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Mechanism of Suppressing DFIG Shafting–Grid-Connected Oscillations Through Coordinated Optimization of Dual Damping Terms Under Frequency Coupling.

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Title: Mechanism of Suppressing DFIG Shafting–Grid-Connected Oscillations Through Coordinated Optimization of Dual Damping Terms Under Frequency Coupling.
Authors: Wang, Zheng1 (AUTHOR), Lu, Yimin1 (AUTHOR) y.m.lu@gxu.edu.cn
Source: Energies (19961073). Mar2026, Vol. 19 Issue 5, p1224. 21p.
Subject Terms: *Subsynchronous resonance, *Damping (Mechanics), *Optimal control theory, *Oscillations, *Electric power system stability, *Induction generators, *Wind power plants
Abstract: Sub-synchronous oscillations (SSOs) induced by the interaction between doubly fed induction generators (DFIGs) and weak grids pose a critical threat to the grid-connected stability of DFIG-based wind power systems. In this paper, a dual-damping-term compensation filter based on the concept of motion-induced amplification (MIA), together with an optimized design method using a linear quadratic regulator (LQR), is applied to the DFIG system. The effectiveness of the proposed approach in suppressing DFIG shafting oscillations and mitigating grid-connected frequency coupling is verified, and the underlying mechanisms are thoroughly investigated. By establishing a shafting dynamics model for the DFIG and a frequency-coupled oscillation impedance model, this study focuses on revealing the differentiated impacts of the dual damping parameters ( Z p and Z q ) on system stability under two operating modes: maximum power point tracking (MPPT) and constant power operation. Stability analysis based on the generalized Nyquist criterion (GNC), together with time-domain simulations, demonstrates that coordinated optimization of the dual damping terms can effectively suppress shafting oscillations and frequency coupling, thereby significantly enhancing the grid-connected stability of DFIG systems. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 192640949
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Label: Title
  Group: Ti
  Data: Mechanism of Suppressing DFIG Shafting–Grid-Connected Oscillations Through Coordinated Optimization of Dual Damping Terms Under Frequency Coupling.
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  Data: <searchLink fieldCode="AR" term="%22Wang%2C+Zheng%22">Wang, Zheng</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lu%2C+Yimin%22">Lu, Yimin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> y.m.lu@gxu.edu.cn</i>
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  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Energies+%2819961073%29%22">Energies (19961073)</searchLink>. Mar2026, Vol. 19 Issue 5, p1224. 21p.
– Name: Subject
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  Data: *<searchLink fieldCode="DE" term="%22Subsynchronous+resonance%22">Subsynchronous resonance</searchLink><br />*<searchLink fieldCode="DE" term="%22Damping+%28Mechanics%29%22">Damping (Mechanics)</searchLink><br />*<searchLink fieldCode="DE" term="%22Optimal+control+theory%22">Optimal control theory</searchLink><br />*<searchLink fieldCode="DE" term="%22Oscillations%22">Oscillations</searchLink><br />*<searchLink fieldCode="DE" term="%22Electric+power+system+stability%22">Electric power system stability</searchLink><br />*<searchLink fieldCode="DE" term="%22Induction+generators%22">Induction generators</searchLink><br />*<searchLink fieldCode="DE" term="%22Wind+power+plants%22">Wind power plants</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Sub-synchronous oscillations (SSOs) induced by the interaction between doubly fed induction generators (DFIGs) and weak grids pose a critical threat to the grid-connected stability of DFIG-based wind power systems. In this paper, a dual-damping-term compensation filter based on the concept of motion-induced amplification (MIA), together with an optimized design method using a linear quadratic regulator (LQR), is applied to the DFIG system. The effectiveness of the proposed approach in suppressing DFIG shafting oscillations and mitigating grid-connected frequency coupling is verified, and the underlying mechanisms are thoroughly investigated. By establishing a shafting dynamics model for the DFIG and a frequency-coupled oscillation impedance model, this study focuses on revealing the differentiated impacts of the dual damping parameters ( Z p and Z q ) on system stability under two operating modes: maximum power point tracking (MPPT) and constant power operation. Stability analysis based on the generalized Nyquist criterion (GNC), together with time-domain simulations, demonstrates that coordinated optimization of the dual damping terms can effectively suppress shafting oscillations and frequency coupling, thereby significantly enhancing the grid-connected stability of DFIG systems. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.3390/en19051224
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 21
        StartPage: 1224
    Subjects:
      – SubjectFull: Subsynchronous resonance
        Type: general
      – SubjectFull: Damping (Mechanics)
        Type: general
      – SubjectFull: Optimal control theory
        Type: general
      – SubjectFull: Oscillations
        Type: general
      – SubjectFull: Electric power system stability
        Type: general
      – SubjectFull: Induction generators
        Type: general
      – SubjectFull: Wind power plants
        Type: general
    Titles:
      – TitleFull: Mechanism of Suppressing DFIG Shafting–Grid-Connected Oscillations Through Coordinated Optimization of Dual Damping Terms Under Frequency Coupling.
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          Name:
            NameFull: Wang, Zheng
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            NameFull: Lu, Yimin
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          Dates:
            – D: 01
              M: 03
              Text: Mar2026
              Type: published
              Y: 2026
          Identifiers:
            – Type: issn-print
              Value: 19961073
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              Value: 19
            – Type: issue
              Value: 5
          Titles:
            – TitleFull: Energies (19961073)
              Type: main
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