Flexible Frequency Response Strategy with Smooth Rotor Speed Recovery of a DFIG-Based Wind Turbine

Grid frequency must be regulated in its nominal range to guarantee the stable operation of an electric power grid. Excessive grid excursions result load shedding, instability, or even synchronous generator damage. With growing wind penetration, there is increasing issue about reduction inertia response. This paper addresses a self-adaptive inertial control strategy for improving nadir and smoothly regaining rotor speed initial working condition without causing second drop (SFD). The first objective achieved by determining incremental considering maximum rate change frequency; secondary goal realized decreasing reference based on function. Simulation results verify that proposed not only boosts but also guarantees smooth recovery with negligible SFD.