Banca de DEFESA: RONNAN DE BRITO CARDOSO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : RONNAN DE BRITO CARDOSO
DATE: 15/08/2023
TIME: 08:30
LOCAL: Sessão por videoconferência. Video call link: https://meet.google.com/eoz-sepq-mtd
TITLE:

SWITCHED-CAPACITOR BOOST SEVEN-LEVEL INVERTER.

KEY WORDS:

Multilevel converters, switched-capacitor, active neutral point clamped converters, seven-level topologies.

PAGES: 97
BIG AREA: Engenharias
AREA: Engenharia Elétrica
SUMMARY:

The objective of this thesis work was to present two new inverter topologies capable of synthesizing seven voltage levels. These topologies, use a floating capacitor per phase and a single dc-link. for single-phase and three-phase operations. The inverters used were defined as voltage boosters, with the possibility of increasing the gain with the integration of the switched-capacitor concept in structures with active neutral point clamped. With these characteristics, there was a preference for use in single-stage systems, in which the voltage levels at the input and output are very different, as in the case of photovoltaic panels, batteries, or fuel cells. The proposed topologies can synthesize the output voltage with specifications similar to those of conventional seven-level inverters but with a reduction of the input voltage to one-third. This voltage reduction brings with it some advantages, such as the reduction of voltage stresses on semiconductor devices and capacitors in the structure. The voltages on the capacitors making up the dc-link were naturally balanced, and the floating capacitor achieved voltage balancing through the switched-capacitor principle. As a result, automatic voltage regulation occurred based on a simple modulation strategy, dispensing with the use of sensors and/or additional circuits. In addition, the proposed topologies were able to operate in the entire power factor range, either draining or supplying active and reactive power. The operation, static analysis, design considerations, and loss analysis of the proposed topologies are presented. Simulation and experimental results are included to show the functionality of the proposed topologies.

COMMITTEE MEMBERS:
Externo à Instituição - THIAGO BATISTA SOEIRO
Externo à Instituição - CASSIANO RECH - UFSM
Externo à Instituição - EDISON ROBERTO CABRAL DA SILVA - UFPB
Interno - 2921718 - FABRICIO BRADASCHIA
Presidente - 2378833 - MARCELO CABRAL CAVALCANTI