Wind Resource Assessment at Adama II Wind Farm Using Wasp
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Date
2014-06
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Addis Ababa University
Abstract
This paper presents the Estimation that has been undertaken in order to quantify the wind
resource available at Adama II Wind Farm using the Wind Atlas and Application Program
(WAsP). It was made through retrieving the data measured by anemometer and wind vanes at
Kusaye site which is stored in a data logger from 16/11/2011 to 9/12/2012 at 70 meters above
ground level.
Establishment of Wind Farm is asserted by estimation of wind resource at a given site, applying
wind flow modeling methodologies. The source data at Adama II Wind Farm indicated that the
mean wind speed is 8.62 m/s whereas the emerged mean wind speed and the mean wind power
density were obtained to be 8.66 m/s and 440 W/m2, respectively, at 70 m. Site independent or
regional wind climate has also been calculated for five roughness classes and five standard
heights along with all sectors of a Wind Rose to estimate the wind climate at the site through
utilizing the characteristics of Sany SE7715 Wind Turbine Generator.
The results of the assessment presented that the prevailing wind direction is ENE direction with
more than one third of wind is blowing in ENE. From the recorded data at 70 m, the mean wind
speed at 50 m is estimated to be 8.22 m/s, which suggests that the wind resource at Adama II is
wind class of 6. At the mast location for a single WTG the wind power density is 452 W/m2 and
the Gross Annual Energy Production ranges from 1.5 to 11.99 GWh at 70 m height. Placing the
102 SE7715 WTGs in accordance with the proposed layout at the Wind Farm, the Gross Annual
Energy Production is 664.745 GWh and net AEP at the site is 403.669 GWh. After repositioning
the WTGs to potential locations, the net AEP is estimated to be 478.786 GWh, an increment of
75.12 GWh on the Net Annual Energy Production, an increase of about 18.6 %.
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Keywords
Thermal Engineering and Energy Conversion Stream