Asymmetrical fault ride through capacity augmentation of DFIG based wind farms by parallel resonance fault current limiter

Doubly fed induction generator (DFIG) based wind farms faces challenge to maintain fault ride through (FRT) as they are vulnerable to the grid faults. The asymmetrical faults are also problematic like the symmetrical faults, as the asymmetrical faults introduce electromechanical stress on turbine generator systems and may cause grid code violation. To augment the asymmetrical FRT capacity and handle the asymmetrical faults, a parallel resonance fault current limiter (PRFCL) is proposed. To check the effectiveness of the proposed PRFCL, double-line-to-ground (2LG), line-to-line (2L) and single-line-to-ground (1LG) faults were applied to the multi-machine power system where the DFIG based wind farm is connected. Performance of the PRFCL is compared with that of the bridge-type fault current limiter (BFCL). Simulations executed in Matlab/Simulink show that the PRFCL is a very effective auxiliary device to augment the asymmetrical FRT capacity and outperforms the BFCL.