Abstract: A switched capacitor based multilevel inverter employing asymmetric source configuration is proposed. Multilevel inverters are mainly used to improve the harmonic profile of the output by increasing the number of levels. Due to the advancement in renewable energy, asymmetrical DC voltage sources are more common. The significant reduction in switch count of multilevel inverters has served as the greatest advantage over years. Various modulation schemes have been proposed in the literature to enhance the performance of multilevel inverters. This include Sinusoidal PWM (SPWM), Space Vector Modulation (SVM), Selective Harmonic Elimination (SHE) etc. The switching strategies used for the control of switches influence the harmonic content of output voltage. Most of the modulation techniques, however contributed less in reducing the distortion at the output. In order to control the noise signals, lower order harmonics should be controlled. A modified Reduced carrier PWM scheme is proposed to control the harmonic content of the output voltage and thereby reduce the Total Harmonic Distortion. The simulation of the proposed system is modelled and evaluated with desirable results in MATLAB/Simulink.

Keywords: Switched-capacitor, H-Bridge, multilevel inverter, high frequency inverter, Total Harmonic Distortion, Reduced carrier PWM

| DOI: 10.17148/IJIREEICE.2019.7213