Parametric Study of a Counter Weight Suspension System for the TetraSpar Floating Wind Turbine

Brandon, Pereyra,; Jiang, Zhiyu; Gao, Zhen; Andersen, Morten Thøtt; Stiesdal, Henrik

doi:10.1115/iowtc2018-1079

Cited by 11 publications

(6 citation statements)

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“…A comparable design of reduced draft was presented in [29] with a focus on seakeeping of the floater and marine operations. The peculiar loads of a steel semi-submersible with submerged counter-weight are calculated in [30] with a focus on the cables, sustaining the counter-weight. A semi-submersible for a very large wind turbine was recently presented in [22].…”

Section: Floating Wind Turbine Designmentioning

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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Section: Floating Wind Turbine Designmentioning

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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“…The latter has been particularly focused on the dynamic response of the concept. Several experimental campaigns have tested the coupled hydro-and aerodynamic response [12][13][14], while numerical models have been used to test various design aspects and response of the FOWT foundation [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Investigation of Prevalent Hydrodynamic Modelling Approaches for Floating Offshore Wind Turbine Foundations: A TetraSpar Case Study

Thomsen

Têtu

Stiesdal³

2021

JMSE

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Numerical models have been used extensively in the design process of the TetraSpar floating offshore wind turbine (FOWT) foundation to optimize and investigate the influence from a number of structural and environmental conditions. In traditional offshore design, either the Morison approach or a linear boundary element method (BEM) is applied to investigate the hydrodynamic loads on a structure. The present study investigated and compared these two methods and evaluated their applicability on the TetraSpar FOWT concept. Furthermore, a hybrid model containing load contributions from both approaches was evaluated. This study focuses on motion response. In the evaluation, hydrodynamic data from BEM codes are applied, while the commercial software package OrcaFlex is utilized for time series simulations of the coupled structure. The investigation highlights the difference between the modelling approaches and the importance of particularly drag and inertia contributions. By optimizing the input coefficients, reasonable agreement between the models can be achieved.

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“…In summer 2021, a 3.6 MW demonstrator completed manufacturing in Denmark and was installed off the Norwegian coast [8]. During the design phase of the concept, several experimental test campaigns and studies were conducted [10][11][12], while the final design highly relied on numerical modeling [13][14][15]. Naturally, this resembles the procedure applied by most other FOWT developers and designers of offshore structures and is recommended by most design standards such as DNVGL-OS-E301 [16], DNVGL-RP-C205 [17], IEC TS 61400-3-2:2019 [18], and DNVGL-ST-0119 [19].…”

Section: Introductionmentioning

confidence: 99%

Modeling the TetraSpar Floating Offshore Wind Turbine Foundation as a Flexible Structure in OrcaFlex and OpenFAST

et al. 2021

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Floating offshore wind turbine technology has seen an increasing and continuous development in recent years. When designing the floating platforms, both experimental and numerical tools are applied, with the latter often using time-domain solvers based on hydro-load estimation from a Morison approach or a boundary element method. Commercial software packages such as OrcaFlex, or open-source software such as OpenFAST, are often used where the floater is modeled as a rigid six degree-of-freedom body with loads applied at the center of gravity. However, for final structural design, it is necessary to have information on the distribution of loads over the entire body and to know local internal loads in each component. This paper uses the TetraSpar floating offshore wind turbine design as a case study to examine new modeling approaches in OrcaFlex and OpenFAST that provide this information. The study proves the possibility of applying the approach and the extraction of internal loads, while also presenting an initial code-to-code verification between OrcaFlex and OpenFAST. As can be expected, comparing the flexible model to a rigid-body model proves how motion and loads are affected by the flexibility of the structure. OrcaFlex and OpenFAST generally agree, but there are some differences in results due to different modeling approaches. Since no experimental data are available in the study, this paper only forms a baseline for future studies but still proves and describes the possibilities of the approach and codes.

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Parametric Study of a Counter Weight Suspension System for the TetraSpar Floating Wind Turbine

Cited by 11 publications

References 0 publications

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

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

A Comparative Investigation of Prevalent Hydrodynamic Modelling Approaches for Floating Offshore Wind Turbine Foundations: A TetraSpar Case Study

Modeling the TetraSpar Floating Offshore Wind Turbine Foundation as a Flexible Structure in OrcaFlex and OpenFAST

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