Parallel Connected Common DC-Link Fed DSTATCOM for Power Quality Improvement

Abstract

Power quality is a comprehensive term used to estimate the caliber of the power system in delivering high-grade supply and is an interesting study to ensure customer satisfaction. DSTATCOM is one of the custom power devices used to refine the power system parameters especially to ensure that the source current contains acceptable harmonic limit. Parallel connected DSTATCOM is a topology with two parallel DSTATCOMs connected to the point of common coupling for harmonic reduction in source current and improving the power quality. Each of the two parallel DSTATCOMs has its individual DC storage source to adjust the real power deficit to the system (during load transients). This paper presents a common DC-Link fed parallel DSTATCOM topology for power quality improvement. Unlike the conventional parallel DSTATCOM topology, common DC-Link fed parallel DSTATCOM topology employs only one DC-Link source reducing the number of DC sources, cost and increases reliability. The single DC storage source adjusts the real power deficit to the system. In this paper, IRP control methodology delivers the control pulses to parallel DSTATCOM. The proposed system is tested with variable and constant load operations and the results are presented using MATLAB/SIMULINK software.