Harmonic mitigation techniques for Enhancing power quality using Decoupled double synchronous Reference frame theory

Abstract

In recent years, the use of power electronic converters, in industrial as newlinewell as domestic applications is consistently increasing with high level of newlineautomation for enhancing the efficiency of energy transfer. Most of the times, newlinethese converters generate harmonic current and induce reactive power in the newlinesystem thereby causing the issues of reduction in power quality. Hence it is newlinenecessary to minimize the harmonics below the assured limit so as to avoid newlinethe power quality problem using suitable techniques. The unreliability in newlineharmonic mitigation is caused due to voltage fluctuation, non-linear loads, newlineutilization of power switches, etc. Also, the cost expensive filters are required newlineto provide smooth and fast response in order to secure the power system newlineduring dynamic condition. Nowadays the traditional power control theories newlineutilize Multilevel Inverters for unreliable operation under unbalanced load newlineconditions. newlineInitially, a repetitive-based control is implemented in the three-phase newlineshunt active power filter to compensate the harmonics. The voltage newlinedetection and the performance of the proposed repetitive based control newlinetechniques are tested by performing simulation using MATLAB Simscape newlinePower System Toolbox. The repetitive-based control method regulates the newlinepower flow at fundamental frequency and the self-charging functionality is newlinealso implemented by the control technique, when the active filter is not newlineassociated with the distributed generation system. The effectiveness and newlinethe feasibility of the proposed control technique in compensating the newlineharmonic voltages at the point of common coupling are also demonstrated in newlinethe simulation. The results of the repetitive-based control in the newlinecompensation of harmonic voltages at the PCC (Point of Common Coupling) newlineusing active power filter clearly demonstrates that THD is reduced from newline30.07% to about 4.36%. newline