Application of parallel resonance fault current limiter for fault ride through capability augmentation of DFIG based wind farm

Abstract

Doubly fed induction generator (DFIG) based wind generators are vulnerable to the grid faults, as their stator windings are directly connected to the grid. Fault ride through (FRT) capability of a wind farm is very important, as it is a common requirement by the grid codes practiced all over the world. In this work, to enhance the FRT capability of a DFIG based wind farm, the parallel resonance fault current limiter (PRFCL) is proposed. To check the effectiveness of the proposed PRFCL, its performance is compared with that of the bridge-type fault current limiter (BFCL). A three-phase-to-ground (3LG) fault was applied to one of the double circuit transmission lines at the wind farm connection point of the multi-machine system to investigate the FRT capability. Simulations were carried out in Matlab/Simulink environment. Simulation results show that the PRFCL is a very effective auxiliary device to achieve better FRT. Moreover, it was found that the PRFCL outperforms the BFCL.