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Gunes, Bilal (author), van Wingerden, J.W. (author), Verhaegen, M.H.G. (author)In this paper, we present a novel multiple input multiple output (MIMO) linear parameter varying (LPV) state-space refinement system identification algorithm that uses tensor networks. Its novelty mainly lies in representing the LPV sub-Markov parameters, data and state-revealing matrix condensely and in exact manner using specific tensor...journal article 2018
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Boersma, S. (author), Rostampour, Vahab (author), Doekemeijer, B.M. (author), van Geest, W.J.M. (author), van Wingerden, J.W. (author)The objective of active power control in wind farms is to provide ancillary grid services. Improving this is vital for a smooth wind energy penetration in the energy market. One of these services is to track a power reference signal with a wind farm by dynamically de- and uprating the turbines. In this paper we present a computationally...conference paper 2018
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Raach, Steffen (author), Boersma, S. (author), Doekemeijer, B.M. (author), van Wingerden, J.W. (author), Cheng, Po Wen (author)This work presents the next step in realizing lidar-based closed-loop wake redirection control. Lidar-based closed-loop wake redirection aims at repositioning the wake at a desired position by yawing the wind turbine. The actual wake deflection is derived from lidar measurements and used in a closed-loop control scheme. Compared to an open...conference paper 2018
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Cavallo, G. (author), van de Ruit, M.L. (author), Schouten, A.C. (author), van Wingerden, J.W. (author), Lataire, J. (author)In this study, a nonparametric method, developed in Lataire et al. (2012), is applied to the identification of linear time-varying human joint admittance. The aim of the method, denoted Skirt Decomposition method, is to reconstruct the time-varying system function. The main contribution of the paper is to evaluate the possibilities and...journal article 2018
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Mulders, S.P. (author), Diepeveen, N.F.B. (author), van Wingerden, J.W. (author)The business case for compact hydraulic wind turbine drivetrains is becoming ever stronger, as offshore wind turbines are getting larger in terms of size and power output. Hydraulic transmissions are generally employed in high-load systems and form an opportunity for application in multi-megawatt turbines. The Delft Offshore Turbine (DOT) is a...journal article 2018
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Doekemeijer, B.M. (author), Boersma, S. (author), Pao, Lucy Y. (author), Knudsen, Torben (author), van Wingerden, J.W. (author)Wind farm control often relies on computationally inexpensive surrogate models to predict the dynamics inside a farm. However, the reliability of these models over the spectrum of wind farm operation remains questionable due to the many uncertainties in the atmospheric conditions and tough-to-model dynamics at a range of spatial and temporal...journal article 2018
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Rott, Andreas (author), Doekemeijer, B.M. (author), Seifert, Janna Kristina (author), van Wingerden, J.W. (author), Kuhn, Martin (author)The prospects of active wake deflection control to mitigate wake-induced power losses in wind farms have been demonstrated by large eddy simulations, wind tunnel experiments, and recent field tests. However, it has not yet been fully understood how the yaw control of wind farms should take into account the variability in current environmental...journal article 2018
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van Wingerden, J.W. (author), Pao, Lucy (author), Fleming, Paul (author)For wind farm control, the current practice in industry is that every turbine has its own wind turbine controller that will optimize its own performance in terms of power output, load mitigation, and/or reference tracking. However, in several national American and European1 research projects, researchers from industry and academia have shown...abstract 2017
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Mulders, S.P. (author), Jager, Stéphane (author), Diepeveen, N.F.B. (author), van Wingerden, J.W. (author)The drivetrain of most wind turbines currently being deployed commercially consists of a rotor-gearboxgenerator configuration in the nacelle. This abstract introduces the control system design and optimization for a wind turbine with a hydraulic drivetrain, based on the Delft Offshore Turbine (DOT) concept1 . This concept enables the connection...abstract 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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Gunes, Bilal (author), van Wingerden, J.W. (author), Verhaegen, M.H.G. (author)The major bottleneck in state-of-the-art Linear Parameter Varying (LPV) subspace methods is the curse-of-dimensionality during the first regression step. In this paper, the origin of the curse-of-dimensionality is pinpointed and subsequently a novel method is proposed which does not suffer from this bottleneck. The problem is related to the...journal article 2017
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Rott, A. (author), Boersma, S. (author), van Wingerden, J.W. (author), Kühn, Martin (author)For short-term power predictions and estimations of the available power during curtailment of a wind farm, it is necessary to consider the flow dynamics and aerodynamic interactions of the turbines. In this paper, a control-oriented dynamic two-dimensional wind farm model is introduced that aims to incorporate real-time measurements such as...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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van Solingen, E. (author), Mulders, S.P. (author), van Wingerden, J.W. (author)Traditionally, wind turbine controllers are designed using first principles or linearized or identified models. The aim of this paper is to show that with an automated, online, and model-free tuning strategy, wind turbine control performance can be significantly increased. For this purpose, iterative feedback tuning (IFT) is applied to two...journal article 2017
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Navalkar, S.T. (author), van Wingerden, J.W. (author)Commercial wind turbine blades are progressively becoming longer and more flexible; in order to achieve load reduction, the use of shape modifying devices is currently under research. While such modifications facilitate cost reduction, they also render the blade susceptible to the unstable aeroelastic phenomenon of flutter. To be able to detect...journal article 2017
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Telsang, B. (author), Navalkar, S.T. (author), van Wingerden, J.W. (author)Nuclear norm based subspace identification methods have recently gained importance due to their ability to find low rank solutions while maintaining accuracy through convex optimization. However, their heavy computational burden typically precludes the use in an online, recursive manner, such as may be required for adaptive control. This...conference paper 2017
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Vali, M. (author), Petrović, Vlaho (author), Boersma, S. (author), van Wingerden, J.W. (author), Kühn, Martin (author)In this paper, we extend our closed-loop optimal control framework for wind farms to minimize wake-induced power losses. We develop an adjoint-based model predictive controller which employs a medium-fidelity 2D dynamic wind farm model. The wind turbine axial induction factors are considered here as the control inputs to influence the overall...conference paper 2017
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Navalkar, S.T. (author), Bernhammer, L.O. (author), Sodja, J. (author), Slinkman, C.J. (author), van Wingerden, J.W. (author), van Kuik, G.A.M. (author)Trailing edge aps located outboard on wind turbine blades have recently shown considerable potential in the alleviation of turbine lifetime dynamic loads. The concept of the free-oating ap is speci_cally interesting for wind turbines, on account of its modularity and enhanced control authority. Such a ap is free to rotate about its axis;...conference paper 2016
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Verelst, DRS (author), Larsen, TJ (author), van Wingerden, J.W. (author)A series of free yawing wind tunnel experiments was held in the Open Jet Facility<br/>(OJF) of the TU Delft. The ≈ 300 W turbine has three blades in a downwind configuration and is optionally free to yaw. Different 1.6m diameter rotor configurations are tested such as blade flexibility and sweep. This paper gives a brief overview of the...conference paper 2016
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van Kuik, G.A.M. (author), Peinke, Joachim (author), Nijssen, Rogier (author), Lekou, Denja (author), Mann, Jakob (author), Sørensen, Jens Nørkær (author), Ferreira, Carlos (author), van Wingerden, J.W. (author), Schlipf, David (author), Gebraad, P.M.O. (author), Polinder, H. (author), Abrahamsen, Asger Bech (author), van Bussel, G.J.W. (author), Sørensen, John Dalsgaard (author), Tavner, Peter (author), Botasso, Carlo (author), Muskulus, Michael (author), Matha, Denis (author), Lindeboom, Han (author), Degraer, Steven (author), Kramer, Oliver (author), Lehnhoff, Sebastian (author), Sonnenschein, Michael (author), Sørensen, Poul Ejnar (author), Kunneke, R.W. (author), Morthorst, Poul Erik (author), Skytte, Klaus (author)The European Academy of Wind Energy (eawe), representing universities and institutes with a significant wind energy programme in 14 countries, has discussed the long-term research challenges in wind energy. In contrast to research agendas addressing short- to medium-term research activities, this eawe document takes a longer-term perspective,...review 2016