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

Author

Listed:
  • 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)

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.

Suggested Citation

  • David Angulo-García & Fabiola Angulo & Juan-Guillermo Muñoz, 2025. "Robust Control of a Zeta Converter: A Feedback Linearization Approach with Digital PWM Implementation," Energies, MDPI, vol. 18(8), pages 1-16, April.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:8:p:1927-:d:1631752
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