Frequency control scheme with dynamic droop characteristics of a DFIG for mitigating the frequency fluctuations

Abstract

Summary 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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“…This study was concluded that the proposed approach is more successful in improving the maximum rate of frequency change and frequency nadir under varied disturbance sizes, even with fluctuating wind speed. In [137], Yang et al presented an improved frequency control strategy using dynamic droop coefficients of type 3 WECS that effectively mitigates system frequency variations. The results of simulation were indicated that the proposed frequency control method is useful to enhance the capability of frequency regulation under several patterns of wind speed and the penetration levels especially for power systems with highly wind generation.…”