Designs synthesis of resonant fault current limiter for voltage sag mitigation and current limitation

Recently, due to the influx of digital computers and other types of electronics controls, electric utilities are paying more attention to voltage sag mitigation. Solid-state fault current limiters (FCLs) have been proposed as a means for sag mitigation in the literature. However, not all FCL configurations are suitable for sag mitigation. This paper presents the shortcomings (transient complications) introduced by the thyristor-controlled resonant FCL proposed by G.G. Karady in the literature. In addition, two modified versions of the resonant FCL, with sag mitigation and fault current limiting capabilities, are proposed for use on distribution systems. Sensitivity analysis is then performed on the modified FCLs to determine the effects of component and network parameters on the current limiter performances.