Multilevel converter for power quality improvement [articol]

Abstract

Today electric power is viewed as a product with certain characteristics which can be measured, predicted, guaranteed, improved etc. So power quality issues have become a major concern for all. In this paper the proposed topology is shown to possess a multilevel converter (ML) with seven level cascaded H bridges (CHB). This converter has been used in a Dynamic Voltage Restorer (DVR), a custom power device for power quality improvement. A three phase single pole seven level converter is designed and controlled using Synchronous Reference Frame (SRF) Theory. The SRF theory uses ABC to DQO transformation to calculate the required compensation voltage. The performance of suggested converter and switching algorithm are validated with simulation. The multilevel inverter injects the voltage and improves the efficiency of the algorithm and mitigating the voltage swell and sag performances are analyzed by MATLAB/SIMULINK software.