Performance of new solid-state fault current limiter for transient stability enhancement of DFIG based wind generator

Currently, the application of doubly fed induction generator (DFIG) based wind generator (WG) becomes very attractive due to its salient features. Although the DFIG has several advantages but its prime concern is to maintain the transient stability in the event of fault. Therefore, in this work we proposed a new solid-state fault current limiter (N-SSFCL) to improve the transient stability of DFIG based variable speed WG. A temporary Symmetrical and unsymmetrical faults were applied to the 2 MW DFIG based test system model to investigate the improvement of transient stability of the proposed N-SSFCL. In order to check the efficacy of the proposed N-SSFCL, its performance is compared with the inductive-resistive type solid-state fault current limiter (SSFCL-LR), and series dynamic braking resistor (SDBR). Simulations were carried out in Matlab/Simulink software. From all simulation results, it is clear that the proposed N-SSFCL can improve the transient stability of the DFIG system, and performed well in comparison to the SSFCL-LR and SDBR in all aspects.

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