Power

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    Integration of DGA Interpretation Methods in Matlab GUI for Enhanced Power Transformer Fault Diagnostics
    (2024) MECHEREF, Rania; BOUCHAHDANE, Mohamed (supervisor)
    Power transformers are essential components in electrical power systems, responsible for the efficie nttransmission and distribution of electricity. Ensuring the irreliability is critical for maintaining uninterrupted power supply and overall system stability. One of the most effective techniques for monitoring transformer health is Dissolved Gas Analysis (DGA), which detects early signs of faults such as overheating, partial discharges, and arcing by analyzing gases dissolved in transformer oil. Interpreting DGA results, however, can be complex and requires significan texpertise .Traditional methods, including the Key Gas Method, Doernenburg Ratio Method, Rogers Ratio Method, IEC Ratio Analysis, and Duval Triangle Method, each have their own strengths and limitations, making manual application time-consuming and prone to errors. This thesis addresses these challenges by developing a MATLAB-based Graphical User Interface (GUI) that integrates multiple DGA interpretation methods. The primary goal is to create a user-friendly tool that automates the analysis process, making it more accessible to maintenance personnel and improving diagnostic accuracy. By applying this tool to real-world transformer data, the thesis demonstrates its effectiveness in identifying and diagnosing faults ,there by enhancing the reliability of transformer maintenance practices.
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    Control and simulation of an electric vehicle's traction chain based on interior permanent magnet synchronous motor IPMS
    (2021) Mokrani, Asma; Oussad, Linda; Ammar, Abdelkarim (Supervisor)
    In this work, the concepts of electric vehicles EVs and their traction system is introduced. First by looking to their history, types and different motors used for EVs. Then to go deeply in EV's powertrain, a system main component's modelling (motor, inverter, battery) must be done, where the IPMSM which is the most used motor in EVs applications was chosen. For the inverter , pulse width modulation PWM was first modelled and simulated then because of harmonics problems it was replaced by SVPWM. In a complete agreement the Lithium-ion batteries are the EVs most used battery and this because of their small size, besides many other advantages. Now the next step is to control the modelled traction system for this purpose Indirect Field Oriented control IFOC method was used and since in every control technique there is always a primary control objective combined with a secondary combine objective, the main purpose was to control the angular speed of the motor, then the second objective set is to regulate the flow of current hence, MTPA was integrated to the control system. In order to implement a more robust , nonlinear and chattering free control method , IFOC was replace by a Super Twisting Sliding Mode Control STSMC . As a final improvement to the system a DC-DC converter was added
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    Protective relaying system for education
    (2018) Adrouche, Adel; Bentarzi, Hamid( Supervisor)
    A rapidly growing in power industry requires more reliable operation of power supply that increases complexity of power systems. For attaining this aim new communication solutions and an increased focus on protection may be needed. The power engineering department at IGEE has proposed advanced power systems initiatives to better prepare its students for the power industry field. One of these initiatives is the development of a new laboratory curriculum that uses digital relays to reinforce the fundamental concepts of power system protection. The simple relay protection lab planned at IGEE should include a test bench with distance, over-current and differential relays, and a relay tester that may be used for applying simulated waveforms to the relays. This project proposes a laboratory protection system fulfilling this task. It presents background on power system protection, modern relay technology, and relay testing, to support the design and practical setup of the protective relaying system. The report includes a theoretical part describing the components of power system protection, their function, and attributes in order to understand better the importance of power system protection. Three chapters covering the principles of protective relaying functions relevant to the lab are included. They cover the theory of overcurrent, differential and distance protection.Modeling and simulation can help students to better understand how a relay reacts during a fault or other non-fault disturbances. New design models of overcurrent and differential relay have been implemented in PC using power system simulator PSCAD. Proposals of lab assignments that can be performed in the protective relaying laboratory are presented at the end, using the designed models and the protective equipment available at the institute and donated for the purpose of this work.
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    Design and implementation of industrial uninterruptible power supply
    (2018) Midoun, Mohammed Laid; Boudraa, Abdelouahab; Metidji, Brahim ( Supervisor)
    Providing a steady flow of power is important for mission-critical electrical loads. Slight variations in the voltage may cause these loads to fail in a way that back-up generators cannot quickly respond to. Uninterruptible power supply (UPS) systems provide a nearly instantaneous solution to these power quality problems. Designing and implementing a UPS system was the main objective of this project. Many modern UPS systems are power electronics systems composed of an online double-conversion rectifier-inverter, a battery management system, and a set of bypass systems. For this project, a Vienna rectifier and three level inverter double-conversion topology was selected for its simplicity and high efficiency. The design topology was implemented using Matlab/Simulink software in order to demonstrate a proof of concept for the UPS system. As an extension of this project, additional work was done in an attempt to physically realize the system. Prototype hardware and software were developed and tested.
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    Low harmonic distortion and high efficiency power factor correction based on boost converter
    (2019) Smaini, Mohamed Anis; Recioui, A. (Supervisor)
    The increasing growth in the use of electronic equipments such as PC, laptops, portable electrical products and battery chargers which need AC-DC converters to provide power in recent years has resulted in a greater need to ensure that the line current harmonic content of any equipment connected to the ac mains is limited to meet regulatory legislation and recommended practices for power quality assurance (e.g., IEC 61000-3-2). This requirement is usually satisfied by incorporating some form of Power Factor Correction (PFC). In this project, an Active Power Factor Correction (PFC) circuit based on boost converter with its control system will be introduced, which is a relatively simple and low- cost circuit. The design and simulation of boost converter with Average Current Mode control in Continuous Conduction Mode (CCM) will be presented in order to achieve a high switching frequency and power factor, with a low total harmonic distortion and high efficiency.