Detecção de harmônicas pares e componentes CC em redes elétricas trifásicas visando a redução do tempo de convergência na sincronização pela Generalização de Cancelamento por Sinal Atrasado (GDSC-PLL)
Keywords:
GDSC-PLL, PLL trifásico, detecção de harmônico, sincronizaçãoAbstract
Para conectar conversores elétricos à rede de distribuição, por exemplo, é necessário conhecer a magnitude e o ângulo de fase da componente harmônica fundamental de sequência positiva (Fundamental-Frequency Positive-Sequence - FFPS) do vetor tensão da rede elétrica. Geralmente, é aplicado um método de sincronização trifásico para obter esses dados e algumas métricas de desempenho são comumente utilizadas para comparar os métodos de sincronização, sendo o tempo de convergência crítico para muitas aplicações. O método baseado na generalização de cancelamento por sinal atrasado (Generalized Delayed Signal Cancellation - GDSC), aplicado como pré-filtro em um PLL trifásico (GDSC-PLL), apresenta um bom desempenho em geral.
Este artigo expõe que o tempo de convergência do GDSC-PLL pode ser reduzido pela metade quando os sinais de entrada não contêm harmônicas pares nem componente CC, assim como apresenta e analisa alternativas para detectar a presença de harmônicas pares e componente CC na rede elétrica trifásica.
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