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Iury Bessa
Programa de Pós-graduação em Engenharia Elétrica, Universidade Federal de Minas Gerais, Belo Horizonte; Departamento de Eletricidade, Universidade Federal do Amazonas, Manaus
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Pedro H. S. Coutinho
Programa de Pós-graduação em Engenharia Elétrica, Universidade Federal de Minas Gerais, Belo Horizonte
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Isaías V. de Bessa
Departamento de Eletricidade, Universidade Federal do Amazonas, Manaus
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Renan L. P. Medeiros
Departamento de Eletricidade, Universidade Federal do Amazonas, Manaus
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Reinaldo M. Palhares
Departamento de Engenharia Eletrônica, Universidade Federal de Minas Gerais, Belo Horizonte
Keywords:
DC-DC converters, Constant Power Load, Virtual stabilizer, Linear matrix inequalities, Takagi-Sugeno fuzzy models
Abstract
This work proposes a new method to use virtual reconfigurable stabilizers for stabilization and oscillation damping in DC-DC converters with constant power loads. This concept, inspired by reconfiguration blocks for fault hiding, is used in this paper for dealing with negative impedance effects while maintaining the operation with a controller previously designed. Thus, design conditions based on linear matrix inequalities are presented to obtain the parameters of the stabilizer for guaranteeing the exponential stability of the converter’s operation point. Numerical simulations indicate that the stabilizer is able to improve the system’s damping and to guarantee the stability in scenarios where the nominal controller is unable to stabilize it.
