Frequency controls of an electric power system must be carefully studied when large amounts of wind power is introduced. Based on the studies on the frequency characteristics of induction motors (IMs)

a voltage sourced interruption generator is developed for IM frequency characteristics studies with different torquespeed characteristics. A generalized IM model is synthesized using the weighted summation technique and wind power generators frequency characteristics are analyzed. Studies on a power system demonstrate that the system frequency deviation is smaller when the wind farms frequency control characteristics are taken into account than not.