Name: Vinicius Secchin de Melo
Type: PhD thesis
Publication date: 27/08/2020
Advisor:

Name Rolesort descending
Walbermark Marques dos Santos Advisor *
Jussara Farias Fardin Co-advisor *
Walbermark Marques dos Santos Co-advisor *
Lucas Frizera Encarnação Co-advisor *

Examining board:

Name Rolesort descending
Walbermark Marques dos Santos Advisor *
Jussara Farias Fardin Co advisor *
Lucas Frizera Encarnação Co advisor *
Denizar Cruz Martins External Examiner *
Cassiano Rech External Examiner *
Jose Luiz de Freitas Vieira External Examiner *
Gilberto Costa Drumond Sousa External Examiner *
Domingos Sávio Lyrio Simonetti Internal Examiner *

Summary: In the current power scenario it has becoming increasingly important to use alternative energy sources in order to contribute to the electrical system. Research and improvement of new power inverters topologies are essential to ensure the viability of renewable sources of energy in distributed generation systems, as well as in the use in remote locations suchas isolated systems. In this occasion, power electronics is essential. In cases such as of photovoltaic systems, normally they produce low DC output voltages levels that need boost
them to be converted into AC for conect to the grid or an isolated load. Many of these applications use two converters, the first stage uses a DC-DC boost converter and the second stage, a DC-AC converter. The topology presented in this paper became possible to conect source and load with a single stage, WHERE the boost and inversion operations will be performed AC output voltages in the desired amplitudes and frequencies. The inverter will use three Buck-Boost DC-DC converters cells, WHERE each one will follow specific references.
The three-phase voltages will be available taking the outputs of the DC-DC Buck-Boost converters diferentialy. State space averaging model will be used to modeling the proposed inverter. In order to validate the dynamic behavior of the inverter operating in different scenarios, numerical computer and dedicated power electronics software simulations will be performed. A monophase model will be proposed, and from this, a methodology for the calculation of the inductors and capacitors of the will be presented based on the dynamic behavior of the inverter. Experimental results will be shown to validate the theoretical analises and electronic simulations by a 250 W power prototype feeding an RL load with a power factor of 0.86.

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