Application of solid state fault current limiter on express feeder for voltage sag mitigation

Abstract

Voltage sags during short-circuit faults are one of the major power quality problems and voltage sag mitigation at point of common coupling (PCC) is proposed using solid state fault current limiter (SSFCL). The proposed SSFCL is tested on a practical express distribution feeder, Bajaj hospital in a MATLAB/SIMULINK environment. Proposed SSFCL mitigate voltage sag at PCC for various unsymmetrical/symmetrical faults such single phase-to-ground, phase-to-phase, three phase and two-phase-to ground faults. In present scenario increased demand of electricity has raised short circuit level of power system. Proposed SSFCL also limit fault current significantly and thus reduced short circuit level and electromagnetic stress in associated equipment's. The performance of proposed SSFCL is evaluated in the forms of voltage sag mitigation and suppression of fault current for unsymmetrical/symmetrical faults and it is shown that, SSFCL has tremendous competence of suppressing the fault current and voltage mitigation quasi instantaneously that leads more reliable and stable condition of system.