Abstract
This paper presents a harmonic analysis in terms of Total Harmonic Distortion (THD) and Fast Fourier transformation (FFT) for a Nine level cascaded H-Bridge Multi level inverter(CHB-MLI) with phase shift PWM and level shifted PWM. The performance indices of the proposed system are simulated using PSIM and tabulated. Various level shift PWM techniques like Phase Displacement (PD), Phase opposition Displacement (POD), Anti Phase opposition Displacement (APO), variable frequency (VF) and Carrier overlap (CO) is discussed. It is inferred from the simulation that THD and FFT of COPWM is low.
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