A Novel Tension-Leg Application for Floating Offshore Wind: Targeting Lower Nacelle Motions

Melis, Cécile; Caillé, François; Perdrizet, Timothée; Poirette, Yann; Bozonnet, Pauline

doi:10.1115/omae2016-54961

Cited by 5 publications

(4 citation statements)

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“…The behavior of the floater in the model test campaign demonstrated good agreement with the analytical simulations, and the results of this model test campaign are reported elsewhere, together with the analytical modelling strategy based on the Orcaflex and DeepLines software packages, [8].…”

Section: Mooring Systemsupporting

confidence: 67%

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Adapting Tension Leg Technology to Provide an Economical Solution for Floating Wind Power

Melis

Bauduin

Wattez

et al. 2016

Day 3 Wed, May 04, 2016

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The development of floating offshore wind farms requires the parallel development of suitable floaters to support the wind turbines. These floaters must be economic and must also exhibit good motion characteristics to limit the accelerations and inclinations imposed on the turbines during operation. This paper reviews the required characteristics of these floaters, addressing the requirements of fabrication, turbine integration, tow to site, and offshore installation, as well as the required behavior of the floater once installed. The benefits of an integrated design approach considering all of the above is demonstrated, and consideration is given to the industrialization of the production process for large numbers of floaters for full-scale wind farms.Based upon this review of requirements, an innovative light weight structural solution incorporating tensioned mooring legs has been developed as an economic solution for the floater. The modularity of the design facilitates construction, and offshore installation can be accomplished using standard anchor handling vessel (AHV) means. The floater design exhibits low turbine inclinations and low accelerations due to a combination of its mooring arrangement and its high degree of transparency to waves, which reduces fatigue loads and maintenance issues on the turbine.The floater behavior during towing to site and in the installed condition is described, and key performance characteristics are reported based on analytical simulations and model tests results conducted at 1:40 scale.The paper seeks to clarify the key factors to be considered in developing a floater to support a wind turbine, and to propose a solution that achieves good motion characteristics whilst satisfying the economic constraints of wind farm development.

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Section: Mooring Systemsupporting

confidence: 67%

“…The environmental conditions used for the design of the 5MW wind turbine floater are detailed in [8].…”

Section: Mw Wt Floater Designmentioning

confidence: 99%

Adapting Tension Leg Technology to Provide an Economical Solution for Floating Wind Power

Melis

Bauduin

Wattez

et al. 2016

Day 3 Wed, May 04, 2016

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“…Therefore, this optimality cannot be found when the surge or pitch RAO is sought to be minimized. The same idea inspired the developers of a TLP platform to arrange the taut mooring lines, such that the system is forced to rotate about the hub, see [62]. The fact that this behavior can be obtained for semi-submersibles has not been published yet.…”

Section: Harmonic Response To Wind and Wavesmentioning

confidence: 99%

Semi-submersible wind turbine hull shape design for a favorable system response behavior

Lemmer

Müller

et al. 2020

Marine Structures

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Floating offshore wind turbines are a novel technology, which has reached, with the first wind farm in operation, an advanced state of development. The question of how floating wind systems can be optimized to operate smoothly in harsh wind and wave conditions is the subject of the present work. An integrated optimization was conducted, where the hull shape of a semi-submersible, as well as the wind turbine controller were varied with the goal of finding a cost-efficient design, which does not respond to wind and wave excitations, resulting in small structural fatigue and extreme loads.The optimum design was found to have a remarkably low tower-base fatigue load response and small rotor fore-aft amplitudes. Further investigations showed that the reason for the good dynamic behavior is a particularly favorable response to first-order wave loads: The floating wind turbine rotates in pitchdirection about a point close to the rotor hub and the rotor fore-aft motion is almost unaffected by the wave excitation. As a result, the power production and the blade loads are not influenced by the waves. A comparable effect was so far known for Tension Leg Platforms but not for semi-submersible wind turbines. The methodology builds on a low-order simulation model, coupled to a parametric panel code model, a detailed viscous drag model and an individually tuned blade pitch controller. The results are confirmed by the higher-fidelity model FAST. A new indicator to express the optimal behavior through a single design criterion has been developed.

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“…Therefore, in order to meet the development needs for offshore wind energy in the southeastern coastal area, a new wind turbine foundation that is suitable for water depths less than 100 m becomes a big strategic demand in China. Many efforts have been made to invent new types of FOWTs in order to reduce the draft [13][14][15][16][17]. According to numerical simulations and experimental tests, the dynamic performance of these designs has been validated, but their feasibilities in shallow water are not fully investigated.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response of Articulated Offshore Wind Turbines under Different Water Depths

Zhang¹,

Yang²,

Li³

et al. 2020

Energies

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Focusing on the transitional depth offshore area from 50 m to 75 m, types of articulated foundations are proposed for supporting the NREL 5 MW offshore wind turbine. To investigate the dynamic behaviors under various water depths, three articulated foundations were adopted and numerical simulations were conducted in the time domain. An in-house code was chosen to simulate the dynamic response of the articulated offshore wind turbine. The aerodynamic load on rotating blades and the wind pressure load on tower are calculated based on the blade element momentum theory and the empirical formula, respectively. The hydrodynamic load is simulated by 3D potential flow theory. The motions of foundation, the aerodynamic performance of the wind turbine, and the loads on the articulated joint are documented and compared in different cases. According to the simulation, all three articulated offshore wind turbines show great dynamic performance and totally meet the requirement of power generation under the rated operational condition. Moreover, the comparison is based on time histories and spectra among these responses. The result shows that dynamic responses of the shallower one oscillate more severely compared to the other designs.

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A Novel Tension-Leg Application for Floating Offshore Wind: Targeting Lower Nacelle Motions

Cited by 5 publications

References 0 publications

Adapting Tension Leg Technology to Provide an Economical Solution for Floating Wind Power

Adapting Tension Leg Technology to Provide an Economical Solution for Floating Wind Power

Semi-submersible wind turbine hull shape design for a favorable system response behavior

Dynamic Response of Articulated Offshore Wind Turbines under Different Water Depths

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