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RSS FeedsEnergies, Vol. 12, Pages 1486: Spatiotemporal Correlations in the Power Output of Wind Farms: On the Impact of Atmospheric Stability (Energies)

 
 

19 april 2019 11:04:25

 
Energies, Vol. 12, Pages 1486: Spatiotemporal Correlations in the Power Output of Wind Farms: On the Impact of Atmospheric Stability (Energies)
 




The dependence of temporal correlations in the power output of wind-turbine pairs on atmospheric stability is explored using theoretical arguments and wind-farm large-eddy simulations. For this purpose, a range of five distinct stability regimes, ranging from weakly stable to moderately convective, were investigated with the same aligned wind-farm layout used among simulations. The coherence spectrum between turbine pairs in each simulation was compared to theoretical predictions. We found with high statistical significance (p < 0.01) that higher levels of atmospheric instability lead to higher coherence between turbines, with wake motions reducing correlations up to 40%. This is attributed to higher dominance of atmospheric motions over wakes in strongly unstable flows. Good agreement resulted with the use of an empirical model for wake-added turbulence to predict the variation of turbine power coherence with ambient turbulence intensity (R 2 = 0.82), though other empirical relations may be applicable. It was shown that improperly accounting for turbine–turbine correlations can substantially impact power variance estimates on the order of a factor of 4.


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35 viewsCategory: Biophysics, Biotechnology, Physics
 
Energies, Vol. 12, Pages 1487: Microgrid-Level Energy Management Approach Based on Short-Term Forecasting of Wind Speed and Solar Irradiance (Energies)
Energies, Vol. 12, Pages 1485: Formation Damage Avoidance by Reducing Invasion with Sodium Silicate-Modified Water-Based Drilling Fluid (Energies)
 
 
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