Publishing Date: setembro 2020 Editor-in-Chief: Demercil de Souza Oliveira Júnior
Editor Affiliation: UFC
ORIGEM DO PROBLEMA DE ESTABILIDADE DE CONVERSORES CC-CC CONECTADOS EM CASCATARodrigo P. França, Fabrício Hoff Dupont, José Renes Pinheiro
293-304
Palavras Chaves: estabilidade
Resumo
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.
Title: ORIGIN OF THE STABILITY PROBLEM OF DC-DC CONVERTERS CASCADE CONNECTED
Keywords: stability
Abstract
This study presented a case study-validated methodology of stability analysis with the association of two methods for the application in interconnected DC-DC converters. The combination of the Middlebrook and Nyquist criteria for the stability analysis made it possible to detect non-modeled dynamics when subsystems were coupled, which were identified through the Extra Element Theorem (TEE). In addition, it was demonstrated how the parametric variation affected the stability of the interconnected system, emphasizing the influence that the load values and the parameters of the input filter exercises on this condition. Finally, experimental results were obtained in order to validate the aforementioned analyzes. As a conclusion, the association of Middlebrook and Nyquist stability analysis methods was essential to identify more precisely the origin of the stability problem in the cascade system. In addition, it was understood that the control solution employed in the subsystems must consider the non-modeled dynamics to guarantee the stability of the hole interconnected system.
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