Abstract
The variations of wind generation result in the considerable fluctuations of the system frequency, which are difficult to be regulated in the acceptable range in electric power systems with highly penetrated wind generations. This paper suggests an enhanced frequency control scheme with dynamic droop coefficients of a doubly fed induction generator (DFIGs, type 3) that is able to mitigate the fluctuations of the system frequency with more efficiency. To this end, a supplementary control loop with system frequency-dependent droop control coefficients is employed based on the deviation of the system frequency. Simulation results clearly indicate that the suggested frequency control scheme is benefit to improving the frequency regulation capability under various wind speed patterns and penetration levels as energy storage systems do for frequency regulation, particular in highly wind generation penetrated power systems.
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