Searched for: subject:"Wind%5C+energy"
(1 - 20 of 64)

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van der Vlugt, R. (author), Bley, A.C. (author), Noom, Michael (author), Schmehl, R. (author)
The traction force of a kite can be used to drive a cyclic motion for extracting wind energy from the atmosphere. This paper presents a novel quasi-steady modelling framework for predicting the power generated over a full pumping cycle. The cycle is divided into traction, retraction and transition phases, each described by an individual set...
journal article 2019
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Hegberg, T. (author)
In this dissertation, structural wind turbine blade layouts are presented that are suitable for 10MW and 20MW wind turbine blades. This has been accomplished by using a medium fidelity static aeroelastic model embedded in an optimisation framework. The structural solutions are the result of a stiffness optimisation where the blade mass is...
doctoral thesis 2019
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Thedens, P. (author), De Oliveira Andrade, G.L. (author), Schmehl, R. (author)
We present a multidisciplinary design optimization method for the profile and structural reinforcement layout of a ram‐air kite rib. The aim is to minimize the structural elastic energy and to maximize the traction power of a ram‐air kite used for airborne wind energy generation. Because of the large deformations occurring during flight, a fluid...
journal article 2019
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Bijl, H.J. (author)
Wind turbines are growing bigger to becomemore cost-efficient. This does increase the severity of the vibrations that are present in the turbine blades, both due to predictable effects like wind shear and tower shadow, and due to less predictable effects like turbulence and flutter. If wind turbines are to become bigger and more cost-efficient,...
doctoral thesis 2018
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Lavidas, G. (author), Venugopal, Vengatesan (author)
At autonomous electricity grids Renewable Energy (RE) contributes significantly to energy production. Offshore resources benefit from higher energy density, smaller visual impacts, and higher availability levels. Offshore locations at the West of Crete obtain wind availability ≈80%, combining this with the installation potential for large scale...
journal article 2018
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Gunes, Bilal (author)
doctoral thesis 2018
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Micaleff, Daniel (author), van Bussel, G.J.W. (author)
Urban wind energy research is crucial for the success or failure of wind turbines installed in the built environment. Research in this field is fragmented into various research groups working on different topics in isolation with seemingly few efforts of integrating the various fields. This review aims at highlighting the synergies between the...
journal article 2018
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Frederik, J.A. (author), Kröger, Lars (author), Gülker, Gerd (author), van Wingerden, J.W. (author)
A commonly applied method to reduce the cost of wind energy, is alleviating the periodic loads on turbine blades using Individual Pitch Control (IPC). In this paper, a data-driven IPC methodology called Subspace Predictive Repetitive Control (SPRC) is employed. The effectiveness of SPRC will be demonstrated on a scaled 2-bladed wind turbine....
journal article 2018
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Bartolome Marques, L.A. (author), Teuwen, J.J.E. (author)
Developments in the wind industry reveal intricate engineering challenges, one of them being the erosion on the leading edge of the wind turbine blades. In this review work, the main issues for the wind industry in the experimentation with respect to erosion are examined. After a historical and general overview of erosion, this review focuses...
journal article 2018
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Desmond, Cian J. (author), Watson, S.J. (author), Montavon, Christiane (author), Murphy, Jimmy (author)
The flow over densely forested terrain under neutral and non-neutral conditions is considered using commercially available computational fluid dynamics (CFD) software. Results are validated against data from a site in Northeastern France. It is shown that the effects of both neutral and stable atmospheric stratifications can be modelled...
journal article 2018
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Bos, R. (author)
Wind turbines are the largest rotating machines on the planet, operating in some of the most remote and hostile areas. During a lifespan of several decades, they have to withstand storms, waves, and gusts (and preferably produce electricity in the process). Yet, designers cannot make them too strong. Every additional kilogram of mass has to be...
doctoral thesis 2017
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Jarquin Laguna, A. (author)
The work presented in this thesis explores a new way of generation, collection and transmission of wind energy inside a wind farm, in which the electrical conversion does not occur during any intermediate conversion step before the energy has reached the offshore central platform. A centralized approach for electricity generation is considered...
doctoral thesis 2017
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Meijers, P.C. (author), Tsouvalas, A. (author), Metrikine, A. (author)
Due to the increasing need for energy from renewable resources, a large number of offshore wind farms are planned to be constructed in the near future. Despite the plethora of available foundation concepts for offshore wind turbines, the monopile foundation is the most widely adopted concept in practice. To predict the installation process for a...
conference paper 2017
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van Wingerden, J.W. (author), Pao, Lucy (author), Aho, Jacob (author), Fleming, Paul (author)
Active power control can be used to balance the total power generated by wind farms with the power consumed on the electricity grid. With the increasing penetration levels of wind energy, there is an increasing need for this ancillary service. In this paper, we show that the tracking of a certain power reference signal provided by the...
conference paper 2017
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Raach, Steffen (author), Boersma, S. (author), van Wingerden, J.W. (author), Schlipf, David (author), Cheng, Po Wen (author)
Wind turbine wake redirection is a promising concept for wind farm control to increase the total power of a wind farm. Further, the concept aims to avoid partial wake overlap on a downwind wind turbine and hence aims to decrease structural loads. Controller for wake redirection need to account for model uncertainties due to the complexity of...
conference paper 2017
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Heistermann, Christine (author), Pavlovic, M. (author), Veljkovic, M. (author), Pak, Daniel (author), Feldmann, Markus (author), Rebelo, Carlos (author), da Silva, Luís Simões (author)
Friction connections with long open slotted holes have been proven to be a competitive alternative to the conventional flange connections in steel tubular towers for wind energy converters. As full-scale tests are not available, results of Finite Element Analysis (FEA) of the real-scale tower geometry are used in this paper to investigate the...
journal article 2017
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Fechner, U. (author)
doctoral thesis 2016
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Holtslag, M.C. (author)
Far offshore atmospheric conditions are favourable for wind energy purposes since mean wind speeds are relatively high (i.e., high power production) while turbulence levels are relatively low (i.e., less fatigue loads) compared to onshore conditions. Offshore wind energy, however, is still expensive compared to onshore wind energy. There is...
doctoral thesis 2016
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Gillebaart, T. (author)
One of the solutions to speed up the energy transition is the smart rotor concept: wind turbine blades with actively controlled Trailing Edge Flaps. In the past decade feasibility studies (both numerical and experimental) have been performed to assess the applicability of smart rotors in future design strategies and the next step is the...
doctoral thesis 2016
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Shariat Torbaghan, S. (author)
The new energy policy of the European Union (EU) with the core objectives of competitiveness, reliability and sustainability, has driven Europe into a transition towards a low carbon & sustainable electricity supply systems. Under the new policy, the European energy systems are pursing two major objectives. First is to shift the focus from...
doctoral thesis 2016
Searched for: subject:"Wind%5C+energy"
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