Preprints
https://doi.org/10.5194/wes-2022-86
https://doi.org/10.5194/wes-2022-86
 
11 Oct 2022
11 Oct 2022
Status: this preprint is currently under review for the journal WES.

Platform yaw drift in upwind floating wind turbines with single-point-mooring system and its mitigation by individual pitch control

Iñaki Sandua-Fernández1, Felipe Vittori1, Raquel Martín-San-Román1,2, Irene Eguinoa1, and José Azcona-Armendáriz1 Iñaki Sandua-Fernández et al.
  • 1Wind Energy Department, Centro Nacional de Energías Renovables (CENER), Sarriguren, Spain
  • 2DAVE/UPM, E.T.S.I. Aeronáutica y del Espacio, Universidad Politécnica de Madrid, Madrid, Spain

Abstract. This work demonstrates the feasibility of an individual pitch control strategy based on nacelle yaw misalignment measurements to mitigate the platform yaw drift in upwind floating offshore wind turbines, which is caused by the vertical moment produced by the rotor. This moment acts on the platform yaw degree of freedom, being of great importance in systems that have low yaw stiffness. Among them, single-point-mooring platforms are one of the most important ones. During the last years, several floating wind turbine concepts with single-point-mooring systems have been proposed, which can theoretically dispense with yaw mechanism, due to their ability to weather-vane. However, in this paper it is proven that the vertical moment overcomes the orienting ability, causing the yaw drift. With the intention of reducing the induced yaw response of a single-point-mooring floating wind turbine, an individual pitch control strategy based on nacelle yaw misalignment is applied, which introduces a counteracting moment. The control strategy is validated by numerical simulations using the NREL 5 MW wind turbine mounted on a single-point-mooring version of the DeepCwind OC4 floating platform, to demonstrate that it can mitigate the yaw drift and therefore maintain the wind turbine rotor aligned with the wind.

Iñaki Sandua-Fernández et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on wes-2022-86: Other works on the yaw mechanism of single-point-pooring based FOWTs', Christian Schulz, 24 Oct 2022
    • AC1: 'Reply on CC1', Iñaki Sandua, 27 Oct 2022
  • RC1: 'Comment on wes-2022-86', Anonymous Referee #1, 07 Nov 2022
    • AC2: 'Reply on RC1', Iñaki Sandua, 30 Nov 2022
  • RC2: 'Comment on wes-2022-86', Anonymous Referee #2, 11 Nov 2022
    • AC3: 'Reply on RC2', Iñaki Sandua, 30 Nov 2022

Iñaki Sandua-Fernández et al.

Iñaki Sandua-Fernández et al.

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Short summary
This work analyses in detail the causes of the yaw drift in floating offshore wind turbines with single-point-mooring system, induced by an upwind wind turbine. The ability of an IPC strategy based on yaw misalignment is demonstrated through simulations using the NREL 5 MW wind turbine mounted on a single-point mooring version of the DeepCwind OC4 floating platform. This effect is considered to be relevant for all single-point-moored concepts.