Browsing by Author "Aibeche, Abderrezak"

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A randomized carrier-based discontinuous pulse width modulation strategy for neutral point clamped three-level inverter
(Publishing House of the Romanian Academy, 2024) Boudouda, Aimad; Aibeche, Abderrezak; Bouzida, Ahcene; Boudjerda, Nasserdine
This article introduces a novel approach called randomized carrier-based discontinuous pulse width modulation (RCDPWM) to address the challenge of mitigating both low-order and high-order harmonics concentrated at the switching frequency and its integer multiples in the output voltage and current of a three-level inverter. The proposed strategy reduces switching losses and a wide dispersion of voltage and current harmonics with significantly smaller amplitudes by integrating features from discontinuous and randomized PWM methods. This characteristic proves beneficial for enhancing efficiency and electromagnetic compatibility. The RCDPWM strategy involves three schemes: two simple schemes (one random parameter), randomized pulse position modulation (RPP-DPWM) and randomized carrier frequency modulation (RCF-DPWM), and a dual scheme combining the two previous ones (RPPRCF-DPWM). Power spectral density (PSD) is used to assess the effectiveness of the proposed strategy in quantitatively analyzing the harmonic dispersion degree. The results demonstrate that the proposed RCDPWM strategy significantly expands harmonic clusters around the switching frequency, reducing its intensity. The spectrum analysis revealed that the RPPRCF-DPWM scheme is the most effective in spreading the output voltage and current spectrum compared to simple schemes (RPP-DPWM and RCF-DPWM).
Real-Time Reduction of rotor position estimation error based on the stator flux Estimation-Combined method for sensorless control of PMSMs drives
(Praise Worthy Prize S.r.l, 2021) Aibeche, Abderrezak; Akroum, Hamza; Boudouda, Aimad; Kidouche, Madjid; Doghmane, Mohamed Zinelabidine
This paper presents the implantation and the performance improvement of real-time reduction of rotor position estimation error based on the stator flux estimation-combined method for sensorless control of PMSMs drives. Wherein, the proposed method is designed based on a simple algorithm for accurate estimation and robust control of quasi-exact stator flux and position/speed of PMSMs. A large-speed range of applications in sensorless control strategies is achieved by using the mathematical model of PMSM motor. The latter presents the main idea of the estimators’ structures design. They are generally composed of voltage and current models (VM and CM). However, the dynamic performances of these methods are influenced in the low and high-speed ranges, and they are sensitive to parameters variations. The estimators’ structures are dominated by the current model at the low-speed range, and by the voltage model at the high-speed range. The technique proposed in this study is the combination of the two preceding models; this provides performances’ improvement in the PMSM dynamics for a large speed variation with compensating estimation errors for the two separate methods (VM and CM). The main objective of this combined method is the drawback reduction for the separate use of VM and CM estimators. The algorithm principle is based on exploiting and combining the two estimators while measuring the stator voltages and the currents, in addition to estimating the rotor position and the speed. Furthermore, the performances of the proposed method have been tested and validated through real-time experiments by using dSPACE ds 1104 DSP board
Stick-Slip Vibration Mitigation in Rotary Drilling Systems Using a Particle Swarm Optimization-based PID Controller under Varying Weight on Bit Conditions
(Budapest Tech Polytechnical Institution, 2025) Tellaa, Mawloud; Aibeche, Abderrezak; Doghmane, Zinelabidine Mohamed; Kidouche, Madjid
Rotary systems on drilling rigs are susceptible to various types of vibrations, which can lead to equipment damage, reduced borehole quality, decreased drilling efficiency, and increased non-productive time. These vibrations are typically managed through manual adjustments of drilling parameters, often resulting in higher costs and reduced productivity. To address this challenge, automatic control strategies have been developed, though the robustness of these controllers is still under refinement. Recently, a promising approach has emerged by combining PID controllers with Particle Swarm Optimization (PSO) algorithms, demonstrating significant success in other applications. However, its effectiveness in mitigating stick-slip vibrations, particularly under varying Weight on Bit (WOB) conditions, in rotary systems on drilling rigs has not been fully tested. This paper examines the application of a PSO-optimized PID controller to enhance the robustness of vibration mitigation strategies in rotary drilling systems, taking into account the effect of WOB. The results demonstrate that the proposed controller outperforms previously developed control approaches, offering superior vibration suppression even under varying WOB conditions