Contrôle

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    PID controller parameters tuning using metaheuristic methods for quadrotor UAV
    (2022) Abedelaziz, Mouloud Aghilas; Ammar, Abdelkarim (supervisor)
    Since quadrotors are gaining more popularity in research area, due to their control complexity and their highly complicated nature. Although there have been many techniques designed to control quadrotor systems, most of them are characterized with high computational burden. Therefore PID controllers are preferred for their simplicity and effective performance, however in order to achieve such level of efficiency their gains need to be tuned properly. In this work, three well-known metaheuristic algorithms are applied for that purpose, namely: PSO, TLBO, and WOA. The three optimizers were employed to extract the optimum PID gains for altitude, Roll, yaw and pitch angles. A comparative study on the basis of the Integral of Absolute Error, Settling time,Rise Time, and overshoot was conducted to examine the introduced approaches. In general the results have demonstrated the superior performance of the PSO algorithm over its counterparts in most the investigated aspects.
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    Voltage oriented and model predictive control of three-phase vienna rectifier.
    (2021) Terkmane, Oussama; Zidane, Djamel Eddine; Ammar, Abdelkarim (supervisor)
    Generally, the conversion from AC to DC uses conventional uncontrollable or controllable diodes rectifier in both single phase and three phases. The main drawbacks of these rectifiers are injecting a huge amount of distortion in the AC-side line currents, low power factor and high ripple factor in the output DC- side. Recently, new types of controllable AC to DC converters such as PWM rectifier and Vienna rectifier which improve the quality of AC- line current with a low harmonics distortion, high power factor that is almost unity and a straight output DC- current which reduce ripple factor. This thesis is interested in comparison study between PWM rectifier and Vienna rectifier. Both structures and principle of work of these rectifiers are presented and what are factors that control them. It also covers the SVM (space vector modulation) and how this technique is different from a rectifier to another. Finally, the performance of PWM and Vienna rectifiers are evaluated under several control strategies such voltage oriented control (VOC) and model predictive control- finite control set (MPC-FCS) that reduce the complexity of previous control strategy. The performances are tested under different conditions balanced, unbalanced and distorted network. All covered techniques are simulated using MATLAB/Simulink software.