Exact Feedback Linearization Control of Three-Level Boost Converters

M. G. JUDEWICZ; SERGIO ALEJANDRO GONZÁLEZ; E. GELOS; J. R. FISCHER; D.O. CARRICA

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

Lugar: New York; Año: 2022 vol. 70 p. 1916 - 1926

0278-0046

Three-level boost DC-DC converters (3LBC) present several advantages in comparison with conventional boost converters such as reduced switching losses, lower voltage ratings for the diodes and switches, and smaller size of reactive components. The topology requires three voltage levels at the output, therefore replacing the output capacitor of the traditional boost converter with two capacitors and a midpoint. However, due to component tolerances and/or current flowing through the midpoint, output capacitors voltages become unbalanced, leading to converter malfunctioning or destruction. To overcome this issue, an exact feedback linearization (EFL) control strategy is proposed, for which an implementation with minimum sensors is obtained. Analyses of its performance at different input voltages and ofits robustness against component variations are included. Simulation results are provided showing a comparison of the proposal with a conventional control strategy and its steady state performance with non-linear loads. The proposed control strategy was implemented in a low-cost microcontroller unit (MCU) and experimental verification is included.