Abstract: Total harmonic distortion (THD) is a term used to describe the net deviation of a nonlinear waveform from ideal sine waveform characteristics. Total harmonic distortion is the ratio between the RMS value of the harmonics and the RMS value of the fundamental. In multilevel Inverter As we try to increase the number of levels THD reduces. This paper contains different single phase multilevel inverter configuration. Different cascaded H bridge type of inverters are pointed out in this paper. Cascaded H bridge type multilevel inverters are built in MATLAB simulation and results are illustrated.

Keywords: Total Harmonic Distortion, Multilevel inverters, Cascaded H bridge.