Power

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    Open-switch fauli tolerant direct torque contol for voltage source inverter fed inducion motor drive system
    (2022) Boubou, Fouad Eddine; Nedjai, Abd Elouahed; Ammar, Abdelkarim (Supervisor)
    In many applications, such as nuclear reactors, aerospace, military applications, and life-saving machines, power electronic systems are considered one of the most important components. In such applications, the system must be highly reliable. All members of the drives community and marketplace are interested in the reliability of adjustable speed result, parallel redundancy is frequently used in these systems, albeit at a high cost. The electrical machines are supplied by AC-to-AC converters with an intermediate DC-link in many industrial drive applications. Different types of failures may occur at different levels of the AC drive system, such as the input rectifier, power inverter stage, which is of our interest in this thesis, or control sub-system. This work focuses on fault tolerant induction motor drive control in the event of VSI open-switch/leg failure. This system detects and isolates the fault, and then ensures the system's operation under the new conditions. This was accomplished using two different solutions:The first one was the redundancy-leg topology, which maintains the same control drive (Direct Torque Control) using a six-switch three-phase inverter (SSTPI). The second is a new switching technique for Direct Torque Control (DTC). This system modifies the DTC switching table using available stator voltage vectors in two phase mode with Four Switch Three Phase Inverter (FSTPI) topology to track the stator flux reference and directly control the torque and maintain the performance of the induction motor as in the Six Switch Three Phase Inverter (SSTPI) mode.
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    Control of electric vehicle traction chain based on dual induction motor drine using nine-switch inverter
    (Université M’Hamed BOUGARA de Boumerdes : Institut de génie electrique et electronique (IGEE), 2022) Roubache, Karima; Bouarada, Meriem; Ammar, Abdelkarim (Supervisor)
    Several research works have been pushed by industry to develop electric vehicles. This study aims at optimizing the cost and energy of the electric powertrain that is based on two in- duction motors supplied by two independent inverters in the conventional case, but this solution is expensive in terms of size and number of power switches. Thanks to its special topology with reduced number of semiconductor switches, the nine switch inverter has been suggested as a substitution to two conventional two level inverters. On the other hand, thanks to the robustness of direct torque control scheme as compared to other vector control methods, (DTC) proves to be a well suited control scheme for electric vehicle applications. Nowadays, the brilliant tech- nology in automotive industry towards regenerative braking is improving, thus bidirectional DC-DC converters are used for capturing the kinetic energy of motor and charging the battery during regenerative mode. In this context, a control of an electric vehicle traction chain based on dual induction motor drive using nine switch inverter is investigated in this report, to study the independency con- trol of nine switch inverter powered motors. Furthermore, the effectiveness of the developed controllers in separating between the flu xan dtorqu econtro lhav ebee nchecked .Likewise ,the regenerative braking has been studied to promote the efficienc yan drealizatio no fenerg ysaving in the electric vehicles. Simulation of these techniques were then carried out using MATLAB/Simulink software and the obtained results analyzed and discussed to confir mth evalidit yo fth epropose dtechniques.
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    Electrical parameters evaluation of a 600W photovoltaic system installed in the IGEE-boumerdes university
    (2019) Mazighi, Brahim; Aoubid, Ibrahim; Medjoudj, R. ( supervisor)
    The aim of this project is an evaluation of the electrical parameters of a 600W photovoltaic system; the system consists of four PV modules installed in the yard of the Institute of Electrical and Electronics Engineering (Boumerdes) at a fixed altitude angle of 45. The MPPT charge controller manages the power flow from the PV modules and batteries to the inverter which supplies a small load. The values of current and voltage at the PV modules and battery stages are taken every five minutes from the morning to the evening, then the results are analyzed using Weibull++ Software to define the parameters of distribution that the data is following, then conclude the mean values of power. The power data are divided into intervals, then the probability of each interval is calculated. The resulting probabilities is used to predict the power generated by the system through that day.