Summary and Conclusions of the Full Life-Cycle of the WindFloat FOWT Prototype Project

Roddier, Dominique; Cermelli, Christian; Aubault, Alexia; Peiffer, Antoine

doi:10.1115/omae2017-62561

Cited by 15 publications

(10 citation statements)

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“…Table 2 Indicative natural frequencies (Hz) and natural periods (s) of "rigid-body motion modes" of floating offshore wind turbines based on Refs. [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] 10 Journal of Offshore Mechanics and Arctic Engineering OCTOBER 2020, Vol. 142 / 052002-7…”

Section: Assessment Of Dynamic Behavior (Determination Of Load Effects)mentioning

confidence: 99%

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Recent Advances in Integrated Response Analysis of Floating Wind Turbines in a Reliability Perspective

Moan

Gao

Bachynski

et al. 2020

Journal of Offshore Mechanics and Arctic Engineering

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Offshore wind provides an important source of renewable energy. While wind turbines fixed to the seabed in shallow water have already been industrialized, floating wind turbines are still at an early stage of development. The cost of wind power is decreasing fast. Yet, the main challenges, especially for novel floating wind turbine concepts, are to increase reliability and reduce costs. The reliability perspective here refers to the lifecycle integrity management of the system to ensure reliability by actions during design, fabrication, installation, operation, and decommissioning. The assessment should be based on response analysis that properly accounts for the effect of different sub-systems (rotor, drivetrain, tower, support structure, and mooring) on the system behavior. Moreover, the load effects should be determined so as to be proper input to the integrity check of these sub-systems. The response analysis should serve as the basis for design and managing inspections and monitoring, with due account of inherent uncertainties. In this paper, recent developments of methods for numerical and experimental response assessment of floating wind turbines are briefly described in view of their use to demonstrate system integrity in design as well as during operation to aid inspection and monitoring. Typical features of offshore wind turbine behavior are also illustrated through some numerical case studies.

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Section: Assessment Of Dynamic Behavior (Determination Of Load Effects)mentioning

confidence: 99%

“…[20][21][22][23][24]. The first small wind farm of floating turbines was opened in the fall of 2017 (Equinor 5 ) and others are emerging [25]. While most studies have involved HAWT also some research has been done on vertical axis wind turbines (VAWTs) on different support structures [26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Integrated Response Analysis of Floating Wind Turbines in a Reliability Perspective

Moan

Gao

Bachynski

et al. 2020

Journal of Offshore Mechanics and Arctic Engineering

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“…Semisubmersibles or barges achieve the hydrostatic restoring moment from the waterplane area (barge effect), together with gravitational forces. To date, first full-scale prototype tests of FOWTs were successfully completed, such as Statoil's Hywind spar with a 2.3 MW turbine [23], Principle Power's WindFloat [71] with a 2 MW turbine, or the Japanese Kabashima project with a 2 MW turbine on two different platform types [86].…”

Section: Introductionmentioning

confidence: 99%

Multibody modeling for concept-level floating offshore wind turbine design

Lemmer

Luhmann³

et al. 2020

Multibody Syst Dyn

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Existing Floating Offshore Wind Turbine (FOWT) platforms are usually designed using static or rigid-body models for the concept stage and, subsequently, sophisticated integrated aero-hydro-servo-elastic models, applicable for design certification. For the new technology of FOWTs, a comprehensive understanding of the system dynamics at the concept phase is crucial to save costs in later design phases. This requires low-and medium-fidelity models. The proposed modeling approach aims at representing no more than the relevant physical effects for the system dynamics. It consists, in its core, of a flexible multibody system. The applied Newton-Euler algorithm is independent of the multibody layout and avoids constraint equations. From the nonlinear model a linearized counterpart is derived. First, to be used for controller design and second, for an efficient calculation of the response to stochastic load spectra in the frequency-domain. From these spectra the fatigue damage is calculated with Dirlik's method and short-term extremes by assuming a normal distribution of the response. The set of degrees of freedom is reduced, with a response calculated only in the two-dimensional plane, in which the aligned wind and wave forces act. The aerodynamic model is a quasistatic actuator disk model. The hydrodynamic model includes a simplified radiation model, based on potential flow-derived added mass coefficients and nodal viscous drag coefficients with an approximate representation of the second-order slow-drift forces. The verification through a comparison of the nonlinear and the linearized model against a higher-fidelity model and experiments shows that even with the simplifications, the system response magnitude at the system eigenfrequencies and the forced response magnitude to wind and wave forces can be well predicted. One-hour simulations complete in about 25 seconds and even less in the case of the frequency-domain model. Hence, large sensitivity studies and even multidisciplinary optimizations for systems engineering approaches are possible.

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“…At this point it is important to consider the technical progress made in developing floating wind structures [96,97], which enables the installation of wind turbines at greater depths. In fact, a floating offshore wind turbine prototype has been tested for five years in the north of Portugal, close to the region under study [98]. The installation of a floating OWF in the north of at a depth of 100 m and 20 km from the coast is planned for 2018.…”

Section: Resultsmentioning

confidence: 99%

Development of Offshore Wind Power: Contrasting Optimal Wind Sites with Legal Restrictions in Galicia, Spain

et al. 2018

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The region of Galicia, in the northwest of the Iberian Peninsula, has a high wind potential for the installation of offshore wind farms (OWFs) in many areas of its surrounding marine waters. However, legal restrictions derived from the protection of other interests that converge in the marine environment (such as fishing, navigation, and biodiversity conservation) must be considered, along with technical limitations resulting from water depth. This study is aimed at analysing legal restrictions on the installation of OWFs in Galician waters and at identifying those zones of less conflict where the wind power density (WPD) is greater and the depths and distances from the coast are technically feasible given the current status of technology in Europe. To do this, a legal study was performed of both the strategic environmental assessment of the Spanish coast and the regulations of the different marine sectors at European, international, national, and regional levels. In addition, the WPD along the northwestern area of the Iberian Peninsula and Europe was calculated, and an analysis of maximum and average depths and distances from the coast of planned and installed OWFs in Europe was made. Two main zones without legal and technical restrictions were identified in the northeastern corner of Galicia and in the south of the Vigo estuary. The greatest WPD was identified in the northwestern zone, from Cape Finisterre to Cape Ortegal, where there are small sites without legal or technical restrictions that are near several protected zones (such as a marine reserve, a special protected area, and a wetland and its buffer zone), making necessary a deeper analysis of the specific impacts of each OWF project in the Environmental Impact Assessment.

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Summary and Conclusions of the Full Life-Cycle of the WindFloat FOWT Prototype Project

Cited by 15 publications

References 0 publications

Recent Advances in Integrated Response Analysis of Floating Wind Turbines in a Reliability Perspective

Recent Advances in Integrated Response Analysis of Floating Wind Turbines in a Reliability Perspective

Multibody modeling for concept-level floating offshore wind turbine design

Development of Offshore Wind Power: Contrasting Optimal Wind Sites with Legal Restrictions in Galicia, Spain

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