Wind power calculation

How are wind power profiles calculated?

In nPro, the wind speed at hub height of the wind turbine is calculated in a first step. For this purpose, the power law according to Hellmann is used:

Here, $w_\mathrm{hub}$ is the wind speed at hub height, $w_\mathrm{ref}$ the measured wind speed, $h_\mathrm{hub}$ the hub height, $h_\mathrm{ref}$ the reference height at which the reference wind speed was measured, and $a$ the Hellmann coefficient. In a second step, the generation power of the turbine is calculated with power curves from manufacturer data. In Table 1 the power curve of the wind turbine Enercon E141 is illustrated.