Revista Eletrônica de Potência (Brazilian Journal of Power Electronics)

Palavras Chaves: Anti-ilhamento, Desvio de Frequência, Sistemas fotovoltaicos conectados à rede de CA, Zona de não detecção

Resumo
– 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.

Title: PROPOSAL OF A NEW ACTIVE ANTI-ISLANDING STRATEGY BASED ON POSITIVE FREQUENCY FEEDBACK.

Keywords: Anti-islanding, Frequency drift, Grid-Tie PV, Non-detection zone

Abstract
The islanding phenomenon occurs when a distributed generation system remains energized after the utility grid interruption. The occurrence of unintentional islanding can lead to several problems related to the safety of users and operators of the electrical system and loss of power quality. In this context, this work presents a new active method of Anti-Islanding Protection (AIP) with positive frequency feedback. In order to attest the strategy’s effectiveness, will be performed a comparative analysis between the proposed algorithm and other techniques known in the literature: Active Frequency Drift (AFD), Sandia Frequency Shift (SFS) and a variant of AFD proposed in 2013. Experimental tests will be carried out employing a 1 kW DC-AC inverter, the utility grid and an RLC load, designed according to the ABNT NBR 62116 recommendations. The results obtained will prove that the proposed technique presents a reduction of the Non-Detection Zone, the time of islanding detection and harmonic content of the inverter current.

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