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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Thermal Engineering and Energy Conversion Stream

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