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Doekemeijer, B.M. (author), van Wingerden, J.W. (author)Wind farm control (WFC) algorithms rely on an estimate of the ambient wind speed, wind direction, and turbulence intensity in the determination of the optimal control setpoints. However, the measurements available in a commercial wind farm do not always carry sufficient information to estimate these atmospheric quantities. In this paper, a...journal article 2020
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Mulders, S.P. (author), Hovgaard, Tobias Gybel (author), Grunnet, Jacob Deleuran (author), van Wingerden, J.W. (author)With the ever increasing power rates of wind turbines, more advanced control techniques are needed to facilitate tall towers that are low in weight and cost-effective but in effect more flexible. Such soft-soft tower configurations generally have their fundamental side-side frequency in the below-rated operational domain. Because the turbine...journal article 2020
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Frederik, J.A. (author), Weber, Robin (author), Cacciola, Stefano (author), Campagnolo, Filippo (author), Croce, Alessandro (author), Bottasso, Carlo (author), van Wingerden, J.W. (author)As wind turbines in a wind farm interact with each other, a control problem arises that has been extensively studied in the literature: how can we optimize the power production of a wind farm as a whole? A traditional approach to this problem is called induction control, in which the power capture of an upstream turbine is lowered for the...journal article 2020
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Cassamo, Nassir (author), van Wingerden, J.W. (author)The high dimensions and governing non-linear dynamics in wind farm systems make the design of numerical optimal controllers computationally expensive. A possible pathway to circumvent this challenge lies in finding reduced order models which can accurately embed the existing non-linearities. The work presented here applies the ideas motivated...journal article 2020
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Doekemeijer, B.M. (author), van der Hoek, D.C. (author), van Wingerden, J.W. (author)Wind farm (WF) controllers adjust the control settings of individual turbines to enhance the total performance of a wind farm. Most WF controllers proposed in the literature assume a time-invariant inflow, whereas important quantities such as the wind direction and speed continuously change over time in reality. Furthermore, properties of the...journal article 2020
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Liu, Y. (author), Frederik, J.A. (author), Fontanella, A. (author), Ferrari, Riccardo M.G. (author), van Wingerden, J.W. (author)Individual Pitch Control (IPC) is a well-known and, in normal operating conditions, effective approach to alleviate blade loads in wind turbines. However, in the case of a Pitch Actuator Stuck (PAS) type of fault, conventional IPC is not beneficial since its action is disturbed by the failed pitch actuator. In this paper, a Subspace...conference paper 2020
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Fontanella, A. (author), Al, M. (author), van der Hoek, D.C. (author), Liu, Y. (author), van Wingerden, J.W. (author), Belloli, M. (author)The design of control strategies for floating offshore wind turbines (FOWTs) is even more difficult than for onshore and bottom-fixed offshore ones and a recognized control strategy for FOWTs is currently lacking. In order to design effective control strategies, the additional dynamics of these systems should be taken into account in the...journal article 2020
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Mulders, S.P. (author), Pamososuryo, A.K. (author), van Wingerden, J.W. (author)With the trend of increasing wind turbine rotor diameters, the mitigation of blade fatigue loadings is of special interest to extend the turbine lifetime. Fatigue load reductions can be partly accomplished using individual pitch control (IPC), and is commonly facilitated by the so-called multiblade coordinate (MBC) transformation. This...journal article 2020
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van den Broek, M.J. (author), van Wingerden, J.W. (author)We aim to improve wind farm control for power output by building on the results from WFSim for the development of a dynamic wind farm model. This model will be part of a closed-loop, economic model-predictive control approach for wind farms. It is constructed from first principles using open-source tools to be suitable for adjoint-based...journal article 2020
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van der Hoek, D.C. (author), Doekemeijer, B.M. (author), Andersson, Leif Erik (author), van Wingerden, J.W. (author)In recent years, wake steering has been established as a promising method to increase the energy yield of a wind farm. Current practice in estimating the benefit of wake steering on the annual energy production (AEP) consists of evaluating the wind farm with simplified surrogate models, casting a large uncertainty on the estimated benefit....journal article 2020
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Göcmen, Tuhfe (author), Kölle, Konstanze (author), Andersen, Soren Juhl (author), Eguinoa, Irene (author), Duc, Thomas (author), Campagnolo, Filippo (author), Iribas-Latour, Mikel (author), Astrain, David (author), Bottasso, Carlo (author), Meyers, Johan (author), van Wingerden, J.W. (author), Giebel, Gregor (author)Careful validation of the modelling and control actions is of vital importance to build confidence in the value of coordinated wind farm control (WFC). The efficiency of flow models applied to WFC should be evaluated to provide reliable assessment of the performance of WFC. In order to achieve that, FarmConners launches a common benchmark for...journal article 2020
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van Wingerden, J.W. (author), Fleming, P. A. (author), Göcmen, T. (author), Eguinoa, I. (author), Doekemeijer, B.M. (author), Dykes, K. (author), Lawson, M. (author), Simley, E. (author), King, J. (author)Wind farm control is an active and growing field of research in which the control actions of individual turbines in a farm are coordinated, accounting for inter-turbine aerodynamic interaction, to improve the overall performance of the wind farm and to reduce costs. The primary objectives of wind farm control include increasing power...journal article 2020
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Pires, O. (author), Azcona, J. (author), Vittori, F. (author), Bayati, I. (author), Gueydon, S. (author), Fontanella, A. (author), Liu, Y. (author), De Ridder, E. J. (author), Belloli, M. (author), van Wingerden, J.W. (author)The hybrid testing method developed by CENER for floating wind turbine scaled tests combining wind and waves (SIL) has been upgraded in order to introduce not only the wind turbine rotor thrust, but also the out-of-plane rotor moments (aerodynamic and gyroscopic). The former ducted-fan has been substituted by a multi-propellers actuator...journal article 2020
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Fontanella, A. (author), Liu, Y. (author), Azcona, J. (author), Pires, O. (author), Bayati, I. (author), Gueydon, S. (author), De Ridder, E. J. (author), van Wingerden, J.W. (author), Belloli, M. (author)This paper presents a new hardware-in-the-loop methodology for wave-basin scale-model experiments about floating offshore wind turbines and its application as a tool for the validation of control strategies. In the hardware-in-the-loop experiments, the physical Froude-scaled wind turbine model used in conventional scale-model tests is...journal article 2020
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Gutierrez Santiago, U. (author), van Wingerden, J.W. (author), Polinder, H. (author), Sisón, A. Fernández (author)The gearbox is a critical component of modern MW wind turbines. An accurate model of the gearbox dynamics is needed to improve gearbox design, develop advanced control algorithms, and more effective fault diagnosis tools which could lead to lower the cost of energy from wind. The objective of this paper is to investigate how torque...journal article 2020
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Al, M. (author), Fontanella, A. (author), van der Hoek, D.C. (author), Liu, Y. (author), Belloli, M. (author), van Wingerden, J.W. (author)Floating offshore wind turbines allow wind energy to be harvested in deep waters. However, additional dynamics and structural loads may result when the floating platform is being excited by wind and waves. In this work, the conventional wind turbine controller is complemented with a novel linear feedforward controller based on wave...journal article 2020
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Frederik, J.A. (author), Doekemeijer, B.M. (author), Mulders, S.P. (author), van Wingerden, J.W. (author)Dynamic wind farm control is a new strategy that aims to apply time-varying, often periodic, control signals on upstream wind turbines to increase the wake mixing behind the turbine. As a result, wake recovery is accelerated, leading to a higher power production of downstream turbines. As the amount of interest in dynamic control strategies...journal article 2020
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Liu, Y. (author), Fontanella, A. (author), Wu, P. (author), Ferrari, Riccardo M.G. (author), van Wingerden, J.W. (author)Floating Offshore Wind Turbines (FOWTs) are more prone to suffer from faults and failures than bottom-fixed counterparts due to the severe wind and wave loads typical of deep water sites. In particular, mooring line faults may lead to unacceptably high operation and maintenance costs due to the limited accessibility of FOWTs. Detecting the...journal article 2020
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Andersson, Leif Erik (author), Doekemeijer, B.M. (author), van der Hoek, D.C. (author), van Wingerden, J.W. (author), Imsland, Lars (author)This article investigates the optimization of yaw control inputs of a nine-turbine wind farm. The wind farm is simulated using the high-fidelity simulator SOWFA. The optimization is performed with a modifier adaptation scheme based on Gaussian processes. Modifier adaptation corrects for the mismatch between plant and model and helps to...journal article 2020
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Frederik, J.A. (author), Doekemeijer, B.M. (author), Mulders, S.P. (author), van Wingerden, J.W. (author)Wind farm control using dynamic concepts is a research topic that is receiving an increasing amount of interest. The main concept of this approach is that dynamic variations of the wind turbine control settings lead to higher wake turbulence, and subsequently faster wake recovery due to increased mixing. As a result, downstream turbines...journal article 2020