Publications Internationales

Permanent URI for this collectionhttps://dspace.univ-boumerdes.dz/handle/123456789/13

Browse

Author: search.filters.author.Bentarzi, HamidEnd date: 2019

Search Results

Now showing 1 - 10 of 43
  • No Thumbnail Available
    Item
    Human–Robot shared control for path generation and execution
    (Springer, 2019) Belaidi, Hadjira; Hentout, Abdelfetah; Bentarzi, Hamid
    A telerobotic system consists of integrating an operator into the control loop of a remote robot. Due to safety considerations, it is very important sometimes that the operator be able to remotely take control of the task and the robot. In this paper, a shared control mode for mobile robots is defined according to the operator ability to control the robot and the autonomy level of the robot itself. In this mode, the task execution is simultaneously accomplished by the operator and the robot, according to the percentage of the task-share coefficient. This depends on several factors such as robot autonomy, user ability, environment accessibility and task difficulty. An experimental application of the developed shared control for path generation task execution is planned for a non-holonomic mobile robot evolving inside a workspace cluttered with static obstacles. In this case, Non-Uniform Rational B-Splines curves are used to generate the robot path linking the Starting point I and the Target point F. The operator can control the robot even by selecting or inserting new control points on the initial feasible path, or by directly moving the robot via the developed Human/Robot Interface or the joystick
  • No Thumbnail Available
    Item
    Differential relay reliability enhancement using fourth harmonic for a large power transformer
    (Springer, 2017) Bouderbala, Rachid; Bentarzi, Hamid
    A differential relay that is very sensitive relayoperating even at its limits may be used for protecting apower transformer. However, this characteristic may leadto unnecessary tripping due to transient currents such as aninrush and over excitation current. In order to avoid thismal-operation of the relay, a second and fifth harmonicblocking technique has been used; however this techniqueis not reliable if a second harmonic magnitude is weak. Inthis paper, a new approach is proposed using even har-monics (second and fourth). The test results show that thisproposed approach is a good blocking technique associatedwith the differential relay even for large modern powertransformer which has small second harmonic as well; itprovides a good discrimination between the transient cur-rents and the internal fault currents during internal fault.
  • No Thumbnail Available
    Item
    Comprehensive learning bat algorithm for optimal coordinatedtuning of power system stabilizers and static VAR compensator inpower systems
    (Taylor and Francis Ltd, 2019) Bousaadia, Baadji; Bentarzi, Hamid; Bakdi, Azzeddine
    This article presents a novel comprehensive learning bat algorithm (CLBAT)for the optimal coordinated design of power system stabilizers (PSSs)and static VAR compensator (SVC) for damping electromechanical oscilla-tions in multi-machine power systems considering a wide range of oper-ating conditions. The CLBAT incorporates a new comprehensive learningstrategy (CLS) to improve microbat cooperation; location updating is alsoimproved to maintain the bats’ diversity and to prevent premature con-vergence through a novel adaptive search strategy based on relative trav-elled distance. In addition, the proposed elitist learning strategy speedsup convergence during the optimization process and drives the globalbest solution towards promising regions. The superiority of the CLBATover other algorithms is demonstrated via several experiments and com-parisons through benchmark functions. The developed algorithm ensuresconvergence speed, credibility, computational resources and optimal tun-ing of PSSs and SVCs of multi-machine systems under different operatingconditions through eigenanalysis, nonlinear simulation and performanceindices.
  • No Thumbnail Available
    Item
  • No Thumbnail Available
    Item
    STUDY OF FERRORESONANCE FAVORABLE CASES IN ELECTRIC SUBSTATIONS
    (2018) Boutora, Saliha; Bentarzi, Hamid
    Ferroresonance is a phenomenon of complex nature which may be studied profoundly for avoiding it and protect the power equipment with appropriate protective devices when it occurs. The accuracy of the transformer model and the power system’s parameters has a direct effect on the prediction of this phenomenon. A distribution network consists of generators, transformers, capacitors, motors and protective devices may undergo a ferroresonance during some operating situations such as the de-energization of a transformer through a grading capacitor of circuit breaker, a transformer accidentally energized in only one or two phases, or transformer with ongoing phase-to-ground fault. These scenarios are simulated using the data taken from Haoud Berkaoui station in Algeria. A simulation with alternative transients program has been conducted; the obtained results are satisfactory.
  • No Thumbnail Available
    Item
    A New Frame Work for Protective Relay Tester
    (Inderscience, 2014) Chafai, Mahfoud; Bentarzi, Hamid; Ouadi, ABDERRAHMANE; Sahli, Hichem; Rial, Hichem
  • No Thumbnail Available
    Item
    A new frame work for quadrilateral distance relay
    (Inderscience, 2014) Ouadi, Abderrahmane; Bentarzi, Hamid
    In conventional transmission line protection, a three–zone stepped directional distance scheme is used to provide the primary as well as remote backup protection. The voltage and current phasors are needed by the distance relay for determining the impedance. In this paper, a new frame work is proposed using DSP kit, which acquires real-time signals of the currents, processes them digitally and outputs tripping signal to the circuit breaker. Algorithms of quadrilateraldistance protection function has been implemented first in PC using the Simulink/Matlab and then transferred into DSP Kit. To validate the present work, the performance of developed relay is tested by signals generated by Simulink/MATLAB simulator under different conditions. The obtained simulation results are satisfactory
  • No Thumbnail Available
    Item
    Distance relay reliability enhancement using false trip root cause analysis
    (Springer, 2017) Zitouni, Abdelkader; Ouadi, Abderrahmane; Bentarzi, Hamid; Chafai, Mahfoud
  • No Thumbnail Available
    Item
  • No Thumbnail Available
    Item
    Optimal multiobjective design of digital filters using taguchi optimization technique
    (2014) Ouadi, Abderrahmane; Bentarzi, Hamid; Recioui, Abdelmadjid
    The multiobjective design of digital filters using the powerful Taguchi optimization technique is considered in this paper. This relatively new optimization tool has been recently introduced to the field of engineering and is based on orthogonal arrays. It is characterized by its robustness, immunity to local optima trapping, relative fast convergence and ease of implementation. The objectives of filter design include matching some desired frequency response while having minimum linear phase; hence, reducing the time response. The results demonstrate that the proposed problem solving approach blended with the use of the Taguchi optimization technique produced filters that fulfill the desired characteristics and are of practical use