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Kumar, V. (author), Savenije, F.J. (author), van Wingerden, J.W. (author)
Increasing demands in decentralized power plants have focused attention on Vertical Axis Wind Turbines (VAWTs). However, accessing high range of power from VAWTs is an impediment due to increased loads on the turbine blades. Here, we derive an optimal pitching action that reduces the periodic disturbance on turbine blades of VAWTs without...
conference paper 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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Marrero, Madelyn (author), Martin, C.L. (author), Muntean, Radu (author), González-Vallejo, Patricia (author), Rodríguez-Alba, MD (author)
Several strategies are presented to teach university students and professionals in the sector how to reduce the environmental impact of our cities. First, the European City-zen project is summarized and its application to the city of Seville, more specifically to Tiro de Linea, a working class neighborhood, is described; the viability and...
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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Doekemeijer, B.M. (author), Boersma, S. (author), Pao, L. Y. (author), van Wingerden, J.W. (author)
Wind farm control research typically relies on computationally inexpensive, surrogate models for real-time optimization. However, due to the large time delays involved, changing atmospheric conditions and tough-to-model flow and turbine dynamics, these surrogate models need constant calibration. In this paper, a novel real-time (joint state...
conference paper 2018
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Mulders, S.P. (author), van Wingerden, J.W. (author)
Wind energy research groups from various disciplines generally use self-developed baseline wind turbine control implementations and tunings, which complicates the evaluation and comparison of new control algorithms. To solve this problem, the Delft Research Controller (DRC) provides an open, modular and fully adaptable baseline wind turbine...
conference paper 2018
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Kröger, Lars (author), Frederik, J.A. (author), van Wingerden, J.W. (author), Peinke, Joachim (author), Hölling, Michael (author)
A wind tunnel experiment is presented which combines the use of controlled turbulent inflow conditions and a two-bladed model wind turbine utilizing a new control strategy called subspace predictive repetitive control (SPRC). The validation of the performance of SPRC was made under turbulent inflow conditions generated by an active grid. The...
conference paper 2018
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Frederik, J.A. (author), Kröger, Lars (author), Peinke, Joachim (author), Hölling, Michael (author), van Wingerden, J.W. (author)
To reduce the cost of wind energy, it is essential to reduce loads on turbine blades to increase lifetime and decrease maintenance cost. To achieve this, Individual Pitch Control (IPC) received an increasing amount of attention in recent years. In this paper, a data-driven IPC algorithm called Subspace Predictive Repetitive Control (SPRC) is...
conference paper 2018
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Siniscalchi-Minna, S. (author), De-Prada-Gil, M. (author), Bianchi, F. D. (author), Ocampo-Martinez, C. (author), De Schutter, B.H.K. (author)
Nowadays, wind power plants (WPPs) should be able to dynamically change their power output to meet the power demanded by the transmission system operators. When the wind power generation exceeds the power demand, the WPP works in de-loading operation keeping some power reserve to be delivered into the grid to balance the frequency drop. This...
conference paper 2018
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van Well, A.A. (author), Rekveldt, M.T. (author)
A review is given of double and single arm Larmor diffraction. With the former a lattice-spacing resolution down to 10-6 can be obtained. The latter is a good high-resolution alternative if the sample or sample environment disturbs the magnetic field, e.g. ferromagnetic samples or applied magnetic fields. By choosing the tilt angle of the...
conference paper 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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Vuik, A. (author), Eeltink, D. (author), Akhmerov, A.R. (author), Wimmer, M.T. (author)
One of the promising platforms for creating Majorana bound states is a hybrid nanostructure consisting of a semiconducting nanowire covered by a superconductor.Weanalyze the previously disregarded role of electrostatic interaction in these devices. Our main result is that Coulomb interaction causes the chemical potential to respond to an applied...
journal article 2016
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Esin, I. (author), Romito, A. (author), Blanter, I.M. (author), Gefen, Y. (author)
Measurements with variable system–detector interaction strength, ranging from weak to strong, have been recently reported in a number of electronic nanosystems. In several such instances many-body effects play a significant role. Here we consider the weak-to-strong crossover for a setup consisting of an electronic Mach–Zehnder interferometer,...
journal article 2016
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Boersma, S. (author), Gebraad, P.M.O. (author), Vali, M. (author), Doekemeijer, B.M. (author), van Wingerden, J.W. (author)
In this paper, we present and extend the dynamic medium fidelity control-oriented Wind Farm Simulator (WFSim) model. WFSim resolves flow fields in wind farms in a horizontal, two dimensional plane. It is based on the spatially and temporally discretised two dimensional Navier-Stokes equations and the continuity equation and solves for a...
conference paper 2016
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Doekemeijer, B.M. (author), van Wingerden, J.W. (author), Boersma, S. (author), Pao, L. Y. (author)
Wind turbines are often grouped together for financial reasons, but due to wake development this usually results in decreased turbine lifetimes and power capture, and thereby an increased levelized cost of energy (LCOE). Wind farm control aims to minimize this cost by operating turbines at their optimal control settings. Most state-of-the-art...
conference paper 2016
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Vali, M. (author), van Wingerden, J.W. (author), Boersma, S. (author), Petrović, V. (author), Kühn, M. (author)
This paper proposes an adjoint-based model predictive control for optimal energy extraction of wind farms. It employs the axial induction factor of wind turbines to influence their aerodynamic interactions through the wake. The performance index is defined here as the total power production of the wind farm over a finite prediction horizon. A...
conference paper 2016
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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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Mulders, S.P. (author), van Solingen, E. (author), van Wingerden, J.W. (author), Beerens, J (author)
At present, the cost of offshore wind energy does not meet the level of onshore wind and fossil-based energy sources. One way to extend the turbine lifetime, and thus reduce cost, is by reduction of the fatigue loads of blades and other turbine parts using Individual Pitch Control (IPC). This type of control, which is generally implemented by...
conference paper 2016
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Rocha, I.B.C.M. (author), Raijmaekers, S (author), Nijssen, RPL (author), van der Meer, F.P. (author), Sluys, Lambertus J. (author)
In this work a glass/epoxy composite commonly used in wind turbine blades is exposed to a humid environment at an elevated temperature. To research the anisotropic di_usion behaviour observed in unidirectional composite specimens, experimental results of slices cut along the three directional planes of the laminate immersed in demineralised...
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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