21 Dec 2022
21 Dec 2022
Status: this preprint is currently under review for the journal WES.

Damping analysis of Floating Offshore Wind Turbine (FOWT): a new control strategy reducing the platform vibrations

Matteo Capaldo1,2 and Paul Mella2 Matteo Capaldo and Paul Mella
  • 1TotalEnergies OneTech, Palaiseau, France
  • 2Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France

Abstract. In this paper, the coupled dynamics of the floating platform and the wind turbine rotor is analysed. In particular, the damping is explicitly derived from the coupled equations of rotor and floating platform. The analysis of the damping leads to the study of the instability phenomena obtaining the explicit conditions that lead to the Non Minimum Phase Zero (NMPZ). Two NMPZs are analysed, one related to the rotor dynamics and the other one to the platform pitch dynamics. The latter is a novelty and an explicit condition is introduced in this work for its verification. In the second part of the paper, from the analysis of the damping of the floating platform, a new strategy for the control of Floating Offshore Wind Turbines (FOWTs) is proposed. This strategy allows one to impose to the controller an explicit level of damping in the platform pitch motion without changing the period of platform pitching. Finally the new strategy is compared to the one without compensation by performing aero-hydro-servo-elastic numerical simulations of a reference FOWT. Generated power, movements, blade pitch and tower base fatigue are compared showing that the new control strategy can reduce fatigue in the structure without affecting the power production.

Matteo Capaldo and Paul Mella

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wes-2022-109', Anonymous Referee #1, 17 Jan 2023
  • RC2: 'Comment on wes-2022-109', Anonymous Referee #2, 28 Jan 2023
  • RC3: 'Comment on wes-2022-109', Anonymous Referee #3, 31 Jan 2023

Matteo Capaldo and Paul Mella

Matteo Capaldo and Paul Mella


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Short summary
The controller impact the movements, loads and yield of wind turbines. Standard controllers are not adapted for floating and they can lead to under-performances and over-loads. New control strategies, considering the coupling between the floating dynamics and the rotor dynamics, are necessary to reduce platform movements and improving performances. This work proposes a new control strategy adapted to floating wind, showing a reduction in loads without affecting the power production.