Souad Chebbi

hight school of sciences and technics · electrical engineering

This study delves into addressing the challenge of resolving the Unit Commitment (UC) problem, which focuses on enhancing the efficiency of production units and devising their operational schedules to accommodate fluctuations in consumption spanning from a day to a month. Given the intricate, combinatorial, and nonlinear constraints associated with...

This paper presents the design procedure of a high-performance sensorless control strategy for the widely used brushless DC (BLDC) motors. Generally, conventional sensorless techniques are based on detecting the zero-crossing instants (ZCP) of the back electromotives forces (back-EMFs) of the three phases. These methods, although widely adopted and...

This paper addresses the problem of estimating the time series of a gene expression using nonlinear Bayesian filtering algorithms. The response of gene regulatory networks (GRNs) to functional requirements in the cell and environmental conditions evolves over time. Dynamic biological processes such as cancer progression and treatment recovery depen...

Solving the Unit Commitment problem (UCP) optimizes the combination of production units operations and determines the appropriate operational scheduling of production units to satisfy the expected consumption which varies from one day to one month. This paper represents a new strategy combining three optimization methods: Tabu search, Particle swar...

Recently, the use of distributed power generation systems (DPGSs) based on renewable energy resources is increasingly being pursued as a supplement and a reliable alternative to the large traditional energy sources. For it, power-electronic interface technologies and control have also emerged as the most important key elements in the area of energy...

This paper proposes a method to control low frequency circulating currents generated in parallel interleaved converters. In this configuration, inverters are parallelized using magnetically linked inductors. Generally, to improve the harmonic content of the output voltage, carrier interleaving is used. This results in a higher circulating current (...

The occurrence of contingencies in the power system may cause deviation from its ideal operating condition, which initiates the security assessment for efficient operation of the power system. This paper has two objectives. First, to identify and classify the power system states that provides a consistent security analysis. Second, to evaluate each...

This paper presents a novel meta-heuristic approach based on the crow search algorithm (CSA) for solving the optimal reactive power dispatch (ORPD) problem. The ORPD is formulated as a nonlinear optimization problem designed to minimize power losses while satisfying the required constraints. The CSA is a recent efficient approach that depends on th...

This paper presents a comparative study between a new strategy based on hybrid Gradient-Genetic Algorithm method and metaheuristic methods for solving Unit Commitment problem. Strategies have been applied on the IEEE electrical network 14 bus test system for a variable load profile during a discretized margin of time (24-hour time requirement). The...

Solving the Unit Commitment problem (UCP) optimizes the combination of production units operations and determines the appropriate operational scheduling of each production units to satisfy the expected consumption which varies from one day to one month. Besides, each production unit is conducted to constraints that render this problem complex, comb...

The power of particle filters in tracking the state of non-linear and non-Gaussian systems stems not only from their simple numerical implementation but also from their optimality and convergence properties. In particle filtering, the posterior distribution of the state is approximated by a discrete mass of samples, called particles, that stochasti...

Unatoč brojnim prednostima, uz konvencionalni pristup direktnom upravljanju snage aktivnog energetskog filtra povezani su i određeni problemi. U ovom radu razmatra se sinteza novog pristupa upravljanju koji kombinira direktno upravljanje snagom i teoriju pasivnosti kako bi se osigurale kvazi-sinusoidalne struje mreže, u raznim uvjetima napona izvor...

We consider the dynamic EEG source localization problem with additional constraints on the expected value of the state. In dynamic EEG source localization, the brain sources, also called dipoles, are not stationary but vary over time. Moreover, given our specific EEG experiment, we expect the dipoles to be located within a certain area of the brain...

Despite its many advantages, the conventional direct power control (DPC) of shunt active power filters (SAPF) poses some problems. This paper investigates the design of a new control technical combining DPC control and passivity theory (PT) to ensure quasi-sinusoidal grid currents, under various conditions of the source voltages. The proposed appro...

This paper presents a new control strategy which is based on a switching table applied for Virtual Flux Direct Power Control (VF-DPC) of voltage source inverter based shunt active power filter (SAPF). This control method is applied to eliminate harmonic pollution and compensate the reactive power in the presence of nonlinear loads and unbalanced so...

The objective of this paper is to develop a new identification algorithm for the disturbance currents through the combination of a multi-variable filter (MVF) with the theory of instantaneous powers (PQ-MVF). The MVF exploits the transform of Concordia and ensures the selective or global extraction of harmonic current references. Consequently a shu...

The study done in this paper concerns the use of a new control technique of current using adaptive hysteresis regulator by fuzzy logic on the command of a parallel active filter. For the proposed method, the hysteresis band is adapted in every moment in order to determine the switching frequency and control the position of the command pulses. This...

This article presents a harmonic compensation system using a photovoltaic generator (GPV) to improve the supply power quality. The proposed configuration is constituted by a grid connected three-phase inverter, a PV array and a nonlinear load formed by a bridge rectifier feeding a resistive load in series with an inductor. An indirect current contr...

This issue (DOI: 10.13140/RG.2.1.3493.8325) includes the following articles; P1110702001 Lotfi KRICHEN Modeling and Control of a Hybrid Renewable Energy Production Unit P1110708002 Sbita Lassaâd and Ben Hamed Mouna An MRAS - Based Adaptative Full Order Luenberger Observer for Sensorless DRFOC of IM Drives - Performances and Stability analysis P1110...

In this paper, the use of a three‐level inverter as a shunt active power filter is carried out, taking advantage of the benefits of multi‐level inverter, namely, the reduction both in the overall switching losses and in total harmonic distortion. The main focus of this article is to investigate the potentialities of the inverter employed as shunt a...

The development of the industry and the gradual increase of the population are the main factors for which the consumption of electricity increases. In order to establish a good exploitation of the electrical grid, it is necessary to solve technical and economic problems. This can only be done through the resolution of unit commitment problem (UCP)....

The aim of this study is to identify early predictors of refractory epilepsy. From 600 epileptic children followed for at least 2 years in the department of neurology of Charles Nicolle hospital of Tunis, were identified children with refractory epilepsy. Controls were children who responded well to antiepileptic drugs and who were seizure free for...

This paper present a novel fault location algorithm for Extra High Voltage transmission lines based on unsynchronized data generated from two-end of the line. Only post-fault currents and voltages at both ends of the line are required to estimate the synchronization angle and the exact distance to fault. First, a mathematical development is present...

This study deals with a newly-conceived control strategy for three-phase grid connected VSIs used for distributed generation (DG) system with renewable energy sources. This strategy has been called SCCA (Symmetrical Component Control Algorithm). The SCCA aims that DG power plants can avoid overcurrent while helping to mitigate the adverse effects o...

This paper presents a new approach based on the combination of the Particle Swarm Optimization and the gradient method to solve the unit commitment (UC) problem. The proposed strategy optimizes the combination of production units operations and determines the appropriate operational scheduling of each production units to satisfy the expected consum...

Solving the Unit Commitment problem (UCP) optimizes the combination of production units operations and determines the appropriate operational scheduling of each production units to satisfy the expected consumption which varies from one day to one month. Besides, each production unit is conducted to constraints that render this problem complex, comb...

Due to different concerns, renewable energies stand out as an opportunity for a sustainable future. Wind/Photovoltaic Hybrid Systems are one important type of renewable energy power systems. In order to increase renewable energies integration rate, this chapter proposes a utility interactive grid-connected wind-PV hybrid system with storage batteri...

Fault location and distance protection in transmission lines are essential smart grid technologies ensuring reliability of the power system and achieve the continuity of service. The objective of this chapter is to presents an accurate algorithm for estimating fault location in Extra High Voltage (EHV) transmission lines using Artificial Neural Net...

Active filters are effective solutions to eliminating harmonic pollution and improving reactive power in the presence of nonlinear loads and unbalanced sources. To reduce the disturbances caused by this type of load, we propose, in this paper, a new control strategy of a shunt active filter. Our method aims to improve electrical quantity behavior i...

Active filters are effective for eliminating harmonic currents and compensating reactive power in the presence of non-linear loads and unbalanced sources. In this paper, a new strategy for control of shunt active filter is proposed. Fuzzy logic based switching state selection Direct Power Control (DPC) is employed for this control scheme. In additi...

This paper studies a new approach based on the artificial neural networks (ANN) for the fault detection and classification, in real time, in transmission lines to extra high voltage (EHV) which can be used in the production system digital protection. This approach is based on the treatment of each phase current and voltage. The outputs of the ANN i...

This paper presents the design of a photovoltaic conversion system conditioning with grid connection and RLC load. In order to control the quality and quantity of the injected power to the grid, the control system includes, firstly, a Maximum Power Point Tracker based on perturb and observe algorithm which tracks available power continuously. Furth...

This paper presents control strategies for the integration of a grid-connected wind-photovoltaic hybrid system via adaptation converters connected to a common DC bus. For both wind and solar system, adequate control algorithms have been implemented for the maximum power extraction. The grid side converter has been connected to the point of common c...

As a perspective to ensure the voltage and frequency electrical network stability, the load shedding constitutes a desirable action to maintain the network service quality and to control its vulnerability. In this paper, we propose a new intelligent load shedding strategy applying fuzzy control algorithms. This strategy is based on the estimate, in...

The excessive increase in the number of subscribers in the electrical grid requires a flexible control of this electrical network and a better reliability of the offered power quality. Thus, several defense plans are omnipresent to ensure stability, continuity of service and to overcome some disturbances which can affect the electrical grid. In thi...

This paper presents the control of induction machine connected to an electrical network via a cascaded two-stage conversion chain. The developed algorithm is successfully implanted on Field Programmable Gate Arrays (FPGA). This FPGA combined with fast digital analog converters provides measure calculation real-time. The experimental results are car...

We present, in this paper, the analytical development of a new load shedding strategy based on fuzzy regulators. The aim of this strategy is to ensure the voltage and frequency stability of an electrical network. The strategy foundation is based on the sensitivity evaluation, in real time, of generated powers by alternators in relation to injected...

This paper proposes control strategies for a grid connected Hybrid System (WPVHS) composed of wind turbine photovoltaic array and storage system. The aim is to ensure the service continuity despite the fluctuating behavior of the renewable sources by using a batteries storage system. The proposed control scheme is based on the power balancing in th...

The aim of this paper is to develop and simulate supervisory algorithms for optimum operation of an integrated hybrid renewable energy system. The studied system is based on a DC-coupled Wind/Photovoltaic Hybrid System (WPVHS), equipped with battery storage system, which delivers on the power grid in presence of a conventional generator. The purpos...

Various plans of defense are omnipresent to guarantee stability, to ensure continuity service and to overcome such disturbances being able to affect the electrical network. In this context, our work is based on the implementation of a preventive strategy of defense based on the implementation of the Flexible AC Transmission Systems (FACTS) devices...

The electrical network stability and in particular the voltage one, facing to serious faults, represents one of the major preoccupations of electricity companies since these faults can destroy the voltage quality and even lead to a voltage collapse phenomenon. To avoid such phenomenon we proposed a curative defense method based on the load shedding...

The power electronic developments and it's integration in the electrical network has generally negative consequences. Indeed, in the presence of sinusoidal supply source and nonlinear load, static converters absorb non-sinusoidal currents, and consume reactive power. To limit the disturbances caused by these converters and to strengthen the system...

The capacity to maintain the electric network reliability by ensuring the good quality of the electric quantities to be deliver to users became one of the major challenges as well as for the energy producers and the consumers facing this challenge, several research in this field are started. Some works were directed towards the study of the voltage...

In this paper, we present the new preventive and curative strategy developments used to a power system stability control implemented in the network Test IEEE 14 buses. This development is in order to show that this type of control ensures maintenance of the network in a study state by using an adequate control taking into account of the studied net...

The electrical supply grids can be the seat of an unbalance of voltage system following the single-phase loads which are connected and which are not uniformly distributed on the three phases. We propose, in the present paper a new approach to control a power system based on a double fed induction generator (DFIG) connected to an electrical grid lik...

The electrical supply network is often the seat of incidents which cause disturbances. When such a defect occurs, there is birth of significant non symmetry of voltage which can endanger the safety of the people and the deterioration of the existing installations in the electrical supply networks, if it is not quickly eliminated. Voltages unbalance...

As a perspective to ensure the power system stability and to avoid the vulnerability leading to the blackouts, several preventive and curative means are adopted. In order to avoid the voltage collapse, load shedding schemes represent a suitable action to maintain the power system service quality and to control its vulnerability. In this paper, we t...

The loss of synchronism is the fact that a power station or a group of power stations functions during a few seconds at a frequency different from the other power stations inter-connected on the same network. This phenomenon occurs in several disturbed situations, like a short-circuit which causes violent disturbances, felt at least strongly by the...

The quality of the electric power produced, transported and distributed did not cease being a major concern for the operators and the manipulators of electricity. Several disturbances of various natures are at the origin of instabilities of the electrical supply networks. Among the disturbing phenomena, we quote the unbalance voltage of which we we...

The excessive increase in the price of the oil barrel following the economic and political situation brought the public authority to adopt a national strategy of energy saving in order to preserve the energy resources of the country and to rationalise consumption. Among the adopted measures, we indicate theses ones: the productionpsilas optimizatio...

The theory of operating synchronous monophased machines goes back to the I9 century. As a mailer of fact, in 1893, Boucherot indicated the existence of statoric field of the alternative type rather than of the resolving type. Afterwards, he showed that fields could be decomposed into two fields: one which related the rotor to the speed where m was...

In an electrical network, the adaptation of the production to the consumption is carried out automatically by the ordering of the turbines actuating the alternators. The balance frequency results from the combination of the static characteristics of the regulators. The fluctuations of the frequency be they slow or major are caught up with the regul...