The study on a dual-feed-forward control of DVR to mitigate the impact of voltage sags caused by induction motor starting

Voltage sag caused by induction motor starting is one of the main causes resulting in sensitive equipment dropout. A simulation model of Dynamic voltage restorer (DVR) has been proposed to mitigate voltage sag caused by high-power induction motor starting. The relationship of starting current and voltage sag depth has been discussed in this paper. Based on these analyses, a control strategy, associating power grid voltage and load current, is introduced to verify the voltage compensation performance of DVR. Simulation results show the effectiveness of the control system.