Abstract



A relation between Cost Of Energy, COE, maximum allowed tip speed, and rated wind speed, is obtained for wind turbines with a given goal rated power. The wind regime is characterized by the corresponding parameters of the probability density function of wind speed. The nondimensional characteristics of the rotor: number of blades, the blade radial distributions of local solidity, twist angle, and airfoil type, play the role of parameters in the mentioned relation. The COE is estimated using a cost model commonly used by the designers. This cost model requires basic design data such as the rotor radius and the ratio between the hub height and the rotor radius. Certain design options, DO, related to the technology of the power plant, tower and blades are also required as inputs. The function obtained for the COE can be explored to find those values of rotor radius that give rise to minimum cost of energy for a given wind regime as the tip speed limitation changes. The analysis reveals that isoCOE lines evolve parallel to isoradius lines for large values of limit tip speed but that this is not the case for small values of the tip speed limits. It is concluded that, as the tip speed limit decreases, the optimum decision for keeping minimum COE values can be: a) reducing the rotor radius for places with high Weibull scale parameter or b) increasing the rotor radius for places with low Weibull scale parameter.  
International

Si 
Congress

The science of making torque from wind 

960 
Place

Oldenburg (Alemania) 
Reviewers

Si 
ISBN/ISSN




Start Date

09/10/2012 
End Date

11/10/2012 
From page

1 
To page

2 

Proceedings 