Performance Analysis of Cascaded H-Bridge 3L- Inverter Supported Twin D-Statcom for Power Quality Enhancement

Abstract

The growth in power electronics has impacted many loads that traditionally were considered linear. As a result, the number of nonlinear loads has increased and is expected to increase dramatically in the years ahead, which in turn pollutes the power quality and creates problems. This paper discusses harmonics, power quality problems, their analysis and terms defining their limits. To improve power quality, this study compares a twin distributed static compensator (D-Statcom) using a cascaded H-bridge 3L inverter and a 3Phase-2L-VSI (voltage source inverter). Instantaneous Symmetric Component Theory (ISCT) and a PI controller are used in d-Statcom operation to provide the switching signal for these configurations. Instantaneous apparent and reactive powers are also expressed in terms of instantaneous symmetrical components derived from the Clarke transformation. The comparative assessment is used to get to a particular level for the distribution system's power quality improvement. The control techniques, which are designed using MATLAB/Simulink and based on mathematical equations, are controlled by both configurations. In comparison to the 3Phase-2L- VSI and cascaded H-bridge3L inverter-based dual d-Statcom, significant improvements in power quality and reductions in source harmonic current under the influence of problems can be seen using balanced nonlinear load conditions.