http://depot.umc.edu.dz/handle/123456789/6016 2026-05-02T20:29:09Z http://depot.umc.edu.dz/handle/123456789/14832 Contrôle et continuité de fonctionnement du moteur asynchrone à l’aide de la carte DSPACE 1104. Bouabid, Nourelhouda; Khezzar, Abdelmalek This work provides a new diagnosis method for broken bar and mixed air gap eccentricity faults in the closed loop control of a squirrel cage induction motor. The closed loop system is widely used in industrial applications due to the efficiency of the variables of the regulator outputs for diagnosis because it directly shows the action of the control. The regulator will continue to force the controlled variables to the reference value, resulting in a decrease in the magnitude of the diagnostic indicators and a loss of information critical for detecting faults that cause a motor disaster. This work Based on the direct stator current fault signature as well as the speed fault signature to return the real magnitude of the fault diagnosis indices without affecting the indirect field control. Furthermore, the real magnitude is used to compensate for the fault magnitude and to obtain a machine operating in a healthy state. Using the discrete Fourier transformation. The transfer function is utilized to find the analytical expression of the measured electrical and mechanical parameters at both conditions. The fault signature and error of the torque are used to compensate for the fault signature speed, torque, and quadrature stator current. The simulation and experiment results are included to verify the effectiveness of the theoretical analysis. 2023-11-29T00:00:00Z http://depot.umc.edu.dz/handle/123456789/14821 Modélisation et simulation d’une chaine de conversion photovoltaïque. Bouderres, Nacer; Kerdoun, Djallel; Djellad, Abdelhak The integration of photovoltaic (PV) systems into the electrical grid faces numerous technical challenges, including the reliable and efficient export of energy to the grid while ensuring energy quality requirements. In this context, the objective of this work is to significantly contribute to the improvement and optimization of a PV system connected to a distribution grid. To achieve this, MPPT (Maximum Power Point Tracking) algorithms are applied to optimize the energy production at the source. Subsequently, a VOC (Voltage Oriented Control) is implemented on the DC/AC converter using PSO optimization technique for both classical PI and FOPI regulators, ensuring a better connection to the grid. Mathematical models of the system components have been developed and validated through simulation using MATLAB/Simulink. According to the obtained simulation results, it has been observed that the VOC control strategy using the PSO-FOPI regulator meets the performance criteria in terms of rapidity, stability and precision with an optimized total harmonic distortion (THD) rate. These results demonstrate the efficiency and reliability of the proposed system. 2023-10-12T00:00:00Z http://depot.umc.edu.dz/handle/123456789/14816 Contribution à la commande des machines électriques Oualah, Oussama; Kerdoun, Djallel The objective of this thesis is to optimize the design of a wind energy conversion system by establishing an optimal balance between cost, energy efficiency, system performance, and the quality of energy injected into the electrical grid. To achieve this objective, we conducted modeling, control, and simulation of a wind generator consisting of a wind turbine, a brushless doubly fed reluctance machine BDFRM, back-to-back converters, and a control block.The control block is divided into two parts: generator-side converter control and gridside converter control. Modeling of various control-related elements, such as the DC bus and the GSC-grid link filter, was performed. The primary stator of the machine, operating as a generator, is directly connected to the electrical grid, while the secondary stator is connected via back-to-back converters, enabling control of the entire wind system. Techniques such as stator flux orientation, first and second-order sliding mode control, and Maximum Power Point Tracking (MPPT) control were applied to the control block to independently control the active and reactive powers sent to the electrical grid by the generator and extract maximum power.Simulation results of the overall wind system demonstrate the effectiveness of the MPPT control. They confirm that independent control of the active and reactive powers sent to the electrical grid by the wind generator has been successfully achieved using stator flux orientation. The nonlinear control methods examined in this study have demonstrated high performance in managing the wind energy conversion system. Simulation results have confirmed the efficiency and robustness of each method in terms of tracking, unity power factor operation, decoupling, response time, and current quality. 2023-09-27T00:00:00Z http://depot.umc.edu.dz/handle/123456789/14723 Techniques de la commande RST et de la commande prédictive appliquées a une génératrice asynchrone autoexcitée (GAAE) pour des sites éoliens isoles. Abdessemad, Oussama; Nemmour, Ahmed Lokmane Wind energy occupies a central place among all available renewable energies. Until now, the new technological solutions offered by wind generators are of considerable interest due to their production capacity, their operational stability as well as the possibility of their integration into already existing distribution networks. In this thesis, we presented the experimental validation of the control of a chain for converting wind energy into electrical energy using a Self-Excited Asynchronous Generator (GAEE) equipped with a static converter associated with a DC bus. The electrical energy generated will be intended primarily to supply an isolated site with direct current at a constant voltage, taking into account simultaneous variations in power consumed and wind speed. For this, we worked on the implementation of a new version of vector control with a minimal control structure comprising a single regulation loop, which is derived from indirect vector control called simplified vector control. To make this possible, we introduced a change of variable defined by the ratio between the square of the voltage across the capacitor and the angular speed of the rotor imposed by the wind turbine. The transfer function resulting from the proposed approach is a cascade of first order and pure integration. In order to meet the regulation requirements imposed by this dynamic, our choice was based on two types of regulators whose synthesis is part of linear automation; the first resembles in its dynamics a PI type regulator, while the second constitutes a corrector or a phase advance compensator. Tests by numerical simulation and experimental validation have just supported the validity of the proposed contribution. In order to improve the qualities of this control, we realized that the structure of the developed command is perfectly suited to the use of advanced digital commands and particularly the RST controller as well as the MPC controller. 2024-12-12T00:00:00Z