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

Aditya Choukulkar, Yelena Pichugina, Christopher T M Clack, Ronald Calhoun, Robert Banta, Alan Brewer, Michael Hardesty

Research output: Contribution to journalArticlepeer-review

49 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)1439-1452
Number of pages14
JournalWind Energy
Issue number8
StatePublished - Aug 1 2016


  • Doppler lidar
  • equivalent wind speed
  • wind energy
  • wind power calculation
  • wind power forecasting
  • wind resource assessment

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment


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