Consideration of tip speed limitations in preliminary analysis of minimum COE wind turbines

The Science of Making Torque from Wind 2012

Cuerva-Tejero, A.^1 ; Yeow, T.S.^1 ; Lopez-Garcia, O.^1 ; Gallego-Castillo, C.^2

Instituto Universitario de Microgravedad Ignacio da Riva, E.T.S.I.Aeronáuticos, Universidad Politécnica de Madrid, Madrid

E-28040, Spain^1

Departamento de Vehículos Aeroespaciales, E.T.S.I. Aeronáuticos, Universidad Politécnica de Madrid, Madrid

E-28040, Spain^2

关键词: Cost modeling;    Cost of energies;    Design option;    Optimum decision;    Preliminary analysis;    Radial distributions;    Rated wind speed;    Weibull scale parameters;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/555/1/012020/pdf
DOI  :  10.1088/1742-6596/555/1/012020

来源: IOP

【 摘 要 】

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 characterised by the corresponding parameters of the probability density function of wind speed. The non-dimensional 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 iso-COE lines evolve parallel to iso-radius 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.