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Enhancing Common-Mode Loop Stability of Three-Phase Four-Bridge Grid-Connected Inverters via Control Delay.

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Title: Enhancing Common-Mode Loop Stability of Three-Phase Four-Bridge Grid-Connected Inverters via Control Delay.
Authors: Zhong, Qiyu1 (AUTHOR), Bai, Hao2 (AUTHOR), Chen, Guangming1,2 (AUTHOR), Tan, Yingjie2 (AUTHOR) tanyj1@csg.cn, Lin, Jieyu1 (AUTHOR), Liu, Yipeng2 (AUTHOR)
Source: Energies (19961073). Feb2026, Vol. 19 Issue 3, p646. 18p.
Subject Terms: *Electric inverters, *Closed loop system stability, *Distributed power generation, *Time delay systems, *Feedback control system stability
Abstract: As the three-phase four-bridge inverter (3P4B) can effectively compensate for the unbalanced three-phase loads in the grid, it is an important converter option for distributed generation grid connection. As in a three-phase three-bridge inverter (3P3B), the wide variation in grid impedance also poses instability issues for 3P4B. This issue has been well-addressed for 3P3B, which can be seen as a differential-mode circuit. However, 3P4B has an extra common-mode circuit, and the solution to the instability problem has not been investigated so far. To address this issue, this paper first analyzes the mechanism of 3P4B common-mode circuit instability and discovers its stability range difference from its differential-mode circuit. Then, an equivalent control delay compensator is independently introduced into the common-mode loop, which extends its stable range. This paper also conducts a detailed analysis of the control delay compensator's impacts on the common-mode control loop and proposes a quantitative design method for the compensator accordingly. Experimental results validate that the proposed method effectively mitigates common-mode loop instability even under a wide range of grid impedance variations. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 191587125
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Enhancing Common-Mode Loop Stability of Three-Phase Four-Bridge Grid-Connected Inverters via Control Delay.
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  Data: <searchLink fieldCode="AR" term="%22Zhong%2C+Qiyu%22">Zhong, Qiyu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bai%2C+Hao%22">Bai, Hao</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+Guangming%22">Chen, Guangming</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tan%2C+Yingjie%22">Tan, Yingjie</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> tanyj1@csg.cn</i><br /><searchLink fieldCode="AR" term="%22Lin%2C+Jieyu%22">Lin, Jieyu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Yipeng%22">Liu, Yipeng</searchLink><relatesTo>2</relatesTo> (AUTHOR)
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  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Energies+%2819961073%29%22">Energies (19961073)</searchLink>. Feb2026, Vol. 19 Issue 3, p646. 18p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Electric+inverters%22">Electric inverters</searchLink><br />*<searchLink fieldCode="DE" term="%22Closed+loop+system+stability%22">Closed loop system stability</searchLink><br />*<searchLink fieldCode="DE" term="%22Distributed+power+generation%22">Distributed power generation</searchLink><br />*<searchLink fieldCode="DE" term="%22Time+delay+systems%22">Time delay systems</searchLink><br />*<searchLink fieldCode="DE" term="%22Feedback+control+system+stability%22">Feedback control system stability</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: As the three-phase four-bridge inverter (3P4B) can effectively compensate for the unbalanced three-phase loads in the grid, it is an important converter option for distributed generation grid connection. As in a three-phase three-bridge inverter (3P3B), the wide variation in grid impedance also poses instability issues for 3P4B. This issue has been well-addressed for 3P3B, which can be seen as a differential-mode circuit. However, 3P4B has an extra common-mode circuit, and the solution to the instability problem has not been investigated so far. To address this issue, this paper first analyzes the mechanism of 3P4B common-mode circuit instability and discovers its stability range difference from its differential-mode circuit. Then, an equivalent control delay compensator is independently introduced into the common-mode loop, which extends its stable range. This paper also conducts a detailed analysis of the control delay compensator's impacts on the common-mode control loop and proposes a quantitative design method for the compensator accordingly. Experimental results validate that the proposed method effectively mitigates common-mode loop instability even under a wide range of grid impedance variations. [ABSTRACT FROM AUTHOR]
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=enr&AN=191587125
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      – Type: doi
        Value: 10.3390/en19030646
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 18
        StartPage: 646
    Subjects:
      – SubjectFull: Electric inverters
        Type: general
      – SubjectFull: Closed loop system stability
        Type: general
      – SubjectFull: Distributed power generation
        Type: general
      – SubjectFull: Time delay systems
        Type: general
      – SubjectFull: Feedback control system stability
        Type: general
    Titles:
      – TitleFull: Enhancing Common-Mode Loop Stability of Three-Phase Four-Bridge Grid-Connected Inverters via Control Delay.
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            NameFull: Zhong, Qiyu
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            NameFull: Bai, Hao
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            NameFull: Chen, Guangming
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            NameFull: Tan, Yingjie
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            NameFull: Lin, Jieyu
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            NameFull: Liu, Yipeng
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            – D: 01
              M: 02
              Text: Feb2026
              Type: published
              Y: 2026
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              Value: 19961073
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              Value: 19
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            – TitleFull: Energies (19961073)
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