Özet:

The generator control region in wind turbines is generally hard to represent mathematically. This paper evaluates the accuracy of wind turbine fits for such a region, namely the polynomial, the approximate cubic, and the exponential fits. The study demonstrates how higher-order polynomials are not necessarily more accurate than lower-order ones. Three different wind turbines are modeled, and calculations of the capacity factor and the average produced power are carried out to examine the modeling limitations of the approximate cubic and the exponential fits. Results show that the exponential fit has low accuracy for low wind speeds, especially when the wind turbine curve is \enquote{S-shaped} in the generator control region. The approximate cubic fit is also shown to always over-estimate the annual energy yield of wind turbines.

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