Tuning of Nacelle Feedback Gains for Floating Wind Turbine Controllers Using a Two-DOF Model: Paper No. OMAE2020-18770

Eben Lenfest, Andrew Goupee, Alan Wright, Nikhar Abbas

Research output: Contribution to conferencePaper

8 Scopus Citations

Abstract

Designing a collective blade pitch controller for floating offshore wind turbines (FOWTs) poses unique challenges due to the interaction of the controller with the dynamics of the platform. The controller must also handle the competing objectives of power production performance and fatigue load management. Existing solutions either detune the controller with the result of slowed response, make use of complicated tuning methods, or incorporate a nacelle velocity feedback gain. With the goal of developing a simple control tuning method for the general FOWT researcher that is easily extensible to a wide array of turbine and hull configurations, this last idea is built upon by proposing a simple tuning strategy for the feedback gain. This strategy uses a two degree-of-freedom (DoF) turbine model that considers tower-top fore-aft and rotor angular displacements. For evaluation, the nacelle velocity term is added to an existing gain scheduled proportional-integral controller as a proportional gain. The modified controller is then compared to baseline land-based and detuned controllers on an example system for several load cases. First-pass results are favorable, demonstrating how researchers can use the proposed tuning method to efficiently schedule gains for adequate controller performance as they investigate new FOWT configurations.
Original languageAmerican English
Number of pages10
DOIs
StatePublished - 2020
EventASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering -
Duration: 3 Aug 20207 Aug 2020

Conference

ConferenceASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering
Period3/08/207/08/20

Bibliographical note

See NREL/CP-5000-76558 for preprint

NREL Publication Number

  • NREL/CP-5000-79139

Keywords

  • blade collective pitch
  • floating offshore wind turbine
  • OpenFAST

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