Conversor MPPT de estágio único conectado à rede elétrica baseado no conversor de capacitor flutuante

• Ano de defesa: 2023
• Autor(a) principal: Muller, Guilherme David
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Espírito Santo; BR; Mestrado em Engenharia Elétrica; Centro Tecnológico; UFES; Programa de Pós-Graduação em Engenharia Elétrica
• Palavras-chave em Português: Energia fotovoltaica; MPPT; Conversor multinível capacitor flutuante; Estágio único; Estratégia de controle; subject.br-rjbn; Engenharia Elétrica
• Link de acesso: http://repositorio.ufes.br/handle/10/16747

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 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.