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All Journal International Journal of Power Electronics and Drive Systems (IJPEDS)
Bedri Dragusha
University of Prishtina, Kosovo
Control & Systems Engineering Electrical & Electronics Engineering

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Impact of field roughness and power losses, turbulence intensity on electricity production for an onshore wind farm Bedri Dragusha; Bukurije Hoxha
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 11, No 3: September 2020
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (528.719 KB) | DOI: 10.11591/ijpeds.v11.i3.pp1519-1526

Abstract

When designing a power generation project from a different source, and in our case study, wind, when calculating the annual energy produced, it is necessary to define and calculate the losses incurred in the system.  The main cause of losses in a wind park is due to the oscillations caused by the turbulence of the air around the turbine because of roughness of terrain. The paper describes two methods of estimating turbulence intensity: one based on the mean and standard deviation (SD) of wind speed from the nacelle anemometer, the other from mean power output and its SD. These analyses are very important for understanding the fatigue and mechanical stress on the wind turbines. Then significance of the site ruggedness index (RIX) and the associated performance indicator (ΔRIX) are confirmed for terrain and the consequences of applying WAsP outside its operating envelope are quantified.
The optimal order configuration of turbines in a small hydropower plant: A case study of the Lepenci River in Kosovo Arlinda Bresa; Bedri Dragusha; Xhevat Berisha; Rexhep Selimaj
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 13, No 3: September 2022
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijpeds.v13.i3.pp1675-1683

Abstract

Decentralized electricity production from small hydropower plants used for domestic and ancillary services has been established among the most reliable renewable energy sources for isolated locations. However, many factors impact the energy efficiency and the production capacity of such hydropower plants, one of these factors being the order configuration of the connected turbines. Hence, this research presents a performance evaluation of a small hydropower plant consisting of three francis turbines, and it elicits the optimal order configuration of the connected operating turbines, that yields the highest power output under varying conditions. Three scenarios with different order configurations of turbines are presented and compared in a “run-of-the-river” setting, installed in the Lepenci River, in south-eastern Kosovo. Numerical analyses are used to evaluate the performance of each scenario. The results show that the order configuration of the operating turbines based on their connection order has a significant impact on the electricity production.
Co-Authors Arlinda Bresa Bukurije Hoxha Rexhep Selimaj Xhevat Berisha