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A combined operation of Superconducting Fault Current Limiter and Static Var Compensator for power system transient stability improvement

This paper proposes a combined operation of Superconducting Fault Current Limiter (SFCL) and Static Var Compensator (SVC) for improving the transient stability performance of the interconnected power system. Presently, the SVC has been successfully applied to power system to suppress the voltage fluctuation and to increase the transient stability. Normally, when the fault occurs in the power system network, high short-circuit currents might affect the transient stability performance of the power system. It might be insufficient for improving the effectiveness of transient stability by applying only the SVC. To overcome this issue, this paper applies the SFCL together with the SVC as a combined operation. The simulation results reveal that the combined SFCL and SVC can help limit the severity of short-circuit currents. Moreover, it can help improve the transient stability performance considerably, compared to the one with SVC only. In addition, it is found that a combined operation can reduce the size of SVC significantly, resulting to a lower investment cost.