Preprints
https://doi.org/10.5194/wes-2023-180
https://doi.org/10.5194/wes-2023-180
16 Jan 2024
 | 16 Jan 2024
Status: a revised version of this preprint was accepted for the journal WES and is expected to appear here in due course.

The potential of wave feedforward control for floating wind turbines: A wave tank experiment

Amr Hegazy, Peter Naaijen, Vincent Leroy, Félicien Bonnefoy, Yves Pérignon, and Jan-Willem van Wingerden

Abstract. Floating wind energy has attracted substantial interest since it enables the deployment of renewable wind energy in deeper waters. Compared to the bottom-fixed turbines, floating wind turbines are subjected to more disturbances, predominantly from waves acting on the platform. Wave disturbances cause undesired oscillations in rotor speed and increase structural loading. This paper focuses on investigating the potential of using wave preview measurement in the controller system labeled as wave feedforward control. Two wave feedforward controllers were designed: one to reduce generator power oscillations, and the other one to minimize the platform pitch motion. In this study, a software-in-the-loop wave tank experiment is presented for the purpose of investigating the potential of wave feedforward control for floating wind turbines. In the experiment, a 1:40 scaled model of the DTU 10 MW reference wind turbine is used on top of a spar platform, with the reference closed-loop functionalities. Different environmental conditions, including wind speed, significant wave height, turbulence intensity and wave spreading, were applied during the experiments to test the control performance, and their effect on the turbine dynamics in general. It was found that the feedforward controller for rotor speed reduces the power fluctuations properly with a fair control effort, while the one for platform pitch motion requires huge actuation duty. It was concluded that wind turbulence has more dominance on the global dynamic response than waves.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
Amr Hegazy, Peter Naaijen, Vincent Leroy, Félicien Bonnefoy, Yves Pérignon, and Jan-Willem van Wingerden

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wes-2023-180', Anonymous Referee #1, 14 Mar 2024
  • RC2: 'Comment on wes-2023-180', Anonymous Referee #2, 21 Mar 2024
  • AC1: 'Response to referees', Amr Hegazy, 14 May 2024

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wes-2023-180', Anonymous Referee #1, 14 Mar 2024
  • RC2: 'Comment on wes-2023-180', Anonymous Referee #2, 21 Mar 2024
  • AC1: 'Response to referees', Amr Hegazy, 14 May 2024
Amr Hegazy, Peter Naaijen, Vincent Leroy, Félicien Bonnefoy, Yves Pérignon, and Jan-Willem van Wingerden
Amr Hegazy, Peter Naaijen, Vincent Leroy, Félicien Bonnefoy, Yves Pérignon, and Jan-Willem van Wingerden

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Short summary
Successful wave tank experiments were conducted to evaluate the feedforward control strategy benefits in terms of the structural loads and the power quality of the floating wind turbine components. In short, the wave feedforward control strategy is effective when it comes to alleviating the effects of the wave forces on the FOWT, whereas, wave FF control requires significant amount of actuation to minimise the platform pitch motion, which makes such a technology unfavourable for that objective.
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