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Abstract(s)
O desenvolvimento exponencial dos dispositivos eletrónicos de potência tem um
impacto significativo no desenvolvimento de sistemas de distribuição de energia em
corrente contínua (DC), visto que as micro-redes em DC podem levar a uma integração
mais eficiente de sistemas de microgeração descentralizados. As micro-redes DC têm
atraído atenção significativa, tanto na academia quanto na indústria, pois demostram
superioridade sobre as micro-redes em corrente alternada (AC) no que diz respeito à
fiabilidade, à eficiência, à simplicidade de controlo e à integração de fontes de energia
renováveis e de cargas DC. Apesar de inúmeras vantagens, a implementação de um
sistema de proteção apropriado a micro-redes DC continua a representar um desafio
significativo. Para além do extraordinariamente rápido aumento das correntes de falha,
a ausência de passagem por zero da corrente num sistema DC constitui um importante
entrave à adoção de micro-redes em DC. Nesta dissertação são abordados e analisados
métodos de proteção do estado da arte, sendo desenvolvido um sistema de protecção
híbrido, de arquitetura simples.
The exponential development of power electronic devices has a significant impact on the development of direct current (DC) power distribution systems, as DC microgrids can promote a more efficient integration of distributed microgeneration systems. DC microgrids have attracted significant attention in both academia and industry, as they demonstrate superior performance over AC microgrids with respect to reliability, efficiency, simplicity of control, and integration of renewable energy sources and DC loads. Despite its numerous advantages, it is still challenging to implement a protection system appropriate for DC microgrids. Apart the extraordinarily rapid increase of the fault currents, the absence of zero crossing of the current on a DC system constitute an important obstacle to the adoption of DC microgrids. In this work, different state-of-theart protection methods are addressed and analysed, and a simple protection system is developed.
The exponential development of power electronic devices has a significant impact on the development of direct current (DC) power distribution systems, as DC microgrids can promote a more efficient integration of distributed microgeneration systems. DC microgrids have attracted significant attention in both academia and industry, as they demonstrate superior performance over AC microgrids with respect to reliability, efficiency, simplicity of control, and integration of renewable energy sources and DC loads. Despite its numerous advantages, it is still challenging to implement a protection system appropriate for DC microgrids. Apart the extraordinarily rapid increase of the fault currents, the absence of zero crossing of the current on a DC system constitute an important obstacle to the adoption of DC microgrids. In this work, different state-of-theart protection methods are addressed and analysed, and a simple protection system is developed.
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Keywords
Disjuntores Híbridos Micro-Rede Dc Proteção Dc