Banca de QUALIFICAÇÃO: EDUARDO AUGUSTO OLIVEIRA BARBOSA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : EDUARDO AUGUSTO OLIVEIRA BARBOSA
DATE: 19/12/2022
LOCAL: Sessão por Videoconferência (fechada ao público) https://meet.google.com/pps-prdy-jci
TITLE:

HIGH-GAIN HIGH-EFFICIENCYSEPICCONVERTER WITHTHREE-WINDINGSTRANSFORMER, INVERSECHARACTERISTICANDOPTIMIZEDMAGNETICCOMPONENTS.

KEY WORDS:

d.c.-d;c.; Converters; High-Gain; Photovoltaic Energy.

PAGES: 155
BIG AREA: Engenharias
AREA: Engenharia Elétrica
SUMMARY:

Many industrial and commercial applications demand a high continuous voltage elevationstage. Recently, the growth of the installed electrical power in form of solar photovoltaic energy promotes the study and developmentof d.c.-d.c. converters, responsible for raising the voltage of the photovoltaic modules and to track theirmaximumpower point. Of the possible means to connect the photovoltaic modules to the electrical grid, using a d.c.-d.c. converter each individual module seems attractive, as it enables better usage of the power generated by the modules in partial shading situations. Traditional d.c.-d.c. converters, i.e.: boost, are unable to achieve the needed high voltagegainwith high efficiency, resulting in manyadvanced d.c.-d.c. converter topologiesabletoachieve high static voltage gain with high efficiency being proposed in the literature. This work presents a d.c.-d.c. converter base don the SEPIC converter, utilizing a three-winding transformer and a voltage clamping circuiton the switch to achieve high voltage gain with low component count. By using capacitors to remove the d.c. componen of the current circulating in its windings, the transformer design is optimized, removing the necessity of an air gap and reducing the amount of turns needed in its windings. The high static voltage gain enables the use of lowvoltage switches, which present low conduction resistance. These factors, combined to the low diode count, result in a high-gain, high-efficiency, low complexity and costtopology. The operation stages oft he converter are described and the currentand voltage expressionsof its components are developed, which are validated through computational simulations. The converter model in the frequency domain is also developed, which is usedto design the input voltage controller. Finally, the proposed converter is compared too the rrecently published converters in the literature. 

COMMITTEE MEMBERS:
Externo à Instituição - FERNANDO LESSA TOFOLI - UFSJ
Externo à Instituição - ANTÔNIO MANUEL SANTOS SPENCER ANDRADE - UFSM
Interno - 1146270 - RAFAEL CAVALCANTI NETO