Browsing by Author "Ouadi, Abderrahmane (Supervisor)"

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Automatic Voltage Regulator for Synchronous Generator
(2018) Sari, Khalil-Errahmane; Haddadi, Aimen; Ouadi, Abderrahmane (Supervisor)
Automatic Voltage Regulator (AVR) is necessary for all power stations producing electricity using synchronous generators (SGs) to ensure constant voltage for the grid connection. This final year report aims to design and implement an AVR based PIcharacteristics using Programmable Logic Controller (PLC) for the laboratory 1.5kVA salient pole Lab-volt SG. Primarily, a mathematical model for the SG is developed. Open circuit, short circuit and three-phase sudden short-circuit tests were realized for several tries in order to accurately identify the different parameters (Xd, X’d, X”d, Xq, T’d and T” , etc.) of the SG. Secondly, static self-excitation system is used where a part of the generated voltage is fedback to the exciter via a semi-controlled rectifier consisting of thyristors and diods. The PLC outputs a control signal to the implemented ramp-comparator strategy firing circuit in order to generate firing pulses to the thyristors. Particle Swarm Optimization (PSO) technique is developed in Matlab to tune the PI-gains. dLastly, the functionality of the AVR is tested for three different cases where small- and high-valued loads are connected at the SG terminals. The complete system response is shown in terms of voltage and current. Results are discussed validating the use of the AVR implemented.
PID controlller tuning using DE and PSO optimization techniques
(2016) Alem, Mohamed Mounir; Saidoun, Hakim; Ouadi, Abderrahmane (Supervisor)
The PID controllers are the most popular and widely used controllers in industry because of their simplicity; robustness and successful practical application that can provide excellent control performance despite the varied dynamic characteristics of plant .Determination or tuning of the PID parameters continues to be important as these parameters have a great influence on the stability and performance of the control system. Most of the processes are complex and nonlinear in nature resulting into their poor performance when controlled by traditional methods. The need for improved performance of the process has led to the development of optimal controllers. In this project, two modern heuristic techniques which are particle swarm optimization (PSO) and Differential evolution algorithm (DE) are used for tuning and optimizing PID parameters. A classical method, which is Ziegler and Nichols method, is also used. Finally, a comparison is made between classical method (ZN) and optimization methods (PSO and DE) are applied on high order system, the proposed methods were indeed more efficient and robust in improving the control performances of the PID algorithm.
PLC and HMI based monitoring and control of an induction motor using VFD drive and profinet protocol
(Université M’Hamed Bougara de Boumerdes : Institut de génie electrique et electronique (IGEE), 2024) Zerrouki, Abderrezak; Ouadi, Abderrahmane (Supervisor)
Various applications in industrial automation require accurate and effective motor speed control. This project addresses this need by developing a motor speed control system utilizing a variable frequency drive (VFD), programmable logic controller (PLC), and human-machine interface (HMI). To achieve variable speed control, the study examines the operating characteristics of AC motors and their fundamental concepts, as well as the way VFDs manipulate the provided AC power. It delves into the capabilities of PLCs, highlighting how they receive control signals and direct the VFD to perform the desired motor functions. The integration of an HMI offers a user-friendly interface for system monitoring, speed set point adjustments, and fault identification. Additionally, the project incorporates the PROFINET protocol to ensure efficient and reliable communication between the PLC, VFD, and HMI. The implementation includes detailed system design, programming, and configuration. Results demonstrate the effectiveness of the integrated system in achieving accurate and responsive motor speed control, underscoring the advantages of using VFD, PLC, HMI, and PROFINET technologies in industrial automation.
Virtual measurement system for AC machine using labview
(2016) Henniche, Feriel; Keddache, Nadia; Ouadi, Abderrahmane (Supervisor)
It is widely accepted that contemporary scientific experimentation on electrical machines requires extensive measurements and acquisition of various data. In this project the development of virtual measurements system based on labview software environment is described. This system is able to perform an essentially large number of simultaneous electrical and mechanical physical variables measurements of an AC induction machine. In the studied case only voltages, currents (of the three phase system ),speed and torque are measured and recorded in real time , while power, reactive power, apparent power,total harmonic distortion…etc are calculated according to the IEEE(Institute of Electrical and Electronic Engineering) std 1945-2000. A graphical user interface is created to allow an accurate measurements display and data recording using TDMS function (Writes data to binary measurement files (.tdm or .tdms)).