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All Journal International Journal of Electrical and Computer Engineering
Carlos Andrés Ramos-Paja
Universidad Nacional de Colombia
Computer Science & IT Electrical & Electronics Engineering

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Sliding-mode controller for a photovoltaic system based on a Cuk converter Carlos Andrés Ramos-Paja; Daniel Gonzalez-Motoya; Juan Pablo Villegas-Seballos; Sergio Ignacio Serna-Garces; Roberto Giral
International Journal of Electrical and Computer Engineering (IJECE) Vol 11, No 3: June 2021
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijece.v11i3.pp2027-2044

Abstract

The wide range of step-up and step-down input-output voltage characteristic of the Cuk converter makes it a good candidate to interface photovoltaic arrays in both classical and distributed maximum power point tracking systems. Because its two inductor structure, Cuk converters have continuous input and output currents, which reduce the additional filtering elements usually required for interfacing dc/dc converter topologies. However, PV systems based on Cuk converters usually do not provide formal proofs of global stability under realistic conditions, which makes impossible to ensure a safe operation of the PV installation. Therefore, this paper proposes a high performance sliding-mode controller for PV systems based on Cuk converters, which regulates the PV voltage in agreement with the commands imposed by a MPPT algorithm, rejecting both load and environmental perturbations, and ensuring global stability for real operation conditions. Finally, the performance of the regulated PV system is tested using both simulations and experiments.
Sliding-mode controller for a step up-down battery charger with a single current sensor Juan Pablo Villegas Ceballos; Carlos Andres Ramos-Paja; Elkin Edilberto Henao-Bravo
International Journal of Electrical and Computer Engineering (IJECE) Vol 12, No 2: April 2022
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijece.v12i2.pp1251-1264

Abstract

This paper proposes a battery charger solution based on the Zeta DC/DC converter to provide a general interface between batteries and microgrid direct current (DC) buses. This solution enables to interface batteries and DC buses with voltage conversion ratios lower, equal, and higher than one using the same components and without redesigning the control system, thus ensuring global stability. The converter controller is designed to require only the measurement of a single inductor current, instead of both inductors currents, without reducing the system flexibility and stability. The controller stability is demonstrated using the sliding-mode theory, and a design procedure for the parameters is developed to ensure a desired bus performance. Finally, simulations and experiments validate the performance of the proposed solution under realistic operation conditions.
Co-Authors Daniel Gonzalez-Motoya Elkin Edilberto Henao-Bravo Juan Pablo Villegas Ceballos Juan Pablo Villegas-Seballos Roberto Giral Sergio Ignacio Serna-Garces