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Power Quality‐Oriented Multiloop Design of Floating Wind Turbines Pitch Control.

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Title: Power Quality‐Oriented Multiloop Design of Floating Wind Turbines Pitch Control.
Authors: De Pascali, Marco1 (AUTHOR) marco.depascali@polimi.it, Fontanella, Alessandro1 (AUTHOR), Muggiasca, Sara1 (AUTHOR), Belloli, Marco1 (AUTHOR), Turolla, Axel2 (AUTHOR), Zampato, Massimo2 (AUTHOR)
Source: Wind Energy. Apr2026, Vol. 29 Issue 4, p1-15. 15p.
Subjects: Closed loop system stability, Wind turbines, Feedback control systems, Optimal control theory, Power supply quality
Abstract: Floating offshore wind turbines (FOWTs) face inherent control limitations in above‐rated operating conditions due to right‐half‐plane zeros in the blade‐pitch‐to‐rotor‐speed dynamics, which restrict achievable control bandwidth and may lead to closed‐loop instability. Conventional mitigation strategies based on controller detuning preserve stability at the expense of performance, while auxiliary feedback loops improve regulation but introduce additional dynamic coupling that complicates tuning and gain scheduling. This work proposes a novel gain‐scheduling methodology based on an output‐feedback linear quadratic regulator (LQR) formulation for pitch control of FOWT. The approach leverages a reduced‐order linear model capturing the dominant coupled dynamics of the drivetrain and platform pitch motion and synthesizes optimal gains scheduled as functions of operating conditions. The resulting gains are directly mapped onto the standard Reference Open‐Source Controller (ROSCO) pitch control parameters, without modifying the controller structure or introducing additional feedback loops. Nonlinear aero‐servo‐hydro‐elastic simulations performed with OpenFAST on the IEA 15‐MW reference turbine demonstrate that the proposed approach significantly improves rotor speed regulation and power quality while enhancing closed‐loop stability compared with conventional detuning strategies. These improvements are accompanied by reduced fatigue loads on the tower and blades across a wide range of wind, turbulence, and sea‐state conditions, highlighting the effectiveness and practical applicability of the proposed methodology. [ABSTRACT FROM AUTHOR]
Copyright of Wind Energy is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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An: 192374545
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  Label: Title
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  Data: Power Quality‐Oriented Multiloop Design of Floating Wind Turbines Pitch Control.
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  Data: <searchLink fieldCode="AR" term="%22De Pascali%2C+Marco%22">De Pascali, Marco</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> marco.depascali@polimi.it</i><br /><searchLink fieldCode="AR" term="%22Fontanella%2C+Alessandro%22">Fontanella, Alessandro</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Muggiasca%2C+Sara%22">Muggiasca, Sara</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Belloli%2C+Marco%22">Belloli, Marco</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Turolla%2C+Axel%22">Turolla, Axel</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zampato%2C+Massimo%22">Zampato, Massimo</searchLink><relatesTo>2</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Wind+Energy%22">Wind Energy</searchLink>. Apr2026, Vol. 29 Issue 4, p1-15. 15p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Closed+loop+system+stability%22">Closed loop system stability</searchLink><br /><searchLink fieldCode="DE" term="%22Wind+turbines%22">Wind turbines</searchLink><br /><searchLink fieldCode="DE" term="%22Feedback+control+systems%22">Feedback control systems</searchLink><br /><searchLink fieldCode="DE" term="%22Optimal+control+theory%22">Optimal control theory</searchLink><br /><searchLink fieldCode="DE" term="%22Power+supply+quality%22">Power supply quality</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Floating offshore wind turbines (FOWTs) face inherent control limitations in above‐rated operating conditions due to right‐half‐plane zeros in the blade‐pitch‐to‐rotor‐speed dynamics, which restrict achievable control bandwidth and may lead to closed‐loop instability. Conventional mitigation strategies based on controller detuning preserve stability at the expense of performance, while auxiliary feedback loops improve regulation but introduce additional dynamic coupling that complicates tuning and gain scheduling. This work proposes a novel gain‐scheduling methodology based on an output‐feedback linear quadratic regulator (LQR) formulation for pitch control of FOWT. The approach leverages a reduced‐order linear model capturing the dominant coupled dynamics of the drivetrain and platform pitch motion and synthesizes optimal gains scheduled as functions of operating conditions. The resulting gains are directly mapped onto the standard Reference Open‐Source Controller (ROSCO) pitch control parameters, without modifying the controller structure or introducing additional feedback loops. Nonlinear aero‐servo‐hydro‐elastic simulations performed with OpenFAST on the IEA 15‐MW reference turbine demonstrate that the proposed approach significantly improves rotor speed regulation and power quality while enhancing closed‐loop stability compared with conventional detuning strategies. These improvements are accompanied by reduced fatigue loads on the tower and blades across a wide range of wind, turbulence, and sea‐state conditions, highlighting the effectiveness and practical applicability of the proposed methodology. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Wind Energy is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1002/we.70107
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      – Code: eng
        Text: English
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        PageCount: 15
        StartPage: 1
    Subjects:
      – SubjectFull: Closed loop system stability
        Type: general
      – SubjectFull: Wind turbines
        Type: general
      – SubjectFull: Feedback control systems
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      – SubjectFull: Optimal control theory
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      – SubjectFull: Power supply quality
        Type: general
    Titles:
      – TitleFull: Power Quality‐Oriented Multiloop Design of Floating Wind Turbines Pitch Control.
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            NameFull: De Pascali, Marco
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            NameFull: Fontanella, Alessandro
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            NameFull: Muggiasca, Sara
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            NameFull: Belloli, Marco
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            NameFull: Turolla, Axel
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            – D: 01
              M: 04
              Text: Apr2026
              Type: published
              Y: 2026
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