Transient Stability and Fault Current Reduction of SPP with Bi-2212 SFCL Considering Recovery Time

This paper presents the recovery time characteristic of BSCCO (Bi-2212) Superconducting Fault Current Limiter (SFCL) on Small Power Producer (SPP) for transient stability and fault current reduction. The Bi-2212 SFCL thermal model including the resistance behavior is investigated to determine the recovery time characteristic on the transient stability. The recovery time of the SFCL is directly obtained by adjusting the shunt reactor to demonstrate the effect of the SFCL recovery. The simulation results reveal that the recovery time of the SFCL depends on the shunt reactance. With the high shunt reactance, the SFCL can more diminish the fault current than the one from the low shunt. Nevertheless, the stability margin will be decreased leading to the out of step condition of generator. For this reason, this paper also proposes the method to find the suitable shunt reactance of the SFCL to accomplish both the transient stability and fault current curtailment.