Power
Permanent URI for this collectionhttps://dspace.univ-boumerdes.dz/handle/123456789/3079
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Item Fault tolerant control of a five-phase permanent magnet synchronous machine using fuzzy logic approach(Université M’Hamed BOUGARA de Boumerdes : Institut de génie electrique et electronique (IGEE), 2023) Bellakhal, Mohamed; Hamza, Tarek; Ammar, Abdelkarim (Supervisor)The core contribution of this work lies in the exploration of fault tolerant control strategies for multiphase VFDs. The thesis presents a detailed analysis of various fault types that can occur in synchronous motors, emphasizing the need for effective fault detection and tolerance mechanisms. It introduces passive fault tolerant control, with an emphasis on fuzzy algorithms. Furthermore, this research investigates the application of direct torque control (DTC) and DTC with space vector pulse width modulation (DTC-SPWM) strategies for fault detection and tolerance in multiphase VFDs. The performance of these strategies is evaluated through simulation studies, considering different operating conditions such as motor speeds and load torques. The results highlight the robustness and effectiveness of the proposed fault detection algorithms, showcasing improved performance in terms of speed and torque tracking. Based on the findings ,th ethesi ssuggest sfutur eresearc hdirections .Thes einclude the hardware implementation of the fault detection methods with DTC and DTC-SPWM strategies, the extension of fault detection capabilities to detect multiple open switch and open phase faults, and the implementation of active fault tolerance mechanisms using space vector modulation.Item Current sensor fault tolerant control of permanent magnet syschronous machine(2021) Haouas, Abderaouf; Ghoumrassi, Mohamed Amine; Ammar, Abdelkarim (Supervisor)To ensure the safety operation and service continuity of control systems, a control technique appeared called Fault-Tolerant Control (FTC). It enables the detection and isolation of faults, as well as the reconfiguration of the control system, to ensure continuity of service and to protect the healthy components from the effects of failing elements. Certainly, several works have been carried out on this subject in different fields of application, among them: the current sensors faults presented in the AC electric drives based on motors like Permanent Magnet Synchronous Motors (PMSMs). These kind of motors are widely used in the industry for variable speed applications due to their high performance reliability and power density. However, in order to achieve fault-tolerant control of current sensors faults , it is necessary to ensure the correct compromise between the detection of faulty sensors and the reconstruction of the currents. In this context, many methods have been proposed for the detection or estimation of three-phase stator currents. Apart from fault detection, current estimation is frequently based either on several cascaded observers, a current sensor and a voltage sensor in the converter DC bus, or an observer and a healthy line current sensor. In this work, the estimation of three-phase stator currents is approached by proposing a method based only on a single current observer, which ensures the estimation and correction of the three stator currents even in case of failure of all current sensors (Current sensorless). This method was then combined with a conventional fault detection and isolation circuit (FDI) and field oriented control (FOC), where the assembly is an active fault-tolerant control for current sensors. Another fault tolerant control method against current sensor faults based on a speed robust controller is named passive fault tolerant control (PFTC). Both methods proposed in this work were applied on an SPMSM. Promising results were obtained in simulation on Matlab/Simulink.