Frequency Support of Grid Connected Wind Turbine Based-DFIG

The increase of the penetration levels of renewable energy sources (RES) in the interconnected grid poses a challenge for system operators. The variability inherent to RES such as wind power may cause key system parameters to trip outside of the allowable thresholds stablished by the grid codes. The objective of this work is to investigate the ability of wind farms equipped with Doubly Fed Induction Generators (DFIG) to participate in the primary frequency control of the grid. Three control strategies are implemented in the Rotor Side Converter (RSC) of the DFIG: inertia control, droop control and deloading and their performance are evaluated after a frequency disturbance occurs. For each of the considered strategies, multiple parameters were tested to identify how each strategy impacts the electric grid. The resulting analysis helps to determine if it is possible to perform the primary frequency control of an interconnected grid with RES.