Title: Nonlinear interconnected high gain observer for series-parallel resonant DC/DC converter

Authors: Ouadia Elmaguiri; Abdelmajid Farchi; Abdellah Boulal; Aziz Akhiate

Addresses: Laboratory of Engineering, Industrial Management and Innovation, Faculty of the Sciences and Technology of Settat, Morocco, 26000, Morocco ' Laboratory of Engineering, Industrial Management and Innovation, Faculty of the Sciences and Technology of Settat, Morocco, 26000, Morocco ' Laboratory of Engineering, Industrial Management and Innovation, Faculty of the Sciences and Technology of Settat, Morocco, 26000, Morocco ' National School of Arts and Metiers, Hassan II University, Casablanca, 20000, Morocco

Abstract: We are considering the problem of state observation in series-parallel resonant converters (LCC). This is a crucial issue in (LCC) output voltage control as the control model is nonlinear and involves non-physical state variables, namely real and imaginary parts of complex electrical variables. An interconnected high gain observer is designed to get online estimates of these states. The observer is shown to be globally asymptotically stable. The global stability of the observer is analytically treated using the Lyapunov theory; finally we present numerical simulation to illustrate the performance of the suggested approach.

Keywords: series-parallel resonant converter; DC/DC converter; averaging approximation; first harmonic approximation; state variables observation; Lyapunov theory; interconnected observer; high gain observer; stability; exponential convergence.

DOI: 10.1504/IJMIC.2019.104380

International Journal of Modelling, Identification and Control, 2019 Vol.33 No.2, pp.159 - 168

Received: 04 Jan 2019
Accepted: 18 Sep 2019
Published online: 06 Jan 2020 *

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