Re-assessment of wake losses

 

Re-assessment of wake losses

Site: small wind farm in Germany; the client assumes distinctly higher wake losses than calculated in the original assessment report

Procedure: profound analysis of SCADA data, adapted model calculations

Results:

  • The wind rose of the met station data used in the wind assessment report turned out to be little appropriate for the site, which is influenced by local effects.
  • The frequency distribution of the wind speed of the met station data is also not representative of the site.
  • The thrust coefficients provided by the turbine manufacturer are too low which has often been observed by aj for this manufacturer.
  • The turbulence at the site is low, therefore the wake losses were predicted too low.

Final result: wake losses more than doubled compared to the original calculations

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