Browsing by Author "Dekhandji, Fatma Zohra"

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    Design and simulation of low distortion current mode control power factor correction converter
    (IEEE, 2020) Bouaraki, Mouloud; Dekhandji, Fatma Zohra; Recioui, Abdelmadjid
    The spread of switched-mode power supplies for DC appliances to fulfill effectiveness and performance goals has been met with the growth of industry legislation and recommended practices for power quality assurance (e.g., IEC 61000-3-2). The generation of harmonic content induced by non-linear loads is an undesirable side effect to the conversion of electrical energy in the network which in turn lowers the power factor leading to greater power consumption and losses throughout the grid. 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
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    Design optimization of PMU Anti-Aliasing filters using taguchi method
    (2020) Dekhandji, Fatma Zohra
    A Phasor Measurement Unit (PMU) is a monitoring device, which serves in checking the power system condition by measuring voltage and current phasors along with frequency at a particular node. The basic structure of PMU consists of Synchronization Unit, Measurement Unit and Data Transmission Unit. The Measurement Unit has three components: Anti-aliasing filters, Analog-to-Digital Converter and Phasor measurement Unit/ Processor. An anti-aliasing filter ensures that all the analog signals have the same phase shift and attenuation thus assuring that the phase angle differences and relative magnitudes of the different signals are unchanged. Anti-aliasing filters made up of an analog front end and a digital decimation filter are far more stable as far as aging and temperature variations are concerned. IEEE C37.118 standard stipulates that it is mandatory to use the filter for avoiding any aliasing errors. Out of various analog filters, the Butterworth has been preferred due to its flat response in pass-band as compared to other filters. In this work, it is attempted to design anti-aliasing filters to be used in PMUs. The design problem is formulated as an optimization task that is solved using the Taguchi method. The results show better performance in terms characteristics compared to the conventional filters. The designed filters may be employed as building blocks in modern PMUs
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    Detection and mitigation of power quality problems based on phasor measurment units and renewable energy systems
    (2016) Dekhandji, Fatma Zohra
    Power quality problems constitute a headache for power systems engineers. The detection and mitigation of these problems increases the reliability and availability of the system. Phasor measurement units are devices introduced to assess the health of the power system. Furthermore, renewable energies turn out to be not only sources of energy but can be used as medicines to the power quality problems as well. In this work, phasor measurement units are employed to monitor the power system and renewable energy systems are used to mitigate the power quality problems occuring in the grid. A controller must detect, classify and issue a control signal to the renewable energy system to compensate and/or attenuate any deviation in the system performance as compared to the healthy situation
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    Detection of power quality disturbances using discrete wavelet transform
    (IEEE, 2017) Dekhandji, Fatma Zohra
    With the growing use of sensitive and susceptive electronic and computing equipment, power quality is foreseen to cause a great concern to electric utilities. The best analysis on power quality is vital to provide better service to customers. Disturbances in power system usually produce continuity changes in the power signal. Wavelet transform is particularly useful in detecting discontinuities in signals, and this makes it appropriate for detection of disturbances in power quality. Wavelet transform is proposed to detect and identify the power quality disturbance at its instance of occurrence. Power quality disturbances are sag, swell, interruption, transient and harmonic. This study reviews various kinds of power quality disturbances with the goal of detecting them using wavelet transform. The results show clearly various forms of changes in amplitude and frequency of the signals. The application shows that this method is fast, sensitive, and practical for detection and identification of power quality disturbance
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    Effects of voltage disturbances on induction motors and adjustable speed drives
    (IEEE, 2015) Dekhandji, Fatma Zohra; Bentarzi, Hamid; Recioui, Abdelmadjid
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    Hydrogen-based hybrid renewable energy system sizing optimization using HOMER
    (IEEE, 2022) Recioui, Abdelmadjid; Dekhandji, Fatma Zohra
    Conventional power systems are mostly based on fossil fuels. These constitute a substantial source of pollution in addition to being quickly depleted. Isolated areas and communities cannot profit from this type of electric energy for the reason that they are far from the grid. The hybrid renewable energy systems (HRES) have demonstrated to be an excellent solution for such a situation. The purpose of this paper is to design and optimize a standalone hybrid energy system to satisfy the electricity demand for a remote drilling site in Adrar province located in the South of Algeria. To cure the problem of intermittence of the solar and wind sources, a hydrogen-based set up is appended to the hybrid renewable energy system. The simulations are done using HOMER software to determine the optimal the HRES configurations considering techno-economic criteria
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    Joint economic and emission load dispatch for the Algerian grid via an improved harmony search algorithm
    (Springer, 2023) Bouaraki, Mouloud; Dekhandji, Fatma Zohra; Recioui, Abdelmadjid; Benmissoum, Abdellah; Khellas, Oussama
    Renewable energy sources (RES) have been very popular as they reduce the release of damaging toxins to the air contrary to fossil fuel combustion. The economic load dispatch (ELD) issue looks for the optimal dimensioning of the RES to lessen the fuel cost while Emission Dispatch (ED) is concerned with the best dimensioning of the RESs to decrease the quantity of the produced pollutants. A multi-purpose Joint Economic-Emission Dispatch (JEED) seeks the best RES dimensioning by compromising the fuel fee and toxin release simultaneously. In this paper, a JEED problem is solved for a ten-unit Algerian Network using a recent optimization algorithm named Improved Harmony Search Algorithm (IHSA). The obtained results suggest that the considered JEED problem proves to be more practical than when ELD and ED are dealt with separately. Also, an enhancement in terms of economic and emission dispatch is obtained for the considered case. This work also witnesses on the superiority of the IHSA over state of art approaches
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    Load Balancing in Smart Grids using Multi- Objective Evolutionary Optimization
    (Université M'hamed Bougara de Boumerdès, 2021) Bouaraki, Mouloud; Dekhandji, Fatma Zohra; Abdi, Lina Amel; Recioui, AEM
    The work deals with the balance between the supplied and consumed power in a residential area. An optimization task is formulated and solved. The extension of the optimization task formulation to include renewable sources is also provided. It is shown in the results that using the deployed optimization technique, a significant reduction in the energy usage cost and the waiting time of the appliances (delay) for residential consumers can be achieved. This work can be used in smart home and smart cities applications.
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    The National Conference on Computational Engineering, Artificial Intelligence and Smart Systems- NCCEAISS’2024 December 10th to 12th, 2024, Tamanrasset, Algeria : Book of abstracts
    (2024) Recioui, Abdelmadjid; Dekhandji, Fatma Zohra; Bentarzi, Hamid; Benazzouz, Djamel; Grouni, Said; Yakhelef, Yassine
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    New approach of induction motor performance study under different voltage unbalance conditions
    (2006) Bentarzi, Hamid; Refoufi, L.; Dekhandji, Fatma Zohra
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    Opportunities of Power Quality Enhancement in Smart Grids with Electric Vehicles
    (Institute of Electrical and Electronics Engineers Inc, 2023) Dekhandji, Fatma Zohra; Recioui, Abdelmadjid
    Environmental concerns have pushed for the replacement of current gasoline- and diesel-powered cars with zero-emission electric vehicles (EVs). As a result of this substitution, more EVs connect to the power grid. As a consequence of such cars, some problems with energy quality arose. This paper examines the issues that electric vehicles pose to power systems. Using an approach termed Vehicle-to-Grid, EVs may serve as both a load and an energy source. This method brings significant characteristics to a microgrid, such as primary frequency regulation. In this paper, a technique known as Decentralized Vehicle-to-Grid Control for Primary Frequency Regulation taking into account Charging Needs is investigated and demonstrated in MATLAB SIMULINK for various scenarios in order to analyze the affect of these EVs on the frequency of the microgrid.
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    Optimal placement of DGs in the distribution networks using an analytical approach
    (IEEE, 2022) Dekhandji, Fatma Zohra; Baali, Habiba; Recioui, Abdelmadjid
    The work deals with the penetration of Distributed Generators (DGs) units into a simple radial system. An analytical optimization method is used to determine the optimal locations and sizes of the DGs minimizing the power distribution loss. A load flow method called Backward/Forward is used. In addition, a method based on the calculation of Voltage Stability Index (VSI) is employed to ensure the stability of the system after the placement of DG units
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    Performance of induction motor under the effect of voltage unbalance with loading consideration
    (Springer, 2015) Dekhandji, Fatma Zohra; Refoufi, Larbi
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    Quantitative assessment of three phase supply voltage unbalance effects on induction motors
    (Springer, 2015) Dekhandji, Fatma Zohra; Refoufi, Larbi; Bentarzi, Hamid
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    Signal processing deployment in power quality disturbance detection and classification
    (2017) Dekhandji, Fatma Zohra
    Power quality disturbances have adverse impacts on the electric power supply as well as on the customer equipment. Therefore, the detection and classification of such problems is necessary. In this paper, a fast detection algorithm for power quality disturbances is presented. The proposed method is a hybrid of two algorithms, abc–0dq transformation and 90 phase shift algorithms. The proposed algorithm is fast and reliable in detecting most voltage disturbances in power systems such as voltage sags, voltage swells, voltage unbalance, interrupts, harmonics, etc. The three-phase utility voltages are sensed separately by each of the algorithms. These algorithms are combined to explore their individual strengths for a better performance. When a disturbance occurs, both algorithms work together to recognize this distortion. This control method can be used for critical loads protection in case of utility voltage distortion. Simulation and analysis results obtained in this study illustrate high performance of the strategy in different single-phase and three-phase voltage distortions
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    Simulation and Optimization of a Microgrid Energy Management System
    (Institute of Electrical and Electronics Engineers Inc, 2023) Dassa, Khaled; Recioui, Abdelmadjid; Dekhandji, Fatma Zohra
    This paper deals with the deployment and integration of renewable energies and storage systems. An Energy management system is necessary to achieve this objective. Two energy management techniques are considered in this work. They are termed: 'heuristic' and 'optimization' methods. Both methods aim to reduce the overall reliance on the conventional energy source from the main grid by maximizing the output of the two other sources (solar energy and storage system) and thus, reducing the overall cost. This study contrasts the two methods in terms of both grid usage and cost. Simulations considering cloudy and clear sky conditions while ensuring the user's satisfaction are carried out.
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    Study of the effects of unbalanced sinusoidal voltage supply on induction motor steady state performance
    (2006) Dekhandji, Fatma Zohra
    Le présent travail concerne une étude théorique détaillée sur les effets des tensions d'alimentation non équilibrées sur le fonctionnement en régime permanent des moteurs asynchrones pour différents niveaux de puissance, alimentés directement à partir d’un système sinusoïdal triphasé; ce qui représente une situation prépondérante dans notre pays, les convertisseurs électroniques de puissance installés étant encore en nombre limité. Le déséquilibre de tension est calculé sur la base des deux définitions les plus connues, définition NEMA et définition IEC. Les effets du déséquilibre de tension sur les paramètres des moteurs asynchrone en régime permanent: le couple, les courants statorique et rotorique ainsi que les pertes additionnelles de cuivre sont calculés et étudiés. La corrélation entre un déséquilibre de valeur donnée et les effets néfastes qui en découlent sur la machine a été établie. L'effet principal se manifeste par des pertes additionnelles dans des proportions substantielles causant une grande élévation de température nécessitant par conséquent le déclassement de la machine d'un pourcentage donné. Selon l'étude, le déclassement nécessaire dépend aussi de la puissance assignée nominale de la machine. Par ailleurs, l’alimentation en monophasé, suite à une perte d'une phase d'alimentation triphasée, représentant un cas extrême de déséquilibre de tension a été étudiée. L'étude montre que la perte d’une phase peut avoir des effets très graves sur la machine en termes de contrainte thermique excessive, occasionnant des pertes et des températures d’enroulement très élevées exigeant donc le débranchement immédiat de la machine, afin de la protéger contre tout endommagement permanent
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    Voltage unbalance effects on induction motor performance
    (2006) Refoufi, Larbi; Bentarzi, Hamid; Dekhandji, Fatma Zohra
    The reliability of electric drives and driven motors depends on the quality of the power supply voltage especially in the critical industrial process. In this work, a theoretical study of the effects of voltage unbalances, sags and swells on induction motor (IM) is performed by using the conventional method based on the theory of symmetrical components. For this study, MATLAB software program is developed for calculating currents, torque, power losses, temperature rises and derating factor. Besides, experiments have been carried out for obtaining currents, torque and power losses. An agreement that is found between the theoretical predictions and experimental data allows us to take into consideration the predicted derating factor