Name: GUILHERME DAVID MULLER

Publication date: 08/02/2023
Advisor:

Name	Role
DOMINGOS SÁVIO LYRIO SIMONETTI	Advisor *

Examining board:

Name	Role
ARTHUR EDUARDO ALVES AMORIM	External Examiner *
DOMINGOS SÁVIO LYRIO SIMONETTI	Advisor *
WALBERMARK MARQUES DOS SANTOS	Internal Examiner *

Summary: Considering the current trend of growth of systems based on renewable energy sources, mainly photovoltaic distributed generation (DG’s), new topologies of DC-AC converters are being developed for conversion systems with a focus on multilevel converter structures, in order to to increase efficiency at the lowest possible cost. This work describes a literature review on photovoltaic energy processing, including the operation of the solar system, MPPT methods, types of converters used and modulation strategies. After the review, a new grid-connected single-stage DC-AC inverter topology is presented, inspired by the
flying capacitor multilevel converter cell. All components of the proposed converter were dimensioned and, for validation, a simulation structure was developed using the MPPT control through the incremental conductance algorithm acting only on the modulating signal angle, with unit modulation index. As a modulation strategy, PWM modulation with two phase shifted carriers (PS-PWM) was used. The system was simulated in the MATLAB®/Simulink environment for a 6.4 kW photovoltaic system at 25 ◦C and
subjected to changes in irradiance to analyze the behavior and performance of the converter.

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