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Nonlinear Control of Variable Speed Wind Turbines without wind speed measurement
Proceedings of the 44th IEEE Conference on Decision and Control, 2006A nonlinear approach, for variable speed wind turbines control, is presented by considering that there is no wind speed measurement. The control objective below rated wind speed is to maximize the extracted energy from the wind while reducing mechanical loads. The existing control techniques do not take into account the dynamical aspect of the wind and
Boukhezzar, B., Siguerdidjane, Houria
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The Journal of the Acoustical Society of America, 1987
Wind is the large-scale movement of air from one place to another. It is usual for the air to become horizontally stratified, the layers nearer the ground moving more slowly than or in a different direction to those higher up. This change of wind speed with height is known as wind gradient (or wind shear), and it may cause serious problems for aircraft
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Wind is the large-scale movement of air from one place to another. It is usual for the air to become horizontally stratified, the layers nearer the ground moving more slowly than or in a different direction to those higher up. This change of wind speed with height is known as wind gradient (or wind shear), and it may cause serious problems for aircraft
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Wind speed extreme quantiles estimation
2013 International Conference on Clean Electrical Power (ICCEP), 2013Wind speed (WS) probability distribution identification and estimation are the object of an increasing number of studies, especially related to the need of wind energy production evaluation. In this framework, the paper highlights the characterization of extreme WS quantiles, whose values and estimates are very sensitive to the assumed distributional ...
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Journal of Structural Engineering, 2003
Structures are designed with the intention of safely withstanding ordinary and extreme loads over the entire intended economic lifetime. Designation of appropriate design levels is especially difficult for natural processes, for which many decades of reliable data are desirable, but is often basically unattainable.
Anne M. Dougherty +2 more
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Structures are designed with the intention of safely withstanding ordinary and extreme loads over the entire intended economic lifetime. Designation of appropriate design levels is especially difficult for natural processes, for which many decades of reliable data are desirable, but is often basically unattainable.
Anne M. Dougherty +2 more
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Extreme wind speeds in mixed wind climates
Journal of Wind Engineering and Industrial Aerodynamics, 1978Abstract In this paper, a technique is discussed which enables extreme wind speed probabilities in mixed wind climates to be determined. It is shown that in such wind climates the method is likely to yield more accurate probability estimates than the traditional Gumbel analysis of annual wind speed maxima, particularly for annual probabilities of ...
L. Gomes, B.J. Vickery
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Design Wind Speed Characteristics
Structures Congress 2009, 2009Wind load provisions differ worldwide, each using varying averaging schemes for wind, recurrence intervals, load coefficients and multipliers, safety factors, and so on. These differences make it difficult to make direct comparisons between codes for a particular structure.
Jon A. Peterka, Kirsten D. Orwig
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Applied and Computational Engineering
With the help of wind farms, wind energy is a vital renewable energy source that contributes significantly to the worlds energy balance. The lifespan and maintenance costs of wind turbines will be reduced with an accurate wind speed prediction. On the other hand, wind speed is highly volatile and unpredictable. Thus, it is essential to do research into
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With the help of wind farms, wind energy is a vital renewable energy source that contributes significantly to the worlds energy balance. The lifespan and maintenance costs of wind turbines will be reduced with an accurate wind speed prediction. On the other hand, wind speed is highly volatile and unpredictable. Thus, it is essential to do research into
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2009
This paper aims at providing a general class of stochastic models for hourly average wind speed time series taking into account all the main features of wind speed data, namely autocorrelation, non-Gaussian distribution, seasonal and diurnal nonstationarity.
BONANNO, Giovanni +2 more
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This paper aims at providing a general class of stochastic models for hourly average wind speed time series taking into account all the main features of wind speed data, namely autocorrelation, non-Gaussian distribution, seasonal and diurnal nonstationarity.
BONANNO, Giovanni +2 more
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Virtual Wind Speed Sensor for Wind Turbines
Journal of Energy Engineering, 2011A data-driven approach for development of a virtual wind-speed sensor for wind turbines is presented. The virtual wind-speed sensor is built from historical wind-farm data by data-mining algorithms. Four different data-mining algorithms are used to develop models using wind-speed data collected by anemometers of various wind turbines on a wind farm ...
Andrew Kusiak +2 more
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Estimating wind speed distribution
Energy Conversion and Management, 2002The Weibull distribution is used to model wind speeds at four locations in Oman. The scale and shape parameters were estimated using three methods, the Chi-square method, method of moments and regression method. It was observed that the estimates using the Chi-squared method gave the best overall fit to the distribution of the wind data. Both the scale
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