Origem do Problema de Estabilidade de Conversores CC-CC Conectados em Cascata
DOI:
https://doi.org/10.18618/REP.2020.3.0024Keywords:
Cascata, Estabilidade, Middlebrok, Nyquist, Sistema de Geração Distribuída, Teorema do Elemento ExtraAbstract
O presente trabalho objetivou apresentar uma metodologia de associação de métodos de análise da estabilidade para aplicação em conversores CC-CC interconectados, validada por um estudo de caso. A combinação dos critérios de Middlebrook e Nyquist para a análise da estabilidade possibilitou detectar o surgimento de dinâmicas não-modeladas em função do acoplamento dos subsistemas que puderam ser identificadas por meio do Teorema do Elemento Extra (TEE). Além disso, foi demonstrado como a variação paramétrica afetou a estabilidade do sistema interconectado, apontando para a relevância que os valores de carga e os parâmetros do filtro de entrada têm nesta condição. Por fim, resultados experimentais foram obtidos de maneira a validar as análises supracitadas. Conclui-se que a associação de métodos de análise da estabilidade de sistemas em cascata foi essencial para identificar mais precisamente a origem do problema de estabilidade. Além disso, entendeu-se que as dinâmicas não-modeladas precisam ser consideradas na lei de controle empregada nos subsistemas para garantir a estabilidade do sistema interconectado por completo.
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