Very short-term wind speed prediction-based inertial control of a DFIG wind farm

Abstract

Rapid growth of wind power penetration brings difficulties in maintaining the power system frequency stability after a large active power disturbance. It is specified in some countries that wind farms must provide frequency support functions. To properly exploit the kinetic energy stored in the doubly fed induction generator (DFIG) to support the frequency regulation, especially considering the realistic wind speed variation during the transient process, a very short-term wind speed prediction (VSWSP)-based inertial control scheme is proposed in this paper, including the rate of change of frequency (ROCOF) and droop loops. Two loop gains are adjusted based on the predicted average wind speed in the future 10 seconds, which enables the inertial control adaptive to the wind speed variation during the transient process. Simulation results indicate that the proposed scheme shows better performance than conventional fixed gain scheme in terms of improving the frequency nadir and preventing the DFIG from over-deceleration during the inertial control.