Análise de conversor multinível com células em cascata de fonte dividida (split-source) aplicado à sistemas fotovoltaicos

Abstract

The exponential growth of distributed generation has driven the developing of new Technologies for grid connection. Among them, the converters and control strategies are constantly improved in order to guarantee high efficiency, good dynamic performance and quality of output harmonic content. The Split-Source Inverter (SSI) was proposed as a alternative for the Impedance-Source Inverter (ZSI). Furthermore, several multilevel topologies have been originated from the ZSI including the Cascaded Multilevel Inverter (CMI), however, the CMI has not been investigated for the SSI. Therefore this paper proposes a control strategy for the SSI-CMI. Therefore this document firstly provides a bibliographical review with theoretical basis of the basic concepts for the understanding of the main works involving DC/AC converters, with the purpose of presenting the feasibility analysis of the structure of two SSI inverter modules in cascade system operating in a symmetrical multilevel converter, also proposing dynamic system modeling, variable control and MPPT (Maximum Power Point Tracking) strategy for application in photovoltaic systems grid-connected. Finally, simulation results are presented to validate and demonstrate the performance of the proposed system.