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Dynamic Carrier Phase-Shift Control for Low-Frequency Capacitor Voltage Ripple Suppression in MMCs Under Motor Drive Electrical Operating Conditions.

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Title: Dynamic Carrier Phase-Shift Control for Low-Frequency Capacitor Voltage Ripple Suppression in MMCs Under Motor Drive Electrical Operating Conditions.
Authors: Jin, Guangzhe1 (AUTHOR), Zhang, Haomiao1 (AUTHOR), Huo, Haibo1 (AUTHOR) hbhuo@shou.edu.cn
Source: Energies (19961073). Sep2026, Vol. 19 Issue 17, p4082. 22p.
Subject Terms: *Pulse width modulation, *Motor drives (Electric motors), *Harmonic distortion (Physics), *Cascade converters
Abstract: Modular multilevel converters (MMCs) are attractive for medium- and high-power motor drive applications; however, low-speed motor operation can cause significant submodule (SM) capacitor voltage ripple. In conventional carrier phase-shifted pulse-width modulation (CPS-PWM), the carrier phase displacement is usually fixed. This fixed setting does not account for the longer capacitor charging and discharging intervals that occur as a motor's electrical frequency decreases. To address this issue, this paper develops a dynamic carrier phase-shift control strategy for MMCs under low-frequency motor drive electrical operating conditions. The proposed strategy relates the carrier phase-shift angle to the motor operating frequency through a piecewise function. A larger phase-shift angle is adopted in the low-frequency region, whereas the angle gradually returns to the conventional CPS-PWM value as the frequency increases. The strategy is implemented in the PWM generation stage through an equivalent carrier delay update, without modifying the MMC power circuit. Comparative MATLAB/Simulink simulations over the frequency range of 0.5–10 Hz are carried out to evaluate the capacitor voltage ripple, output current total harmonic distortion (THD), upper-arm current, and circulating current. The results indicate that the proposed scheme can effectively reduce the peak-to-peak capacitor voltage ripple at low frequencies while maintaining comparable AC-side output current quality and acceptable internal current behavior within the investigated converter-side electrical model. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 197040563
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Dynamic Carrier Phase-Shift Control for Low-Frequency Capacitor Voltage Ripple Suppression in MMCs Under Motor Drive Electrical Operating Conditions.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Jin%2C+Guangzhe%22">Jin, Guangzhe</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Haomiao%22">Zhang, Haomiao</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Huo%2C+Haibo%22">Huo, Haibo</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> hbhuo@shou.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 17, p4082. 22p.
– 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="%22Motor+drives+%28Electric+motors%29%22">Motor drives (Electric motors)</searchLink><br />*<searchLink fieldCode="DE" term="%22Harmonic+distortion+%28Physics%29%22">Harmonic distortion (Physics)</searchLink><br />*<searchLink fieldCode="DE" term="%22Cascade+converters%22">Cascade converters</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Modular multilevel converters (MMCs) are attractive for medium- and high-power motor drive applications; however, low-speed motor operation can cause significant submodule (SM) capacitor voltage ripple. In conventional carrier phase-shifted pulse-width modulation (CPS-PWM), the carrier phase displacement is usually fixed. This fixed setting does not account for the longer capacitor charging and discharging intervals that occur as a motor's electrical frequency decreases. To address this issue, this paper develops a dynamic carrier phase-shift control strategy for MMCs under low-frequency motor drive electrical operating conditions. The proposed strategy relates the carrier phase-shift angle to the motor operating frequency through a piecewise function. A larger phase-shift angle is adopted in the low-frequency region, whereas the angle gradually returns to the conventional CPS-PWM value as the frequency increases. The strategy is implemented in the PWM generation stage through an equivalent carrier delay update, without modifying the MMC power circuit. Comparative MATLAB/Simulink simulations over the frequency range of 0.5–10 Hz are carried out to evaluate the capacitor voltage ripple, output current total harmonic distortion (THD), upper-arm current, and circulating current. The results indicate that the proposed scheme can effectively reduce the peak-to-peak capacitor voltage ripple at low frequencies while maintaining comparable AC-side output current quality and acceptable internal current behavior within the investigated converter-side electrical model. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.3390/en19174082
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 22
        StartPage: 4082
    Subjects:
      – SubjectFull: Pulse width modulation
        Type: general
      – SubjectFull: Motor drives (Electric motors)
        Type: general
      – SubjectFull: Harmonic distortion (Physics)
        Type: general
      – SubjectFull: Cascade converters
        Type: general
    Titles:
      – TitleFull: Dynamic Carrier Phase-Shift Control for Low-Frequency Capacitor Voltage Ripple Suppression in MMCs Under Motor Drive Electrical Operating Conditions.
        Type: main
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            NameFull: Jin, Guangzhe
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            NameFull: Zhang, Haomiao
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            NameFull: Huo, Haibo
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          Dates:
            – D: 01
              M: 09
              Text: Sep2026
              Type: published
              Y: 2026
          Identifiers:
            – Type: issn-print
              Value: 19961073
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              Value: 19
            – Type: issue
              Value: 17
          Titles:
            – TitleFull: Energies (19961073)
              Type: main
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