POWER QUALITY IMPROVEMENT USING REPETITIVE CONTROLLED DYNAMIC VOLTAGE RESTORER FOR VARIOUS FAULTS

Abstract

In this work a repetitive controller has been used in the control system of the DVR to compensate for key power quality problems namely voltage sags, harmonic voltages and voltage imbalances. This control system contains a feed forward term to improve the transient response and a feedback term to enable zero error in steady state. This paper proposes to verify results given for a line to line fault in the reference and extends to conduct three phase fault and single line to ground fault. All results are presented and analysed. MATLAB/SIMULINK software is used for simulation. The Simulation results shows that the repetitive control approach performs very effectively and yields excellent improvement in voltage quality problems.