*2.1. Wind Turbine*

The output power of a wind generator *WTP*(*t*) is a function of wind speed and can be calculated using Equation (1) [42]:

$$WT\_p(t) = \begin{cases} WT\_p^{rtd}(t) \times \frac{u^3 - u\_{\rm in}^3}{u\_{\rm rld}^3 - u\_{\rm av}^3} & u\_{\rm cr} \le u \le u\_{\rm rtd} \\ WT\_p^{rtd}(t) & u\_{\rm rtd} \le u \le u\_{\rm ou} \\ 0 & u < u\_{\rm in} \text{ or } u > u\_{\rm ou} \end{cases} \tag{1}$$

where *uci*, *urtd*, *u* and *uou* are the cut-in speed, nominal speed, instantaneous wind speed at hub height and cut-out wind speed for the wind turbine, respectively. *WTrtd p* is the rated power output of the wind turbine.
