Optimal sensor placement for parameter estimation and virtual sensing of strains on an offshore wind turbine considering sensor installation cost

The experimental proof of the floating wind turbine has been started off Goto Islands in Japan. Furthermore, the project of floating wind farm is afoot off Fukushima Prof. in north eastern part of Japan. It is essential for realization of the floating wind farm to comprehend its safety, electric generating property and motion in waves and wind. The scale model experiments are effective to catch the characteristic of floating wind turbines. Authors have mainly carried out scale model experiments with wind turbine models on SPAR buoy type floaters. The wind turbine models have blade-pitch control mechanism and authors focused attention on the effect of blade-pitch control on both the motion of floater and fluctuation of rotor speed. In this paper, the results of scale model experiments are discussed from the aspect of motion of floater and the effect of blade-pitch control.

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Experimental investigation into the dynamic behavior of a floating offshore wind turbine stabilized via a suspended counterweight

Ocean Engineering ◽

10.1016/j.oceaneng.2021.108906 ◽

2021 ◽

Vol 228 ◽

pp. 108906

Author(s):

Jacob C. Ward ◽

Andrew J. Goupee ◽

Anthony M. Viselli ◽

Habib J. Dagher

Keyword(s):

Experimental Investigation ◽

Wind Turbine ◽

Dynamic Behavior ◽

Offshore Wind ◽

Offshore Wind Turbine ◽

Floating Offshore Wind Turbine

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Unsupervised Damage Detection for Offshore Jacket Wind Turbine Foundations Based on an Autoencoder Neural Network

Sensors ◽

10.3390/s21103333 ◽

2021 ◽

Vol 21 (10) ◽

pp. 3333

Author(s):

Maria del Cisne Feijóo ◽

Yovana Zambrano ◽

Yolanda Vidal ◽

Christian Tutivén

Keyword(s):

Neural Network ◽

Wind Turbine ◽

Environmental Conditions ◽

Wind Farms ◽

Offshore Wind ◽

Offshore Wind Turbine ◽

Small Subset ◽

Scaled Model ◽

Vibration Data ◽

Large Water

Structural health monitoring for offshore wind turbine foundations is paramount to the further development of offshore fixed wind farms. At present time there are a limited number of foundation designs, the jacket type being the preferred one in large water depths. In this work, a jacket-type foundation damage diagnosis strategy is stated. Normally, most or all the available data are of regular operation, thus methods that focus on the data leading to failures end up using only a small subset of the available data. Furthermore, when there is no historical precedent of a type of fault, those methods cannot be used. In addition, offshore wind turbines work under a wide variety of environmental conditions and regions of operation involving unknown input excitation given by the wind and waves. Taking into account the aforementioned difficulties, the stated strategy in this work is based on an autoencoder neural network model and its contribution is two-fold: (i) the proposed strategy is based only on healthy data, and (ii) it works under different operating and environmental conditions based only on the output vibration data gathered by accelerometer sensors. The proposed strategy has been tested through experimental laboratory tests on a scaled model.

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Effects of Dynamic Motion and Structural Response of a Semi-submersible Floating Offshore Wind Turbine Structure Under Waves Generated in a Hurricane Environment

International Journal of Precision Engineering and Manufacturing-Green Technology ◽

10.1007/s40684-021-00331-w ◽

2021 ◽

Author(s):

Tae-won Kang ◽

Eung-soo Kim ◽

Hyun-ik Yang

Keyword(s):

Wind Turbine ◽

Structural Response ◽

Offshore Wind ◽

Offshore Wind Turbine ◽

Floating Offshore Wind Turbine ◽

Dynamic Motion

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Improving the Strategy of Maintaining Offshore Wind Turbines through Petri Net Modelling

Applied Sciences ◽

10.3390/app11020574 ◽

2021 ◽

Vol 11 (2) ◽

pp. 574

Author(s):

Rundong Yan ◽

Sarah Dunnett

Keyword(s):

Wind Turbine ◽

Wind Turbines ◽

Petri Net ◽

Offshore Wind ◽

Offshore Wind Turbine ◽

Maintenance Costs ◽

Offshore Wind Turbines ◽

Major Repair ◽

Wind Turbine System ◽

Periodic Maintenance

In order to improve the operation and maintenance (O&M) of offshore wind turbines, a new Petri net (PN)-based offshore wind turbine maintenance model is developed in this paper to simulate the O&M activities in an offshore wind farm. With the aid of the PN model developed, three new potential wind turbine maintenance strategies are studied. They are (1) carrying out periodic maintenance of the wind turbine components at different frequencies according to their specific reliability features; (2) conducting a full inspection of the entire wind turbine system following a major repair; and (3) equipping the wind turbine with a condition monitoring system (CMS) that has powerful fault detection capability. From the research results, it is found that periodic maintenance is essential, but in order to ensure that the turbine is operated economically, this maintenance needs to be carried out at an optimal frequency. Conducting a full inspection of the entire wind turbine system following a major repair enables efficient utilisation of the maintenance resources. If periodic maintenance is performed infrequently, this measure leads to less unexpected shutdowns, lower downtime, and lower maintenance costs. It has been shown that to install the wind turbine with a CMS is helpful to relieve the burden of periodic maintenance. Moreover, the higher the quality of the CMS, the more the downtime and maintenance costs can be reduced. However, the cost of the CMS needs to be considered, as a high cost may make the operation of the offshore wind turbine uneconomical.

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