Utilize este identificador para referenciar este registo: http://hdl.handle.net/10362/7083
Título: PV inverters for module level applications
Autor: Barbosa, José Nilton Tavares
Orientador: Martins, João
Pina, Luis
Palavras-chave: Inverters
Microinverters
Photovoltaic
Power electronics
Renewable energies
Data de Defesa: Set-2011
Editora: FCT-UNL
Resumo: Nowadays, the photovoltaic (PV) energy is presented as one of the most promising source of clean energy, and so a good way for greenhouse gas emissions mitigation and reduce the fossil fuel dependence. Within it, the photovoltaic energy has caused a huge interest in the electronic converters, and the need to improve their efficiency and reducing their cost. With this work I present a solution for a module scale grid-connected single-phase inverter. The solution consists in a two-stage inverter insolated with a grid line transformer. The two-stage inverter is composed by a DC-DC converter and a DC-AC converter connected through a DC-link capacitor. The DC-DC converter in case is a boost converter used to elevate the voltage from the PV module to a higher level. For the DC-AC converter it is used a full-bridge inverter, and both the DC-DC and the DC-AC converters use the IGBTs form an integrated module with its respective drivers. To the boost control it is implemented a Maximum Power Point Tracking algorithm that can optimize the power extraction from the PV source and for the inverter it is used a sliding mode hysteretic control. Once this inverter is conceived to work connected to the grid, a single-phase PLL system is used to synchronize the injected current to grid voltage. All the control part is made digitally using an Arduino Uno board, which uses an Atmel microcontroller.
Descrição: Dissertação para obtenção do Grau de Mestre em Energias Renováveis – Conversão Eléctrica e Utilização Sustentáveis
URI: http://hdl.handle.net/10362/7083
Aparece nas colecções:FCT: DEMI - Dissertações de Mestrado

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