Banca de DEFESA: MICHAEL ARAÚJO SANTOS TEIXEIRA DE JESUS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MICHAEL ARAÚJO SANTOS TEIXEIRA DE JESUS
DATE: 19/01/2024
TIME: 14:00
LOCAL: meet.google.com/ihc-tnrj-zpd
TITLE:

Vector Modulation Strategies for H8 Transformerless Three-Phase Photovoltaic Inverter

KEY WORDS:

Transformerless inverter, photovoltaic systems, grid connected, leakage current reduction, state space vector, modulation, common mode voltage

PAGES: 130
BIG AREA: Engenharias
AREA: Engenharia Elétrica
SUBÁREA: Eletrônica Industrial, Sistemas e Controles Eletrônicos
SPECIALTY: Eletrônica Industrial
SUMMARY:

The global population increase has resulted in an increasingly higher demand for energy, however the majority of energy sources come from non-renewable natural resources such as oil, natural gas and mineral coal. Thus, there is a need to raise awareness about the use of these resources as a way to preserve the environment and also points out the urgency to develop and make use of alternative techniques and projects to supply the need of human beings in a productive way, non-polluting and low cost. A possible resource in energy generation comes from solar energy, which means that photovoltaic solar energy is in constant increase and development, making it possible to have a photovoltaic system even in a small house and connect it to the electricity distributor's grid so that the consumer can have a reduction on their energy bill. These systems are mainly composed of photovoltaic panels and energy converters. One of the common problems with these photovoltaic systems is the emergence of parasitic capacitances between the photovoltaic panels and the ground, thus generating a leakage current that contributes to the electrical insecurity of the entire installation. To solve this problem, transformers can be used to perform galvanic isolation between the panels and the grid. However, the addition of this equipment increases losses, cost and the size of the system. The use of a three-phase transformerless inverter in grid-connected photovoltaic systems presents an economical and compact solution, but with the presence of a high leakage current. To solve this problem, several topologies are proposed and combined with modulation techniques to reduce the leakage current. The present work proposes four space vector modulation techniques applied to a transformerless three-phase inverter topology to reduce the leakage current through the assignment of a new spatial vector, where the common mode voltage will have a smaller or zero variation in certain regions. Simulation results are presented to demonstrate the performance of the new modulation techniques.

COMMITTEE MEMBERS:
Presidente - 3161890 - FILIPE ANTONIO DA COSTA BAHIA
Interno - 1666309 - FABIANO FRAGOSO COSTA
Externo à Instituição - JOÃO PAULO RAMOS AGRA MÉLLO