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access icon openaccess Numerical research of an effective measure for stabilising floating wind turbines in shallow water

  • Author(s): Wenxian Yang 1 ; W. Tian 1 ; Z. Peng 2 ; K. Wei 3 ; Y. Feng 4 ; Y. Qiu 4
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  • Source: Volume 2019, Issue 18, July 2019, p. 4703 – 4707
    DOI:  10.1049/joe.2018.9307 , Online ISSN 2051-3305
This is an open access article published by the IET under the Creative Commons Attribution-NonCommercial-NoDerivs License (http://creativecommons.org/licenses/by-nc-nd/3.0/)
Received 29/10/2018, Accepted 09/01/2019, Published 15/03/2019

In order to stabilise floating wind turbines, an innovative motion stabilisation measure is proposed and verified here through conducting a series of numerical researches with the aid of SESAM. In the research, the numerical model of a spar-supported 5 MW floating turbine was developed first to investigate its motion stability in different depths water and under different wave conditions. Then, a new concept of motion stabiliser is proposed, which consists of a number of heave plates that are connected to floating turbine foundation via structural arms. The influences of both the number of heave plates and their arm length on motion reduction are then investigated in order to explore an optimal design of the proposed stabiliser. Considering the dynamic motions of a floating turbine is mainly affected by sea waves, the motion stabilising capability of the proposed stabiliser is investigated over a wide range of wave period 4–36 s. It has been found that after using the proposed motion stabiliser, both the pitch and heave motions of the floating turbine are successfully limited within the most range of wave period, especially when the wave period exceeds 12 s.

Inspec keywords: hydrodynamics; plates (structures); offshore installations; wind turbines; mechanical stability; ocean waves

Other keywords: time 4.0 s to 36.0 s; wave conditions; potential motion stabilisation measure; dynamic motions; nearshore shallow water; motion stabiliser; motion stability; time 12.0 s; wave period; single heave plate; motion stabilisation results; floating wind turbine stability; power 5.0 MW; time 15.0 s to 20.0 s; numerical research; spar structure; motion stabilising capability; water depth; numerical model; heave motion; spar-supported floating turbine

Subjects: Surface waves, tides, and sea level; Applied fluid mechanics; Power and plant engineering (mechanical engineering); Buckling and instability (mechanical engineering); Fluid mechanics and aerodynamics (mechanical engineering)

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