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All Journal International Journal of Power Electronics and Drive Systems (IJPEDS)
Ibtissam Lachkar
University Hassan II
Control & Systems Engineering Electrical & Electronics Engineering

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Nonlinear control of grid-connected wind energy conversion system without mechanical variables measurements Karim Noussi; Abdelmajid Abouloifa; Hanane Katir; Ibtissam Lachkar; Fouad Giri
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 12, No 2: June 2021
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijpeds.v12.i2.pp1139-1149

Abstract

This article addresses the problem of controlling an overall wind energy conversion system (WECS) formed by a wind turbine connected to the grid via a doubly fed introduction generator (DFIG) and an AC/DC/AC converter. The main control objectives are fourfold: (i) designing an output feedback speed controller that makes the DFIG rotate at the optimal value delivered by the MPPT strategy, (ii) controlling the stator reactive power so as to be null, (iii) guaranteeing the DC-link voltage in the grid side converter to be at a given constant value, (iv) ensuring a unitary power factor. A high gain observer is synthesized, in order to provide estimated values of the mechanical variables. To achieve the control objectives, a sliding mode controller involving the mechanical observer is designed. The performance of the system configuration based on the 2MW-DFIG with the proposed controller is evaluated by a numerical simulation under a realistic wind profile using MATLAB/SIMULINK/SimPowerSystems environment.
Lyapunov controller design for a fuel cell electric vehicle powered by a three-level floating capacitor boost converter Chaouqi Aouadi; Abdelmajid Abouloifa; Meriem Aourir; Ibtissam Lachkar
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 17, No 3: September 2026
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijpeds.v17.i3.pp1620-1629

Abstract

Electric vehicles (EVs) have undergone considerable progress facilitated by the adoption of contemporary technologies, such as innovative energy sources like the fuel cell (FC) in conjunction with novel power converter architectures. In this context, this work addresses the problem of controlling a three-level flying capacitor boost converter (FCBC) powered by a fuel cell. The converter is linked at its output to an impedance modelling the DC/AC converter and a brushless motor integrated into an FC-EV. Variations in load demand and power provided by the fuel cell are an issue to be considered, alongside voltage balancing, which involves maintaining balanced voltages between flying capacitors, as an imbalance can lead to uneven component voltage and reduced converter efficiency. To solve these issues, a nonlinear controller is developed making use of the Lyapunov approach which ensures the proper operation of the system by continuously adjusting control actions based on the system dynamics. Indeed, the regulator comprises three loops: one dedicated to balancing the voltage across the flying capacitor, and two nested loops; The inner loop controls the inductor current, while the outer loop regulates the output voltage.
Co-Authors Abdelmajid Abouloifa Chaouqi Aouadi Fouad Giri Hanane Katir Karim Noussi Meriem Aourir