Hysteresis controller based fault current interruption using DVR

The paper proposes an alternative control strategy for downstream fault current interruption using a dynamic voltage restorer (DVR). In case of downstream fault large fault current will flow through DVR. And if DVR is not effectively limited it may result in voltage sag at PCC, leading the fault condition further worse. So as to control the drift of huge line current, thereby to reimpose the PCC voltage and to defend the DVR elements, a fault controlling concept is suggested for downstream fault and coupled with DVR operation. The proposed controller achieves fault current limitation by magnitude control of its injection voltage. The study results performed in the MATLAB/SIMULINK platform indicates that the discussed scheme could control the fault current value to less than nominal load current value and restores the voltage magnitude at point of connection within less time.