A new formulation for rotor equivalent wind speed for wind resource assessment and wind power forecasting

• Published in: Wind energy (Chichester, England) Vol. 19; no. 8; pp. 1439 - 1452
• Main Authors: Choukulkar, Aditya, Pichugina, Yelena, Clack, Christopher T. M., Calhoun, Ronald, Banta, Robert, Brewer, Alan, Hardesty, Michael
• Format: Journal Article
• Language: English
• Published: Bognor Regis Blackwell Publishing Ltd 01.08.2016; John Wiley & Sons, Inc
• Subjects: Doppler lidar; Energy efficiency; Energy industry; Energy sources; equivalent wind speed; Field tests; Fluctuations; Forecasting; Mathematical analysis; New technology; Renewable resources; Turbines; Turbulence; Variation; wind energy; Wind farms; Wind power; wind power calculation; wind power forecasting; Wind power generation; wind resource assessment; Wind shear; Wind speed; Wind turbines
• ISSN: 1095-4244; 1099-1824
• DOI: 10.1002/we.1929

The spurt of growth in the wind energy industry has led to the development of many new technologies to study this energy resource and improve the efficiency of wind turbines. One of the key factors in wind farm characterization is the prediction of power output of the wind farm that is a strong function of the turbulence in the wind speed and direction. A new formulation for calculating the expected power from a wind turbine in the presence of wind shear, turbulence, directional shear and direction fluctuations is presented. It is observed that wind shear, directional shear and direction fluctuations reduce the power producing capability, while turbulent intensity increases it. However, there is a complicated superposition of these effects that alters the characteristics of the power estimate that indicates the need for the new formulation. Data from two field experiments is used to estimate the wind power using the new formulation, and results are compared to previous formulations. Comparison of the estimates of available power from the new formulation is not compared to actual power outputs and will be a subject of future work. © 2015 The Authors. Wind Energy published by John Wiley & Sons, Ltd.