ROBUST CONTROL FOR DC-DC BUCK CONVERTER UNDER PARAMETRIC UNCERTAINTIES
Kevin Eduardo Lucas Marcillo1; Erick Melo Rocha1; Walter Barra Junior1; David Alejandro Vaca Benavides2; Renan Landau Paiva de Medeiros3; Maysa Sousa Alves1; Maickson Patrick Viana Leão1
1 Universidade Federal do Pará; 2 Escuela Superior Politécnica del Litoral; 3 Universidade Federal do Amazonas
Baixar PDF doi:10.20906/CPS/CBA2018-1472
Resumo
DC-DC Buck Converters are widely used in applications demanding the supply of a constant load voltage. However, the dynamic behavior of the buck converter may change due to uncertainties such as load and input voltage variations, as well as variations in the components of the buck converter itself. Because of these variations and the nonlinear be-havior due to switching, makes the controller design presents some challenges on obtain the desired performance. In order to guarantee stability of the system and to preserve its dynamic performance under parametric uncertainties, in this paper a robust control technique, based on parametric uncertainties, is studied. The controller is designed by ro-bust pole-placement technique based on a desired performance in closed-loop, specified by a family of characteristic polynomials. The design procedure is formulated as a set of linear constraints solved via linear programming methods. A classical controller, based on pole-placement technique, is used for performance comparison. For performance as-sessment, several tests were carried out in Matlab/Simulink environment. By calculating the ISE (integral square error) performance index, the obtained results show that the proposed controller obtain robust performance.
Palavras-chave: buck converter; dc-dc converter; robust control; parametric uncertain; linear programing