Experimental Evaluation of the Robust Controllers Applied on a Single Inductor Multiple Output DC-DC Buck Converter to Minimize Cross Regulation Considering Parametric Uncertainties and CPL Power Variations

Alvaro Christian Montaño Saavedra (), Walter Barra Junior, Renan Landau Paiva de Medeiros, Carlos Roozembergh Junior and Alan Sovano Gomes
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Alvaro Christian Montaño Saavedra: Institute of Technology, Electrical Engineering Faculty, Federal University of Pará, Belém 66075-110, PA, Brazil
Walter Barra Junior: Institute of Technology, Electrical Engineering Faculty, Federal University of Pará, Belém 66075-110, PA, Brazil
Renan Landau Paiva de Medeiros: Department of Electricity, Federal University of Amazonas, Manaus 69080-900, AM, Brazil
Carlos Roozembergh Junior: Institute of Technology, Electrical Engineering Faculty, Federal University of Pará, Belém 66075-110, PA, Brazil
Alan Sovano Gomes: Institute of Technology, Electrical Engineering Faculty, Federal University of Pará, Belém 66075-110, PA, Brazil

Energies, 2024, vol. 17, issue 14, 1-20

Abstract: This paper presents two control design strategies for voltage regulation in a single inductor dual-output DC-DC buck converter system. Based on a nominal multiple input multiple output plant model and performance requirements, both a Linear Quadratic Regulator and a Decoupled PI control law are designed to control the power converter system under parametric uncertainties such as voltage source variation, constant power load variation, and load resistance variation. Therefore, the converter can cascade operation, which may cause the undesired effects of voltage oscillation and reduce the system’s stability margin. The control performance was assessed under both the uncertainties of resistive loading and the power variation in a constant power load. A single inductor dual-output DC-DC buck converter board was developed for experimental tests. The experimental results show that the Linear Quadratic Regulator strategy, compared to the PI strategy, presented a robust performance in the presence of parametric uncertainties in the resistive load-bearing; however, it was sensitive to uncertainties due to the presence of constant power loads.

Keywords: single inductor dual-output DC-DC converter; parametric uncertainties; constant power load (CPL); linear quadratic regulator (LQR); integral square error; integral square control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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