Comparative Analysis of Spwm Methods Using Single Phase Three Level H-bridge Cascaded Inverter

This paper presents Simultaneous variation and control of the output voltage and frequency, reduction in the harmonic components in load currents. These inherent features have to be employed in many industrial applications such as variable speed drives, uninterruptible power supplies and other power conversion systems. However, the reduction of the harmonic components in output currents and voltage is still the focus of major interests to mitigate the influence of electromagnetic interference (EMI) or noise and vibrations. Three level inverter MATLAB module is designed with different controlling schemes like PD, POD and, APOD which are used to control THD. It generates smaller commonmode (CM) voltage thus reducing the stress in the motor bearings. It can generate output voltage with extremely low distortion and draws input current with very low distortion. KeywordsSPWM, PD, POD, APOD, THD, CHB-MLI.