Abstract
Photovoltaic (PV) energy conversion becomes main focus of many researches due to its promising potential as energy source for clean electricity production. One of the important aspects that should be considered in PV application is the use of grid connected multilevel inverter. The Neutral Point Clamped Multilevel Inverter (NPC-MLI), the Flying Capacitor Multilevel Inverter (FC-MLI), and the Cascaded H-Bridge Multilevel Inverter (CHB-MLI) are the three widely used configurations of multilevel inverters. This paper presents the simulation and comparative analysis of the three topologies of three phase 3-level inverter. The multi-carrier sinusoidal pulse width modulation (SPWM) technology is used to realize the closed-loop control model of the photovoltaic grid-connected system. The output waveforms of multilevel inverters are presented and their comparison is based on the total harmonic distortion (THD) present in the output voltage. All topologies are simulated using MATLAB/Simulink in the same operating conditions.
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