THIRD HARMONIC INJECTION TECHNIQUE FOR DYNAMIC VOLTAGE RESTORER WITH REPETITIVE CONTROLLER

This paper presents THPWM technique for DVR to improve dc link utilization. The repetitive controller to compensate voltage sag, voltage unbalance voltage and current harmonics is discussed in this paper. The graphical facilities available in PSCAD/EMTDC are used to carry out all modeling aspects of repetitive controller with SPWM and THPWM technique. From the simulation results it is seen that there is 15% increase in dc link utilization using THPWM for given system