Abstract
Currently, the application of variable wind speed machines, especially doubly-fed induction generator (DFIG) becomes very effective in the fast growing wind generator (WG) market due to its advantageous property of partial converter ratings and ability to adapt to variable wind speed. The foremost concern for the DFIG based WG system is to maintain the transient stability during fault, as the stator of the DFIG is directly connected to the grid. In this paper, a simple controller based resistive solid-state fault current limiter (R-type SSFCL) is proposed to augment the transient stability of the DFIG based WG system. In simulations, temporary balanced and unbalanced faults were applied in the test system model to investigate the R-type SSFCL transient stability performance. A series dynamic braking-resistor (SDBR) and an LR-type solid-state fault current limiter (SSFCL-LR) are also considered to compare their performance with the proposed R-type SSFCL. These simulations were performed with Matlab/Simulink software. Simulation results clearly indicate that the R-type SSFCL enhances the transient stability of the DFIG system and it works better than the SDBR and SSFCL-LR in every aspect.
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