This paper describes the analysis of near-surface wind speeds in Western Oklahoma. The goals of this research are to characterise the nocturnal low-level jet (LLJ) in the region, and to assess the impact wind variability, vertical shear and the LLJ on wind energy calculations. Results show the...

This paper analyses the effect wind turbulence on the output of large-sized wind turbines. A brief account of atmospheric stability and vertical temperature gradient is explained. The principal objective of this paper is to give an account of underlying principles and concepts without going into...

Wind Turbines (WT) are one of the fastest growing sources of power production in the world today and there is a constant need to reduce the costs of operating and maintaining them. Condition monitoring (CM) is a tool commonly employed for the early detection of faults/failures so as to minimise...

A genetic algorithm approach is employed to obtain optimal placement of wind turbines for maximum production capacity while limiting the number of turbines installed and the acreage of land occupied by each wind farm. Specifically, three cases are considered—(a) unidirectional uniform wind,...

This paper presents some technical details, operational experiences, and lessons learnt by the Colombian public utility – Empresas Públicas de Medellín – with a recently installed 19.5MW wind park in the northern region of Colombia – province of La Guajira. This is the first ever wind...

The wind speed and direction as well as the availability, the duration and the diurnal variation of two offshore sites, Zakinthos and Pylos (BZK and BPY) in the Ionian Sea were assessed. For an analysis period of two years, the mean wind speed at 10m was determined as 5.7±0.1ms−1 and...

This contribution presents the application of a portfolio of forecasters to the problem of wind speed forecasting. This portfolio is created using a single time series and it is based on a number of time series characteristics, previously proposed, and a set of novel time series features. The...

The problem of designing a nonlinear feedback control scheme for variable speed wind turbines, without wind speed measurements, in below rated wind conditions was addressed. The objective is to operate the wind turbines in order to have maximum wind power extraction while also the mechanical...

Wind turbines (WT) are socially controversial because of their visual and acoustic impacts. Today, visual impact is studied through photomontages and virtual environments while acoustic impact is rather evaluated through technical studies. This paper aims to study the landscape of WT in situ...

A substantial number of wind energy projects have been stalled or abandoned in the United States of America (US) due to concerns over the effects of wind turbines on radar installations. Between 2008 and 2010, military, airspace, or meteorological radar concerns in the US contributed to the...