Institut de Génie Electrique et d'Electronique
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Item Control of three-phase inverter grid-connected solar system(Université M’Hamed Bougara de Boumerdes : Institut de génie electrique et electronique (IGEE), 2024) Hambli, Soumeya; Metidji, Brahim (Supervisor)Grid-connected solar photovoltaic (PV) systems are rapidly increasing each year due to a growing global interest in renewable energy and rising energy demand. This project focuses on designing and modeling a grid-connected PV system using space vector pulse width modulation (SVPWM). It also reviews key aspects and literature related to the components of a PV system, the inverter, and the grid connection. The photovoltaic model is employed to replicate the characteristics of a real PV array, while a Perturb and Observe method for maximum power point tracking (MPPT) is introduced to optimize the DC-DC boost converter’s performance. In this project, a three-phase two-level voltage source inverter (VSI) is employed, controlled using two approaches: a synchronous reference frame with a proportional-integral (PI) controller and a stationary reference frame with a proportional resonant (PR) controller with space vector pulse width modulation (SVPWM). The control strategy includes a phase-locked loop (PLL) to acquire important data about the grid voltage. To connect the inverter output to the grid, an LCL filter is used to reduce total harmonic distortion (THD) in both the output current and voltage. The system model is created using the MATLAB/SIMULINK environment.Item Implementation of a 5 level modular multivel converter(Université M’Hamed Bougara de Boumerdes : Institut de génie electrique et electronique (IGEE), 2024) Khaldi, Yahia; Metidji, Brahim (Supervisor)This Master 2 project explores the design and implementation of a modular multilevel converter (MMC),focusing on both theoretical and practical aspects. The theoretical component delves into the fundamentals of multilevel converters, detailing various modulation techniques employed to enhance performance and efficiency. Specifically, it examines the advantages and challenges of using these techniques in multilevel converters. The practical segment involves the simulation of a 5-level inverter using MATLAB Simulink, aimed at evaluating its performance under different conditions. Key meth- ods include the application of advanced pulse width modulation (PWM) techniques to minimize harmonic distortion and improve voltage output quality. The simulation results demonstrate a significant reduction in total harmonic distortion (THD) and efficient power conversion. Following the simulation, the project transitions to the real-world implementation of the 5-level inverter with actual components. This phase involves constructing the inverter, integrating control strategies, and testing the system’s performance. The findings reveal that the implemented inverter closely aligns with the simulated results, confirming the viability of the design for practical applications.Item Hardware-in-the-loop simulation of bidirectional AC/DC converter connected to DTC-SVM for enhanced control of PMSM(2023) Bendada, Abderrahmane; Zekouki, Tahar Islam; Metidji, Brahim (Supervisor)This thesis explores the application of hardware-in-the-loop (HIL) simulation to enhance the control of Permanent Magnet Synchronous Machines (PMSMs) by integrating a bidirectional AC/DC converter with a Direct Torque Control-Space Vector Modulation (DTC-SVM) scheme. The bidirectional converter enables energy transfer between the PMSM and the power grid during both inverter mode and rectifier mode. The DTC-SVM algorithm provides precise torque and flux control with reduced ripple. The proposed HIL setup combines a real-time digital simulator with a physical PMSM and bidirectional converter, allowing for comprehensive testing and validation of the control system. The experiments conducted demonstrate the effectiveness of the integrated system in achieving enhanced control of PMSMs and offer insights into parameter optimization and system performance under various operating conditions. The findings contribute to the advancement of PMSM control techniques and the development of HIL simulation methodologies for power electronic systems, promoting improved performance and reliability in industrial applications.Item SCADA system for power system laboratory(2022) Lalmi, Ahmed; Metidji, Brahim (Supervisor)The present report shows the design and implementation of a SCADA system for power system laboratory enabled to acquire data from various power electronics modules connected into the same local area network. The main focus was to develop a reliable SCADA software that is able to monitor and analyze the electrical fow within the building to provide a more in-depth analysis of the electrical network. The software uses the famous ModbusTCP communication protocol to poll metric data from digital power analyzer units used in the laboratory, it is possible to display all measured values and operating states inside the system in real time on the existing measuring instruments, or even select, record and export the results to CSV or Excel ?les. The presented application is written in python3 programming language, and it uses Qt for the GUI and other libraries to manage communications and databases.Item Development of a 2D ultrasound anemometer using HC-SR04(2021) Dif, Nour Elyakine; Metidji, Brahim (Supervisor)Measurement of wind speed using an anemometer is very important in various fields. The most effective and efficient type of anemometer is the ultrasonic anemometer. This project describes the design and implementation of an ultrasonic anemometer, usually called ‘sonic’ anemometer, where wind speed is measured based on ultrasound sensors. The digital controller is implemented around the STM32F103C8T6 microcontroller using hardware design approach and a C++ language software with a primary objective of minimizing the noise and obtaining the most precised results. The 2D Ultrasonic Anemometer consists of four bi-directional ultrasonic transducers HC-SR04, in pairs of two which are opposite each other at a certain distance, and a display unit LCD-16x2, to display the wind speed. The advantage of ultrasonic anemometer is not having analogue signal conditioning and analogue filters, thereby reducing the possibility of having noise, low cost, and can be monitored remotely. The respective measurement paths and their direction values are selected via electronic control which is in our case an STM32. When a sensor starts, a sequence of four individual measurements in all four directions along the paths is carried out at maximum speed. The measurement directions (acoustic propagation directions) rotate clockwise, south to north, west to east, north to south and east to west. The overall digital controller is downloaded onto the STM32 development board. To test the feasibility and functionality of the system, a wind blow is needed.Item Reduced number of switch direct torque control of induction machine with bidirectional capability(2020) Aissou, Ghilas; Sklab, Lainser; Metidji, Brahim (Supervisor)In the middle of 1980s a novel technic for alternating current (AC) machine control is proposed, this technic is known as direct torque control (DTC). It happens that the control algorithm of this technic is simple and less sensitive to machine parameters compared to others technics. It is based on direct determination of suitable switching states according to the error of the torque and flux. However, since the switching frequency of basic DTC is not constant then high torque and flux ripples are produced which in turns degrade the performance of this technic, especially at low speed regions. This work introduces and compare between DTC or induction motor (IM) using six switch three phase inverter (SSTPI) and DTC for IM using four switch three phase inverter (FSTPI). The basic FSTPI results in four unbalanced voltage vectors, which in turns divide the ?? plane into four sectors. These unbalanced voltage vectors generated by the FSTPI leads to high torque and flux ripples, in order to improve these performances, effective vectors are introduced; this strategy is based on the emulation of the operation of the conventional SSTPI. This has been achieved by suitable combination of the four unbalanced voltage vectors. This approach allows using the well-known established switching table of SSTPI for FSTPI. The simulation results comparaison of the proposed FTSTPI fed IM drive with the conventional SSTPI system shows that the proposed technic is quite acceptable considering its performance such as fast speed response, cost reduction and other advantages features.Item Direct torque control with space vector modulation of inverter fed permanent magnet synchronous motor(2018) Maddi, Liza; Rezki, Amazigh; Metidji, Brahim (Supervisor)In recent years, synchronous motors have become widely used in industrial applications. In all low speed ratings, synchronous motors are physically smaller and less costly to build than squirrel-cage induction motors of equivalent horsepower. Moreover, synchronous motors provide higher torque/inertia ratio and higher efficiency. Particularly, Permanent Magnet Synchronous Motors (PMSM) do not have windings on the rotor. So, there is no need for brushes and slip rings what leads to less copper losses, less maintenance and space saving. This thesis presents the Direct Torque Control Space Vector Modulation (DTC-SVM) of PMSM. The implementation requires a Digital Signal Processor (DSP) to handle the issue of the control of the PMSM. The DTC-SVM is one of the preferred methods for motor drives since it operates at a constant switching frequency. This method is based on the estimation of the motor torque and stator flux, comparing the signal with the two adjustable references and compensate the error signals using a PI controller. The simulation of DTC-SVM model is done using MATLAB/Simulink®. The results are presented to help analyze the system response. The modeling could also be done using fuzzy logic techniques for better results.Item Design and implementation of an overcurrent digital relay(2018) Medjber, Brahim; Benmouffok, Youcef; Metidji, Brahim (Supervisor)A model based design approach has been applied in this thesis for the development of an overcurrent protection relay, having both the instantaneous characteristics and the inverse time current characteristics as per IEEE standard C-37.112-1996. (ANSI 50, 51). This approach highly accelerates and simplifies the design. MATLAB Simulink has been used for the development of the model and Simulink HDL coder has been used to generate the VHDL code. The code generation is supported by keeping certain constraints like fixed point data type in the design during system development. This generated code is used for verification and implementation of the designed model. The digital simulation of the generated codes and test bench has been performed on ModelSim Digital Simulator. In this work, a hardware platform for power line communications was implemented to be used with the relay and give it a communicative functionality. This allows the relay to coordinate its decisions with its adjacent peers enhancing its selectivity.Item Design and implementation of direct torque control of induction motor drive(2018) Rouidjali, Imene; Rezki, Abdelaziz; Metidji, Brahim (Supervisor)The direct torque control was proposed as an alternative strategy to the field-oriented control for AC machines drive. This method consists on the direct determination of inverter switching states and offers a simpler and robust scheme and less sensitivity to machine parameters as it depends only on the stator resistance. In this work, the direct torque is presented for induction motor drive fed by two-level voltage source inverter. The control algorithm has been investigated through simulation and experimental tests. The simulation part was carried out using MATLAB/Simulink software, the obtained results shows the effectiveness of this method. Moreover, the generic model of a direct torque control for induction machines is implemented using DSP TMS 320f28027f in order to test and validate the presented control algorithm.Item Variable frequency drive (VFD)(2019) Ghazi, Abdenour Adel; Hamaili, Lyazid; Metidji, Brahim (Supervisor)A variable frequency drive (VFD) is a type of motor controller that drives an electric motor by varying the frequency and voltage supplied to the electric motor. Other names of a VFD are variable speed drive, adjustable speed drive, adjustable frequency drive, AC drive, Mi-crodrive, and inverter. One of the most recent variable frequency drive control methods is the Vector control also known as Field oriented control, which can be implemented through direct or indirect approaches. Indirect rotor field-oriented control (IRFOC) is a very popular technique in industries due to its simple designing and structure, in compar-ison to the direct method since it requires flux and torque estimators. In this proposed project IRFOC is simulated using MATLAB/Simulink and an implementation is carried out.