Three-phase Four-wire Interlinking Converter with Enhanced Power Quality Improvement Feature in Microgrid Systems

This paper presents an advanced three-phase fourwire interlinking microgrid system with improved harmonics reduction feature. Due to the robustness and simplicity features, the time-domain second-order notch-filter equivalent techniques have drawn a great deal of research attention. However, the drawbacks of non-satisfactory harmonics rejection characteristics and dynamic response limit their applications. In this context, this paper proposes an advanced control system with an enhanced harmonics reduction feature for a microgrid application. The proposed control system exhibits superior harmonics reduction feature and better dynamic response than the conventional notch-filter based techniques. In addition, a control scheme is developed for a three-phase power system application which presents higher accuracy in compensating both balanced and unbalanced harmonics. The performance of the proposed system is validated through Matlab/Simulink software. From the results, it is evident that the proposed scheme provides excellent performance in terms of harmonics reduction in microgrid systems.

Key words - grid-connected microgrid, harmonics reduction, notch filter, power management