Fast Frequency Support of a DFIG Based on Over-Speed De-loaded Curve

Abstract

This paper addresses a fast frequency support scheme of a doubly-fed induction generator (DFIG) based on overspeed de-loaded curve that is able to boost the frequency nadir and settling frequency, and reduce the maximum rate of change of frequency (ROCOF) with more efficiency. To address this, a novel power function is employed that increases the power to the torque limit and then decreases with the rotor speed toward to the maximum power point tracking operating conditions. Simulation results on various wind power penetrations clearly indicate that the proposed fast frequency support scheme is benefit to boost the frequency nadir and settling frequency, and reduce the ROCOF.