Modulation Technique Applied for THD Reduction in 3-level Flying Capacitor Multilevel Inverter

Abstract

This paper introduces a modulation technique for a three-level flying capacitor multilevel inverter applied in THD reduction. The proposed modulation improves power quality, reducing the total harmonic distortion and combining the advantages of two modulation techniques: HE-PWM and CSV-PWM. In order to validate the proposed method, the THD analysis, the loss study and the experimental results are shown concerning a three-level 6 kW 0.92 power factor flying capacitor inverter. The experimental results presented line voltage THD around 42.09% and phase voltage THD around 79.06%.

Keywords

• Flying capacitor
• modulation technique
• multilevel inverter
• THD analysis
• THD reduction