Abstract

Voltage dip can be compensating by using the Dynamic Voltage restorer (DVR). DVR works on the basis of the series mitigation technique and power electronics based devices are used in the technique. The required amount of voltage, for power quality mitigation is supplied by DVR and the supplied amount in the DVR is controlled by various controlled technique. In this paper various control techniques for a DVR circuit is discussed. The various control techniques such are; energy optimization technique, hybrid technique, in-phase compensation techniques, phase shift method, advanced phase shift and Pre-Sag compensation technique are compared for voltage sag compensation and suggested better technique.