The necessary distance between large wind farms offshore - study

The method is analytical and encompasses both small wind farms and wind farms extending over large areas. As it is often the need for offshore wind farms, the model handles a regular array-geometry with straight rows of wind turbines and equidistant spacing between units in each row and equidistant spacing between rows. Firstly, the case with the flow direction being parallel to rows in a rectangular geometry is considered by defining three flow regimes. Secondly, when the flow is not in line with the main rows, solutions are found for the patterns of wind turbine units emerging corresponding to each wind direction. The presentation is an outline of a model complex that will be adjusted and calibrated with measurements in the near future.

[1]  J. Højstrup,et al.  Full scale measurements in wind turbine arrays , 1993 .

[2]  H. Schlichting,et al.  Boundary Layer Theory, Sixth Edition , 1968 .

[3]  Stefan Emeis,et al.  Reduction of horizontal wind speed in a boundary layer with obstacles , 1993 .

[4]  W. Elliott,et al.  The growth of the atmospheric internal boundary layer , 1958 .

[5]  H. Schlichting Boundary Layer Theory , 1955 .

[6]  B. G. Newman,et al.  The spacing of wind turbines in large arrays , 1977 .

[7]  J. Lumley,et al.  A First Course in Turbulence , 1972 .

[8]  Niels Gylling Mortensen,et al.  Response of neutral boundary layers to changes of roughness , 1990 .

[9]  J. Højstrup,et al.  A Simple Model for Cluster Efficiency , 1987 .

[10]  P. D. Dunn,et al.  The efficiency of wind turbine clusters , 1980 .

[11]  Rebecca J. Barthelmie,et al.  Modelling of Offshore Wind Turbine Wakes with the Wind Farm Program FLaP , 2003 .

[12]  Peter Hauge Madsen,et al.  Spatially average of turbulence intensity inside large wind turbine arrays , 2003 .

[13]  Jørgen Højstrup,et al.  A simple model for the adjustment of velocity spectra in unstable conditions downstream of an abrupt change in roughness and heat flux , 1981 .

[14]  Sten Tronæs Frandsen,et al.  On the wind speed reduction in the center of large clusters of wind turbines , 1992 .

[15]  Julio Hernández,et al.  Measurements on and modelling of offshore wind farms , 1996 .

[16]  Niels Otto Jensen,et al.  Change of surface roughness and the planetary boundary layer , 1978 .

[17]  J. Schepers ENDOW: Validation and improvement of ECN's wake model , 2003 .