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Power problems affecting today’s technological equipments are often generated locally within a facility from many number of situations. The major problem of the power quality is voltage sag. In this paper, Dynamic Voltage Restorer (DVR) is implemented using diode clamped multilevel inverter with phase disposition pulse width modulation. In the existing system, the various hysteresis modulation approaches are available in multilevel inverters. Since the number of levels of the inverter is increased, a new technique called phase disposition PWM is proposed. In this technique the carrier amplitude is increased and compared with the original signal to generate the pulses. The voltage sag problem can be rectified by DVR with corresponding time period. The main aim is to improve the power quality of the load voltage. The simulation is carried out using MATLAB/SIMULINK software and the results are presented and discussed in this paper.

DVR using Diode Clamped Multilevel Inverter with Phase Disposition Pulse Width Modulation Technique