 Hz average submodule switching frequency, supporting low-loss MMC operation without abandoning SHEPWM harmonic optimization. [ABSTRACT FROM AUTHOR]
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=enr&AN=197391801
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.3390/en19184434
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 33
        StartPage: 4434
    Subjects:
      – SubjectFull: Pulse width modulation
        Type: general
      – SubjectFull: Electric current converters
        Type: general
    Titles:
      – TitleFull: A Low-Switching-Frequency Harmonic-Optimized Control Strategy for Modular Multilevel Converters Based on Online SHEPWM Switching-Time Correction.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Lyu, Tingyan
      – PersonEntity:
          Name:
            NameFull: Tang, Bojin
      – PersonEntity:
          Name:
            NameFull: Deng, Youhan
      – PersonEntity:
          Name:
            NameFull: Hua, Xiaojun
      – PersonEntity:
          Name:
            NameFull: Kang, Rong
      – PersonEntity:
          Name:
            NameFull: Yao, Weiwei
      – PersonEntity:
          Name:
            NameFull: Hao, Yaru
      – PersonEntity:
          Name:
            NameFull: Li, Chunyang
      – PersonEntity:
          Name:
            NameFull: Yuan, Huilin
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 15
              M: 09
              Text: Sep2026
              Type: published
              Y: 2026
          Identifiers:
            – Type: issn-print
              Value: 19961073
          Numbering:
            – Type: volume
              Value: 19
            – Type: issue
              Value: 18
          Titles:
            – TitleFull: Energies (19961073)
              Type: main
ResultId 1