Proposta de uma Nova Estratégia Ativa de Anti-Ilhamento Baseada em Realimentação Positiva de Frequência
DOI:
https://doi.org/10.18618/REP.2021.3.0007Keywords:
Anti-ilhamento, Desvio de Frequência, Sistemas fotovoltaicos conectados à rede de CA, Zona de não detecçãoAbstract
O fenômeno do ilhamento ocorre quando um Sistema de Geração distribuída permanece energizado após a interrupção da rede da concessionária. A ocorrência de ilhamento não intencional pode acarretar em diversos problemas relacionados à segurança dos usuários e operadores do sistema elétrico e perda da qualidade de energia elétrica. Nesse contexto, o presente trabalho apresenta um novo método ativo de Proteção Anti-Ilhamento (PAI) com realimentação positiva de frequência. Para atestar a efetividade da estratégia, será realizado um estudo comparativo entre o algoritmo proposto e outras técnicas conhecidas na literatura: Active Frequency Drift (AFD), Sandia Frequency Shift (SFS) e uma variante do AFD proposta em 2013. Os ensaios experimentais serão realizados empregando um inversor CC-CA de 1 kW, a rede da concessionária e uma carga RLC, projetada segundo as recomendações da norma ABNT NBR 62116. Os resultados obtidos comprovarão que a técnica proposta apresenta uma redução da Zona de Não de Detecção, do tempo de detecção do ilhamento e do conteúdo harmônico inserido na corrente de saída do inversor.
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