Experimental validation of a shunt active filter based on cascaded multilevel inverter with single excited DC source

Abstract

In this paper, a Cascaded H-Bridge Multilevel Inverter (CHBMLI) is proposed and designed with single dc source employing single-phase transformers to operate as a shunt active filter for harmonic reduction. The paper studies the complete architecture and control logic of the proposed multilevel inverter. For harmonic current extraction instantaneous active and reactive current control technique is used in steady state and transient condition. In order to have a better comparison, phase shifted PWM and in phase disposition (IPD) PWM technique are used for the modulation of CHBMLI. Finally a seven level CHBMLI is developed to operate as a shunt active filter. The proposal and performance is validated through simulation and experimental results.