Conversor CC-CC Isolado de Três Portas com Controle Robusto LQG/LTR Aplicado em Sistemas Fotovoltaicos com Armazenamento de Energia

• Ano de defesa: 2021
• Autor(a) principal: Damasceno, Debora Pereira
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Conversor CC-CC; Conversor de três portas; Realimentação de estados; Controle multivariável centralizado; LQG; Sistema MIMO
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/59674

This work proposes to use a centralized multivariable control strategy for an isolated three-port DC-DC converter that will figurate as the integrator element between a photovoltaic system, a battery bank and a 96 W DC bus. The converter is represented by a multivariable state space model with 3 MOSFET switches as the control inputs; the output voltage as the controlled output and the photovoltaic panel and battery voltages as external disturbances. The control strategy is formulated using the LQG (Linear Quadratic Gaussian) approach with the Loop Transfer Recovery (LTR) to guarantee stability to a state feedback controller with integral action. The contributions of the work are: (i) the application, in power electronics, of a robust centralized control structure for state feedback, (ii) consideration of the input disturbances in the photovoltaic system and energy storage system and (iii) use of the state estimator for state feedback regarding the magnetizing current. Finally, simulation and experimental results are presented and discussed to validate the performance of the proposed approach.