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Energies 2018, 11(12), 3346; https://doi.org/10.3390/en11123346

Fast Control-Oriented Dynamic Linear Model of Wind Farm Flow and Operation

Wind Energy, Technical University of Denmark, 4000 Roskilde, Denmark
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Received: 13 September 2018 / Revised: 13 October 2018 / Accepted: 26 November 2018 / Published: 30 November 2018
(This article belongs to the Section Sustainable Energy)
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Abstract

The aerodynamic interaction between wind turbines grouped in wind farms results in wake-induced power loss and fatigue loads of wind turbines. To mitigate these, wind farm control should be able to account for those interactions, typically using model-based approaches. Such model-based control approaches benefit from computationally fast, linear models and therefore, in this work, we introduce the Dynamic Flow Predictor. It is a fast, control-oriented, dynamic, linear model of wind farm flow and operation that provides predictions of wind speed and turbine power. The model estimates wind turbine aerodynamic interaction using a linearized engineering wake model in combination with a delay process. The Dynamic Flow Predictor was tested on a two-turbine array to illustrate its main characteristics and on a large-scale wind farm, comparable to modern offshore wind farms, to illustrate its scalability and accuracy in a more realistic scale. The simulations were performed in SimWindFarm with wind turbines represented using the NREL 5 MW model. The results showed the suitability, accuracy, and computational speed of the modeling approach. In the study on the large-scale wind farm, rotor effective wind speed was estimated with a root-mean-square error ranging between 0.8% and 4.1%. In the same study, the computation time per iteration of the model was, on average, 2.1 × 10 5 s. It is therefore concluded that the presented modeling approach is well suited for use in wind farm control. View Full-Text
Keywords: wind farm; dynamic flow model; control; linear; prediction; Kalman filter wind farm; dynamic flow model; control; linear; prediction; Kalman filter
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Kazda, J.; Cutululis, N.A. Fast Control-Oriented Dynamic Linear Model of Wind Farm Flow and Operation. Energies 2018, 11, 3346.

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