Robust Control of a Zeta Converter: A Feedback Linearization Approach with Digital PWM Implementation

David Angulo-García, Fabiola Angulo () and Juan-Guillermo Muñoz
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David Angulo-García: Departamento de Matemáticas y Estadística, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Colombia—Sede Manizales, Campus La Nubia, Manizales 170003, Colombia
Fabiola Angulo: Departamento de Ingeniería Eléctrica, Electrónica y Computación, Facultad de Ingeniería y Arquitectura, Universidad Nacional de Colombia—Sede Manizales, Campus La Nubia, Manizales 170003, Colombia
Juan-Guillermo Muñoz: Departamento de Mecatrónica y Electromecánica, Facultad de Ingeniería, Instituto Tecnológico Metropolitano, Calle 54A # 30-01, Barrio Boston, Medellín 050013, Colombia

Energies, 2025, vol. 18, issue 8, 1-16

Abstract: This paper presents a robust control strategy for a synchronous Zeta converter using feedback linearization combined with a PI controller. The control design is based on a state-averaged model, but it is implemented and evaluated in a digitally switched system using PSIM simulations. To ensure consistency between the averaged and switched models, the duty cycle is computed at the beginning of each period, and a centered PWM scheme is applied. This study identifies critical factors that affect stability, including the sampling period and the PWM edge selection, both of which can destabilize the switched system even when the averaged model remains stable. This study analyzes the difference in stability ranges between the averaged and switched models under variations in load and reference voltage, revealing significant discrepancies between them. Results show that the proposed control achieves robust performance, low stabilization time, and good tracking behavior across a wide range of conditions.

Keywords: DC–DC Zeta converter; feedback linearization; centered PWM; sampling-induced stability; model-dependent stability (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: 2025
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