Lifting Line Free Wake Vortex Filament Method for the Evaluation of Floating Offshore Wind Turbines: First Step — Validation for Fixed Wind Turbines

Martín-San-Román, Raquel; Azcona, José; Cuerva-Tejero, Alvaro

doi:10.1115/iowtc2019-7540

Cited by 5 publications

(7 citation statements)

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“…In this study, the INNWIND 10MW offshore wind turbine [9] supported by the SATH platform, designed by Saitec Offshore Technologies [10], have been used for the analysis. This wind turbine is a three bladed upwind system with 10 MW rated power.…”

Section: Floating Wind Turbinementioning

confidence: 99%

“…The potential flow frequency domain solution was computed with WAMIT version 6.4 [16] and then transferred to time domain by HydroDyn. The viscous effects, that are neglected by the potential theory but can contribute to the system damping, were included using the Morison equation [10].…”

Section: Numerical Modelmentioning

confidence: 99%

“…This study considers a location in the Northern coast of Scotland that was selected as a suitable location for floating offshore turbines in the Arcwind project [1]. The available metocean data for this location, calculated in the Arcwind project [10], includes wave occurrences in scatter tables with combined H S and T P probabilities for each mean wind speed, covering the full range of wind speeds. The total wave occurrences are 16043.…”

Section: Met-ocean Data Processingmentioning

confidence: 99%

“…Table 1. Arcwind project site 16-18 m/s wind speed interval wave measurements scatter table (Met-A metocean data example) [10]. Table 2.…”

Section: Met-ocean Data Processingmentioning

confidence: 99%

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Study of the influence of met-ocean data in fatigue loads calculations of a floating offshore wind turbine

Lizarraga-Saenz

Artal-García

Martín-San-Román

et al. 2022

J. Phys.: Conf. Ser.

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The design of a floating offshore wind turbine (FOWT) requires the computation of loads with time domain simulations that depend heavily on the metocean conditions of the site. Guidelines, such as IEC 61400-3, recommend the use of scatter tables with the combined probability of the significant wave height (Hs) and peak period (Tp) as a function of the mean wind speed. Nevertheless, at early engineering phases it may be difficult to obtain the adequate environmental wind-wave data where both parameters are correlated for the site of interest. The main objective of this work is to assess the influence of neglecting or not the correlation between wind speed and wave data in the resulting fatigue Damage Equivalent Load (DEL) for different FOWT components. The analysis is performed through the comparison of the fatigue loads obtained for correlated and non correlated wind-wave data. Results show that fatigue loads are very similar for both data sets at the rotor loads, and present slight differences, at mooring tensions and tower base. The use of a simpler metocean data, where wave height and period occurrences are given independently of the wind speed, might be a sufficient solution for initial fatigue load estimations.

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Section: Floating Wind Turbinementioning

confidence: 99%

Section: Numerical Modelmentioning

confidence: 99%

Section: Met-ocean Data Processingmentioning

confidence: 99%

“…Table 1. Arcwind project site 16-18 m/s wind speed interval wave measurements scatter table (Met-A metocean data example) [10]. Table 2.…”

Section: Met-ocean Data Processingmentioning

confidence: 99%

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Study of the influence of met-ocean data in fatigue loads calculations of a floating offshore wind turbine

Lizarraga-Saenz

Artal-García

Martín-San-Román

et al. 2022

J. Phys.: Conf. Ser.

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“…This happens because Blade Element Momentum Theory (BEMT) (Sørensen, 2016), which is the most widely aerodynamic model used in the wind energy industry, presents limitations when predicting loads in situations with large yaw or tilt misalignment between wind and rotor, mainly because the root vortex is not well modelled (Sant, 2007;Rahimi et al, 2016;Gupta and Leishman, 2005). The FVM model implemented in AeroVIEW has been validated previously in yaw misaligned conditions (Martín-San-Román et al, 2019 and allows an accurate inclusion of the effect of both the root vortex and the blade tip vortex in both aligned and misaligned conditions.…”

Section: Introductionmentioning

confidence: 99%

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

Sandua-Fernández

Vittori²,

Martín-San-Román³

et al. 2022

Preprint

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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.

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Influence of lateral rotor spacing on the benefits in power generated by multi-rotor configurations

Martín-San-Román

Benito-Cia²,

Azcona³

et al. 2022

J. Phys.: Conf. Ser.

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In this work, an analysis of the rotor wakes interaction for different array configurations of onshore wind turbines, has been made using CENER’s in-house aerodynamic module, called AeroVIEW. The study focuses on how the distance between rotors affects the increases in power and thrust obtained by configurations with more than one laterally aligned rotor. Two configurations of laterally aligned multi wind turbines of NREL 5-MW type, operating at 8 m/s wind speed and 9.21 rpm, have been analyzed. The first one consists of 5 wind turbines and the second one consists of 2 wind turbines. These configurations have been studied for different separation distances between the rotors hubs, between 1.1 diameters and 3 diameters. The increases obtained in power with AeroVIEW are in line to the results of high fidelity tools found in the literature. The results show a higher increment of power with lower separation distances. Moreover, this beneficial effect on the power generated, has a counterpart in the average thrust, whose increase is around half of the power increase.

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Lifting Line Free Wake Vortex Filament Method for the Evaluation of Floating Offshore Wind Turbines: First Step — Validation for Fixed Wind Turbines

Cited by 5 publications

References 0 publications

Study of the influence of met-ocean data in fatigue loads calculations of a floating offshore wind turbine

Study of the influence of met-ocean data in fatigue loads calculations of a floating offshore wind turbine

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

Influence of lateral rotor spacing on the benefits in power generated by multi-rotor configurations

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