Faculty of Engineering

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Browsing by Author "Abdelrahem, M."

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    Model-predictive control of multilevel inverters: challenges, recent advances, and trends
    (IEEE, 2023-09) Harbi, I.; Rodriguez, J.; Liegmann, E.; Makhamreh, Hamza; Heldwein, M. L.; Novak, M.; Rossi, M.; Abdelrahem, M.; Trabelsi, M.; Ahmed, M.; Karamanakos, P.; Xu, S.; Electrical & Electronics Engineering; MAKHAMREH, Hamza Ahmed Mousa
    Model-predictive control (MPC) has emerged as a promising control method in power electronics, particularly for multiobjective control problems such as multilevel inverter (MLI) applications. Over the past two decades, improving the performance of MPC and tackling its technical challenges, such as computational load, modeling accuracy, cost function design, and weighting factor selection, have attracted great interest in power electronics. This article aims to discuss the current state of MPC strategies for MLI applications, describing the significance of each challenge with the reported effective solutions. Through this review, the MPC methods are categorized into two groups: direct MPC (without modulator) and indirect MPC (with modulator). The recent advances of each category are presented and analyzed, focusing on direct MPC as the most applied method for MLI topologies. In addition, some of the important concepts are experimentally validated through a case study and compared under the same operating conditions to evaluate the performance and highlight their features. Finally, the future trends of MPC for MLI applications are discussed based on the current state and reported developments.
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    Multi-objective control of nine-level anpc converters: a robust and gain-free mpc method
    (IEEE, 2023) Harbi, İ.; Makhamreh, Hamza; Ahmed, Mostafa; Abdelrahem, M.; Heldwein, M.; Rodriguez, J.; Kennel, R.; Electrical & Electronics Engineering; MAKHAMREH, Hamza Ahmed Mousa
    Model predictive control (MPC) is a powerful control method for addressing multi-objective control problems, however, one of its main challenges is the cumbersome tuning process of the weighting factors. This paper presents a weighting factorless advanced MPC method for a recently developed nine-level active neutral point clamped (ANPC) converter, which has several advantages over conventional and recent nine-level topologies, such as low number of used switches and flying capacitors (FCs), reduced voltage rating of FCs and high efficiency. The developed MPC method avoids the use of weighting factors while addressing three control objectives: current control, FCs balancing and neutral point (NP) control. Similar to conventional finite-set MPC (FS-MPC), the presented method has high performance in terms of all control objectives. Moreover, this method exhibits enhanced robustness to parameter mismatch compared to the conventional scheme. The effectiveness of this method is validated through experimental testing under various operating conditions. The research demonstrates the potential for this technique to address control problems in ANPC-based converters and highlights its potential for further applications.