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Doekemeijer, B.M. (author), van der Hoek, D.C. (author), van Wingerden, J.W. (author)Modern wind farm control (WFC) methods in the literature typically rely on a surrogate model of the farm dynamics that is computationally inexpensive to enable real-time computations. As it is very difficult to model all the relevant wind farm dynamics accurately, a closed-loop approach is a prerequisite for reliable WFC. As one of the few in...conference paper 2019
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Moustakis, N. (author), Mulders, S.P. (author), Kober, J. (author), van Wingerden, J.W. (author)Modern wind turbines require careful tuning of controller and estimator parameters. However, tuning requires expert control experience, and is therefore in practice often performed by a trial-and-error brute-force approach. The contribution of this work is twofold. Firstly, a framework for tuning the parameters for conventional control and...conference paper 2019
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Boersma, S. (author), Doekemeijer, B.M. (author), Siniscalchi-Minna, S. (author), van Wingerden, J.W. (author)Active power control for wind farms is needed to provide ancillary services. 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 closed-loop wind farm controller that evaluates 1) thrust coefficients on a seconds-scale that provide power tracking...journal article 2019
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Boersma, S. (author), Doekemeijer, B.M. (author), Keviczky, T. (author), van Wingerden, J.W. (author)Active power control for wind farms is needed to provide ancillary services. One of these services is to track a power reference signal with a wind farm by dynamically de- and uprating the turbines. Due to the stochastic nature of the wind, it is necessary to take this stochastic behavior into account when evaluating control signals. In this...conference paper 2019
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Doekemeijer, B.M. (author), Fleming, Paul A. (author), van Wingerden, J.W. (author)In wind farms, wake interaction leads to losses in power capture and accelerated structural degradation when compared to freestanding turbines. One method to reduce wake losses is by misaligning the rotor with the incoming flow using its yaw actuator, thereby laterally deflecting the wake away from downstream turbines. However, this demands...conference paper 2019
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Mendez Reyes, Hector (author), Kanev, Stoyan (author), Doekemeijer, B.M. (author), van Wingerden, J.W. (author)Wake redirection is an active wake control (AWC) concept that is known to have a high potential for increasing the overall power production of wind farms. Being based on operating the turbines with intentional yaw misalignment to steer wakes away from downstream turbines, this control strategy requires careful attention to the load...journal article 2019
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Mulders, S.P. (author), Diepeveen, N.F.B. (author), van Wingerden, J.W. (author)With the sustained drive towards higher power ratings for offshore wind turbines, the size of the turbine rotor and drivetrain components scale accordingly. Compact hydraulic transmissions are widely applied in high-load systems and form a business case for application in multi-megawatt offshore turbines. The Delft Offshore Turbine (DOT) is a...journal article 2019
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Keyvani Janbahan, A. (author), Tamer, M.S. (author), van Wingerden, J.W. (author), Goosen, J.F.L. (author), van Keulen, A. (author)Many investigations have focused on steady-state nonlinear dynamics of cantilevers in tapping mode atomic force microscopy (TM-AFM). However, a transient dynamic model—which is essential for a model-based control design—is still missing. In this paper, we derive a mathematical model which covers both the transient and steady-state behavior....journal article 2019
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Boersma, S. (author), Doekemeijer, B.M. (author), Vali, M. (author), Meyers, Johan (author), van Wingerden, J.W. (author)Wind turbines are often sited together in wind farms as it is economically advantageous. Controlling the flow within wind farms to reduce the fatigue loads, maximize energy production and provide ancillary services is a challenging control problem due to the underlying time-varying non-linear wake dynamics. In this paper, we present a control...journal article 2018
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Qiu, Y. (author), van Gijzen, M.B. (author), van Wingerden, J.W. (author), Verhaegen, M.H.G. (author), Vuik, Cornelis (author)This paper studies a new preconditioning technique for sparse systems arising from discretized partial differential equations in computational fluid dynamics problems. This preconditioning technique exploits the multilevel sequentially semiseparable (MSSS) structure of the system matrix. MSSS matrix computations give a data-sparse way to...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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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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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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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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Mulders, S.P. (author), Pamososuryo, Atindriyo Kusumo (author), Disario, Gianmarco Emilio (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) facilitated by the so-called multiblade coordinate (MBC) transformation. This operation transforms...journal article 2018
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van de Ruit, M.L. (author), Cavallo, Gaia (author), Lataire, John (author), van der Helm, F.C.T. (author), Mugge, W. (author), van Wingerden, J.W. (author), Schouten, A.C. (author)During movements, humans continuously regulate their joint impedance to minimize control effort and optimize performance. Joint impedance describes the relationship between a joint's position and torque acting around the joint. Joint impedance varies with joint angle and muscle activation and differs from trial-to-trial due to inherent...journal article 2018
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Boersma, S. (author), Rostampour, Vahab (author), Doekemeijer, B.M. (author), van Wingerden, J.W. (author), Keviczky, T. (author)In this paper, we present an implementation of a model predictive controller (MPC) for wind farm power tracking problem. The controller is evaluated in the high-fidelity PAral-lelized Large-eddy simulation Model (PALM). By taking measurements from PALM, we show that the closed-loop MPC can provide power reference tracking while reducing force...journal article 2018
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Torres, Patricio (author), van Wingerden, J.W. (author)In this paper, a new identification method for large 2D grids of interconnected systems is presented. The proposed algorithm minimizes the Output-Error of the lifted system by using a Steepest-Descent optimization method which exploit the Multilevel Sequentially-Semi Separable (MSSS) structure of the involved matrices. Furthermore, it is...journal article 2018