Monitoring a 5MW offshore wind energy converter—Condition parameters and triangulation based extraction of modal parameters

Häckell, Moritz; Rolfes, Raimund

doi:10.1016/j.ymssp.2013.04.004

Cited by 53 publications

(28 citation statements)

References 20 publications

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“…It can be obviously found that the harmonic components in the vibration responses did not affect the natural modal information, because the identified modal frequencies at 0.41 Hz are far from the maximum 1P harmonic frequency at 0.25 Hz at the rotating speed of 15 rpm. The similar conclusion was also proposed by Häckell, comparing the first eigenfrequency at 0.33 Hz with the harmonic frequency at 0.25 Hz [114]. It is illustrated that the measured OWTs were designed to increase the structural modal frequency or reduce the rotating speed in order to widen the frequency interval between structure and excitations.…”

Section: Modal Information Identificationsupporting

confidence: 81%

Health Monitoring and Safety Evaluation of the Offshore Wind Turbine Structure: A Review and Discussion of Future Development

et al. 2019

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With the depletion of fossil energy, offshore wind power has become an irreplaceable energy source for most countries in the world. In recent years, offshore wind power generation has presented the gradual development trend of larger capacity, taller towers, and longer blades. The more flexible towers and blades have led to the structural operational safety of the offshore wind turbine (OWT) receiving increasing worldwide attention. From this perspective, health monitoring systems and operational safety evaluation techniques of the offshore wind turbine structure, including the monitoring system category, data acquisition and transmission, feature information extraction and identification, safety evaluation and reliability analysis, and the intelligent operation and maintenance, were systematically investigated and summarized in this paper. Furthermore, a review of the current status, advantages, disadvantages, and the future development trend of existing systems and techniques was also carried out. Particularly, the offshore wind power industry will continue to develop into deep ocean areas in the next 30 years in China. Practical and reliable health monitoring systems and safety evaluation techniques are increasingly critical for offshore wind farms. Simultaneously, they have great significance for strengthening operation management, making efficient decisions, and reducing failure risks, and are also the key link in ensuring safe energy compositions and achieving energy development targets in China. The aims of this article are to inform more scholars and experts about the status of the health monitoring and safety evaluation of the offshore wind turbine structure, and to contribute toward improving the efficiency of the corresponding systems and techniques.

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Section: Modal Information Identificationsupporting

confidence: 81%

Health Monitoring and Safety Evaluation of the Offshore Wind Turbine Structure: A Review and Discussion of Future Development

et al. 2019

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“…Damgaard et al [5] performed 'rotor-stop' tests for five wind parks between 2006 and 2011 and determined the natural frequency and modal soil damping of a specific wind turbine at different soil conditions. Hackell and Rolfes [6] have extracted the modal parameters for an offshore wind turbine on a tripod structure located at German Alpha ventus wind farm. Devriendt et al [7,8] performed an overspeed stop test to estimate the overall damping of the first for-aft (FA) mode of a V90 wind turbine in the Belgian Belwind wind farm.…”

Section: Introductionmentioning

confidence: 99%

“…Identification of the modal parameters of a full-scale operating wind turbine is particularly difficult and in the research community a lot of effort still goes into the development of suitable methods to tackle this problem [6,9,10]. Classical experimental modal analysis methods cannot be applied because the input force owing to the wind and the waves cannot be measured.…”

Section: Introductionmentioning

confidence: 99%

Monitoring resonant frequencies and damping values of an offshore wind turbine in parked conditions

Devriendt¹,

Weijtjens

El-Kafafy

et al. 2014

IET Renewable Power Generation

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This study shows the first results of a long-term monitoring campaign on an offshore wind turbine in the Belgian North Sea. It focuses on the continuous monitoring of the resonant frequencies and damping values of the most dominant modes of the support structure. These parameters allow to better understand the dynamics of offshore wind turbines and are crucial in the fatigue assessment during the design phase. They can also help to minimise operation and maintenance (O&M) costs and to assess the lifetime of the offshore wind turbines structures during their operation. To do an accurate continuous monitoring of these parameters, a state-of-the-art operational modal analysis technique has been automated, so that no human-interaction is required and the system can track small changes in the dynamic behaviour of the offshore wind turbine. The study will analyse the resonant frequencies and damping values of the most dominant modes shapes while the wind turbine is in parked conditions.

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“…Damgaard et al 9 performed 'rotor-stop' tests for five wind parks for the period between 2006 and 2011 and determined the natural frequency and modal soil damping of a specific wind turbine for different soil conditions. Häckell 10 has extracted the modal parameters for an offshore wind turbine on a tripod structure located at the German Alpha ventus wind farm. Ozbek and Rixen 11 has reported the results for an onshore 2.5 MW wind turbine at both standstill and rotating conditions by using three different measurement systems, namely conventional strain gages, photogrammetry and laser interferometry.…”

Section: Introductionmentioning

confidence: 99%

The dynamics of an offshore wind turbine in parked conditions: a comparison between simulations and measurements

et al. 2014

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Offshore wind turbines are complex structures, and their dynamics can vary significantly because of changes in operating conditions, e.g., rotor-speed, pitch angle or changes in the ambient conditions, e.g., wind speed, wave height or wave period. Especially in parked conditions, with reduced aerodynamic damping forces, the response due to wave actions with wave frequencies close to the first structural resonance frequencies can be high. Therefore, this paper will present numerical simulations using the HAWC2 code to study an offshore wind turbine in parked conditions. The model has been created according to best practice and current standards based on the design of an existing Vestas V90 offshore wind turbine on a monopile foundation in the Belgian North Sea. The damping value of the model's first fore-aft mode has been tuned on the basis of measurements obtained from a long-term ambient monitoring campaign on the same wind turbine. Using the updated model of the offshore wind turbine, the paper will present some of the effects of the different design parameters and the different ambient conditions on the dynamics of an offshore wind turbine. The results from the simulations will be compared with the processed data obtained from the real measurements. The accuracy of the model will be discussed in terms of resonance frequencies, mode shapes, damping value and acceleration levels, and the limitations of the simulations in modeling of an offshore wind turbine will be addressed.

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Monitoring a 5MW offshore wind energy converter—Condition parameters and triangulation based extraction of modal parameters

Cited by 53 publications

References 20 publications

Health Monitoring and Safety Evaluation of the Offshore Wind Turbine Structure: A Review and Discussion of Future Development

Health Monitoring and Safety Evaluation of the Offshore Wind Turbine Structure: A Review and Discussion of Future Development

Monitoring resonant frequencies and damping values of an offshore wind turbine in parked conditions

The dynamics of an offshore wind turbine in parked conditions: a comparison between simulations and measurements

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