Estudo da regeneração de potência e aplicação do capacitor flutuante em um inversor monofásico com topologia NPC.

Abstract

The present work is based on the analysis of single-phase inverters with NPC topology. The effects power regeneration on the NPC/H-Bridge configuration composed by two cells fed by voltage sources with three dc-link voltage ratios (2:1, 3:1 and 4:1) and also the application of a flying capacitor in the hybrid cascaded NPC/H-bridge configuration with a 4:1 dc-link voltage ratio. The PWM technique used will be the Level-Shifted PWM, which is based on levels generation by the inverter. In order to prove the operation of the systems, operating regions, harmonic distortion rates and behavior of the voltages and currents associated with the circuits will be analyzed through simulations performed using MATLAB and PSIM softwares.