Eventos Anais de eventos
ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
Influence of turbine rotor diameter on the cost of energy of utility-scale wind farms
Submission Author:
Michel Kumimoto , SC
Co-Authors:
Michel Kumimoto, Jhoseny Santos, William C. Radünz, Júlio Passos
Presenter: Michel Kumimoto
doi://10.26678/ABCM.ENCIT2020.CIT20-0311
Abstract
The improvement of technologies in the area of materials, the project of components, and computational simulations have been making possible the increase of both the wind turbines’ rotors size and its lifetime, with estimations going from 20 years to 25 years already. Furthermore, the advances in the wind farms projects have been evolving and allowing to increase the number of layout options as a consequence. Looking forward to finding out the advantages of choosing a larger rotor diameter, it was obtained data from two Greek wind farms located on complex terrain, both with the same wind turbines manufacturer and power (Gamesa 2 MW), but with different diameters: site A with 12 turbines and 90 m of rotor diameter, and site B with 8 wind turbines and 114 m of rotor diameter. Therefore, the swept area of one single wind turbine from site B is 60 % larger than from the site A. Furthermore, in order to obtain the wind map, roughness, and power densities in the study area and estimate the annual production of the parks, MERRA-2 wind reanalysis data were used together with information of topography, local vegetation, layout and model of the wind turbines. The results show the capacity factor, from both wind farms A and B, of 0.4 and 0.5, respectively, even though site B has a nominal power of 16 MW and mean wind speed of 7.6 m/s and the corresponding values from site A are 24 MW and 8.1 m/s. Therefore, it concludes that the choice of bigger wind turbines, together with the technological advances on the project of blades and new wind farms layouts, results in a reduction of the cost of energy.
Keywords
renewable energy, wind, Rotor diameter, Capacity factor, Complex terrain
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