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var str = 'Design and Evaluation of a DSP Based Differential Relay of Power Transformer';
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]]>
Algorithm]]>
Differential]]>
DSP]]>
Digital]]>
power transformer]]>
harmonic analysis]]>
The problem of mal operation of differential protection of power transformer due to the inrush magnetizing current has long considered as a challenging problem. Several types of protection relays have been used to solve the issue (basic relay, percentage relay, multi slop ….). Each of them has its advantage and its limits. In this paper, a Digital differential relay has been developed and simulated. The logic used to distinguish between the inrush current and the internal fault is based on the theory of harmonic analysis. The behavior of the presented relay has been simulated versus various situations (inrush current, internal fault and external fault). The obtained results show that the proposed algorithm provides a good discrimination and a fast action.]]>
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var str = 'ABDELMOUMENE, Abdelkader';
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]]>
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var str = 'BOUDERBALA, Rachid';
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]]>
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var str = 'BENTARZI, Hamid';
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]]>
Algerian Journal of Signals and Systems ; Vol. 1 No. 1 (2016); 69-78]]>
2676-1548]]>
2543-3792]]>
10.51485/ajss.v1i1]]>
Laboratory of Signals and Systems, Algeria]]>
2016-06-15]]>
Copyright (c) 2016 Abdelkader ABDELMOUMENE, Rachid BOUDERBALA, Hamid BENTARZI]]>
https://creativecommons.org/licenses/by-nc/4.0]]>
https://ajss.dz/index.php/ajss/article/view/20/8]]>
application/pdf]]>
eng]]>
info:eu-repo/semantics/article]]>
info:eu-repo/semantics/publishedVersion]]>
Peer-reviewed Article]]>
https://ajss.dz/index.php/ajss/article/view/20]]>
10.51485/ajss.v1i1.20]]>
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var str = 'Sliding mode control of a Five-Phase Series- Connected Two-Motor Drive';
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]]>
Five-phase]]>
asynchronous machine]]>
multi-machine systems]]>
phase’s transposition]]>
vector control]]>
sliding mode control]]>
In this work, we study vector control and sliding mode control of series-connected five-phase two asynchronous machines supplied with a three levels inverter. After presentation of multiphase machines, we worked out the mathematical model of five phase asynchronous machine supplied with voltage inverter. Application of Park transformation reduces considerably the mathematical model of machine. After, we applied vector control and sliding mode control to the five-phase induction machine. After that, we study a multi-machine system which comport five-phase two asynchronous machines supplied with a single voltage inverter. In the last, we had the independent vector control and the sliding mode control of series-connected five-phase two asynchronous machines. We observe that an appropriate transposition of phase’s order permits an independent control of two machines.]]>
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var str = 'NEZLI, Lazhari';
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]]>
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var str = 'Zouaid, Omar';
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]]>
Algerian Journal of Signals and Systems ; Vol. 1 No. 1 (2016); 59-68]]>
2676-1548]]>
2543-3792]]>
10.51485/ajss.v1i1]]>
Laboratory of Signals and Systems, Algeria]]>
2016-06-15]]>
Copyright (c) 2016 Lazhari NEZLI, Omar Zouaid]]>
https://creativecommons.org/licenses/by-nc/4.0]]>
https://ajss.dz/index.php/ajss/article/view/19/7]]>
application/pdf]]>
eng]]>
info:eu-repo/semantics/article]]>
info:eu-repo/semantics/publishedVersion]]>
Peer-reviewed Article]]>
https://ajss.dz/index.php/ajss/article/view/19]]>
10.51485/ajss.v1i1.19]]>
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var str = 'Hyperchaos-Based Cryptosystem for Multimedia Data Security';
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]]>
Hyperchaos Lorenz System]]>
HRNG]]>
Multimedia security]]>
C#]]>
In this paper, we present a software development of multimedia streaming encryption using Hyperchaos-based Random Number Generator (HRNG) implemented in C#. The software implements and uses the proposed HRNG to generate keystream for encrypting and decrypting real-time multimedia data. The used HRNG consists of Hyperchaos Lorenz system which produces four signal outputs taken as encryption keys. The generated keys are characterized by high quality randomness which is confirmed by passing standard NIST statistical tests. Security analysis of the proposed encryption scheme through image and audio security analysis confirms its robustness against different kind of attacks.]]>
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var str = 'Benzegane, S.';
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]]>
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var str = 'Sadoudi, S.';
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]]>
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var str = 'Djeddou, M.';
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]]>
Algerian Journal of Signals and Systems ; Vol. 1 No. 1 (2016); 47-58]]>
2676-1548]]>
2543-3792]]>
10.51485/ajss.v1i1]]>
Laboratory of Signals and Systems, Algeria]]>
2016-06-15]]>
Copyright (c) 2016 S. Benzegane, S. Sadoudi, M. Djeddou]]>
https://creativecommons.org/licenses/by-nc/4.0]]>
https://ajss.dz/index.php/ajss/article/view/18/6]]>
application/pdf]]>
eng]]>
info:eu-repo/semantics/article]]>
info:eu-repo/semantics/publishedVersion]]>
Peer-reviewed Article]]>
https://ajss.dz/index.php/ajss/article/view/18]]>
10.51485/ajss.v1i1.18]]>
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var str = 'A Combined Sliding Mode Space vector Modulation Control of the Shunt Active Power Filter Using Robust Harmonic Extraction Method';
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]]>
Shunt Active Power Filter]]>
Multivariable Filter]]>
Space vector Modulation]]>
Sliding Mode controller]]>
This paper presents a combined sliding mode space vector modulation control of the shunt active power filter using robust harmonic extraction method to improve the power quality such as current harmonics and reactive power compensation due to the non-linear loads and unbalanced voltage source. To verify the validity of the analysis and the feasibility of the proposed control method a set of simulation tests have been conducted using Matlab/Simulink. A comparison between the conventional instantaneous powers method (PQ) used for harmonic extracting and the new PQ based on a multivariable extraction filter demonstrates the superiority of the proposed control scheme.]]>
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var str = 'DAHDOUH, ADEL';
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]]>
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var str = 'BARKAT, SAID';
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]]>
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var str = 'CHOUDER, AISSA';
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]]>
Algerian Journal of Signals and Systems ; Vol. 1 No. 1 (2016); 37-46]]>
2676-1548]]>
2543-3792]]>
10.51485/ajss.v1i1]]>
Laboratory of Signals and Systems, Algeria]]>
2016-06-15]]>
Copyright (c) 2016 ADEL DAHDOUH, SAID BARKAT, AISSA CHOUDER]]>
https://creativecommons.org/licenses/by-nc/4.0]]>
https://ajss.dz/index.php/ajss/article/view/17/5]]>
application/pdf]]>
eng]]>
info:eu-repo/semantics/article]]>
info:eu-repo/semantics/publishedVersion]]>
Peer-reviewed Article]]>
https://ajss.dz/index.php/ajss/article/view/17]]>
10.51485/ajss.v1i1.17]]>
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var str = 'Photovoltaic effect in Light Emitting Diodes';
document.write(linkifyHtml(str, options));
]]>
LEDs]]>
Photovoltaic]]>
effect]]>
Characterization]]>
light intensity]]>
This paper describes an experimental work on the electrical characterization of commercial LED of different colors and their photoelectric effect. A research work has been carried out to develop the experimental measurement in order to show the presence of a photovoltaic effect on LEDs. For this purpose, we measured the electrical characteristics of individual LED and studied their light intensities using a pyranometer EPLEY. This work focused mainly on red, green and yellowLEDs. Moreover, we have implemented an experimental system for the measurement of sensitivity of different LEDs depending on the power of light from a light source. A comparison was made between theoretical model and experimental results.]]>
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var str = 'Remidi, K.';
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]]>
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var str = 'Cheknane, A.';
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]]>
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var str = 'Haddadi, M.';
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]]>
Algerian Journal of Signals and Systems ; Vol. 1 No. 1 (2016); 30-36]]>
2676-1548]]>
2543-3792]]>
10.51485/ajss.v1i1]]>
Laboratory of Signals and Systems, Algeria]]>
2016-06-15]]>
Copyright (c) 2016 K. Remidi, A. Cheknane, M. Haddadi]]>
https://creativecommons.org/licenses/by-nc/4.0]]>
https://ajss.dz/index.php/ajss/article/view/16/4]]>
application/pdf]]>
eng]]>
info:eu-repo/semantics/article]]>
info:eu-repo/semantics/publishedVersion]]>
Peer-reviewed Article]]>
https://ajss.dz/index.php/ajss/article/view/16]]>
10.51485/ajss.v1i1.16]]>
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var str = 'Sensitivity Enhancement of Methane Detection Based On Hollow Core Photonic Crystal Fiber';
document.write(linkifyHtml(str, options));
]]>
photonic crystal fiber]]>
methane]]>
finite element method]]>
rsoft cad]]>
Monitoring methane (CH4) concentration is essential in many industrial and environmental applications. Emission of such gases is indeed important to detect for health, safety and environmental reasons. The major risk in all these areas is an explosion hazard, which may occur if methane reaches its Lower Explosive Limit (LEL) of5% concentration in air. For that reason, it is necessary to develop gas sensors to monitor that methane levels below this value. Due to a weak absorption of methane, this gas is difficult to detect using conventional methods.Hollow core photonic crystal fibers (HC-PBF) have emerged as a promising technology in the field of gas sensing. The strong interaction achievable with these fibers are especially advantageous for the detection of weakly absorbing regions of methane. In this paper, we investigated, by full vectorial finite element method (FV-FEM) in Rsoft CAD environment, the dependency of relative sensitivity on the fiber parameters and wavelength. Consequently, we introduced the optimal structureof an index guiding hollow core photonic crystal fiber capable of measuring methane concentrations down to 0.1%in air. The simulations showed that the sensing sensitivity increased with an increase in the core diameter and a decrease in the distance between centers of two adjacent holes.]]>
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var str = 'Boufenar, R.';
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]]>
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var str = 'Bouamar, M.';
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]]>
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var str = 'Hocini, A.';
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]]>
Algerian Journal of Signals and Systems ; Vol. 1 No. 1 (2016); 23-29]]>
2676-1548]]>
2543-3792]]>
10.51485/ajss.v1i1]]>
Laboratory of Signals and Systems, Algeria]]>
2016-06-15]]>
Copyright (c) 2016 R. Boufenar, M. Bouamar, A. Hocini]]>
https://creativecommons.org/licenses/by-nc/4.0]]>
https://ajss.dz/index.php/ajss/article/view/15/3]]>
application/pdf]]>
eng]]>
info:eu-repo/semantics/article]]>
info:eu-repo/semantics/publishedVersion]]>
Peer-reviewed Article]]>
https://ajss.dz/index.php/ajss/article/view/15]]>
10.51485/ajss.v1i1.15]]>
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var str = 'Fault Tolerant Control of Induction Motor Drives Subject to Rotor Resistance Adaptation';
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]]>
Adaptive observer]]>
fault tolerant control]]>
induction machine]]>
vector control]]>
This paper describes the synthesis of a vector fault tolerant control of induction motor drives using an adaptive observer. This observer is used to detect the rotor resistance and flux components using the stator terminal voltages and currents. The rotor resistance is adapted using a new algorithm which does not imply a high computational load. Stability analysis based on Lyapunov theory is performed in order to guarantee the closed loop stability. The rotor resistance is used for the correction of the controllers and the rotor time constant. To verify the tolerance and the applicability of this control, we consider the stator inter-turn fault which is frequently encountered in practice. An analytical method for the modelling of this fault is presented. The equations which describe the transient as well as steady state behavior of unsymmetrical induction machine including the computation of machine inductances are presented. These inductances are calculated analytically using the magnetic field distribution through the machine air-gap. Simulation results are provided to evaluate the consistency and performance of the proposed fault tolerant control of induction motor based vector control.]]>
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var str = 'Boumalha, N.';
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]]>
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var str = 'Kouchih, D.';
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]]>
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var str = 'Tadjine, M.';
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]]>
var options = {
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var str = 'Boucherit, M.S.';
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]]>
Algerian Journal of Signals and Systems ; Vol. 1 No. 1 (2016); 11-22]]>
2676-1548]]>
2543-3792]]>
10.51485/ajss.v1i1]]>
Laboratory of Signals and Systems, Algeria]]>
2016-06-15]]>
Copyright (c) 2016 N. Boumalha, D. Kouchih, M. Tadjine, M.S. Boucherit]]>
https://creativecommons.org/licenses/by-nc/4.0]]>
https://ajss.dz/index.php/ajss/article/view/13/2]]>
application/pdf]]>
eng]]>
info:eu-repo/semantics/article]]>
info:eu-repo/semantics/publishedVersion]]>
Peer-reviewed Article]]>
https://ajss.dz/index.php/ajss/article/view/13]]>
10.51485/ajss.v1i1.13]]>
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var str = 'Digital Control Fuzzy Logic for a Water Tank Level Using Arduino';
document.write(linkifyHtml(str, options));
]]>
Fuzzy logic control has been successfully utilized in various industrial applications; it is generally used in complex control systems, such as chemical process control. Today, most of fuzzy logic controls are still implemented on expensive high performance processors. This paper analyzes the effectiveness of a fuzzy logic control using a low cost controller applied to water level control system. The paper also gives a low cost hardware solution and practical procedure for system identification and control. We started, first by identifying the process to obtain its mathematical model. Then we used two methods to control our system (PI and fuzzy control). Simulation and experimental results are presented.]]>
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var str = 'CHABNI, Fayçal';
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]]>
var options = {
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var str = 'TALEB, Rachid';
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]]>
var options = {
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var str = 'BENBOUALI, Abderrahmen';
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]]>
var options = {
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var str = 'BOUTHIBA, Mohammed Amin';
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]]>
Algerian Journal of Signals and Systems ; Vol. 1 No. 1 (2016); 2-10]]>
2676-1548]]>
2543-3792]]>
10.51485/ajss.v1i1]]>
Laboratory of Signals and Systems, Algeria]]>
2016-06-15]]>
Copyright (c) 2016 Fayçal CHABNI, Rachid TALEB, Abderrahmen BENBOUALI, Mohammed Amin BOUTHIBA]]>
https://creativecommons.org/licenses/by-nc/4.0]]>
https://ajss.dz/index.php/ajss/article/view/12/1]]>
application/pdf]]>
eng]]>
info:eu-repo/semantics/article]]>
info:eu-repo/semantics/publishedVersion]]>
Peer-reviewed Article]]>
https://ajss.dz/index.php/ajss/article/view/12]]>
10.51485/ajss.v1i1.12]]>
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var str = 'Rotor Fault Detection in Squirrel Cage Induction Motors using MCSA and DWT Techniques';
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]]>
Broken rotor bar faults]]>
Discrete wavelet transform]]>
Motor current signature analysis]]>
This article presents the fault detection of broken rotor bar (BRB) faults in squirrel cage induction motors (SCIMs). This work applied two diagnostic methods on stator current signal. It is necessary to verify the machine health to avoid any catastrophic damage. The first method uses the fast Fourier transform (FFT) which is generally called motor current signature analysis (MCSA). We carefully verified the spectral content of the stator current to detect BRB fault. The new harmonics allows us to take a good decision about BRB fault. The second method is based on the discrete wavelet transform (DWT). This technique is widely used in the diagnosis field of rotating machinery. According to DWT method, we used the mean square error (MSE) as a good indicator. An experimental test with different conditions of the induction motor has been performed. The experimental results have been exploited using MCSA and DWT methods to achieve a good decision.]]>
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var str = 'BESSOUS, Noureddine';
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]]>
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]]>
Algerian Journal of Signals and Systems ; Vol. 6 No. 1 (2021): Algerian Journal of Signals and Systems; 41-48]]>
2676-1548]]>
2543-3792]]>
10.51485/ajss.v6i1]]>
Laboratory of Signals and Systems, Algeria]]>
2021-03-31]]>
Copyright (c) 2021 Noureddine BESSOUS, Salim SBAA, Remus PUSCA, Raphaël ROMARY]]>
https://creativecommons.org/licenses/by-nc/4.0]]>
https://ajss.dz/index.php/ajss/article/view/7/108]]>
application/pdf]]>
eng]]>
info:eu-repo/semantics/article]]>
info:eu-repo/semantics/publishedVersion]]>
Peer-reviewed Article]]>
https://ajss.dz/index.php/ajss/article/view/7]]>
10.51485/ajss.v6i1.7]]>
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var str = 'Voltage Sensorless Direct Power Control for PWM Rectifier Under Distorted Network Using Improved Virtual Flux Estimator';
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PWM-Rectifier]]>
Direct power control (DPC)]]>
Space vector modulation (SVM)]]>
Virtual flux (VF)]]>
Second-order generalized integrator (SOGI)]]>
Generally, AC-DC conversion system in the power system use the diode-bridge based rectifiers that cannot be reversible and causes high current distortion. Besides, they reduce the power factor and energy quality. recently, the application of three-phase pulse width modulation (PWM) rectifier has been risen quickly due to breakthrough advancement in the power devices. This converter offers sinusoidal input currents and minimized harmonic distortion and unity power factor. This work presents an improved sensorless control for performance enhancement purpose of the PWM-rectifier. The proposed control strategy uses the virtual flux principle with second-order generalized integrator (SOGI) in order to overcome the accompanying drawbacks of using pure integrator of low-pass filters for estimation. The integration of improved virtual flux estimator with direct power control saves the cost of using many voltage sensors which can increase the reliability and effectivity of the control system. Moreover, it improves control robustness and against highly distorted network. The different proposed approaches have been investigated through simulation using MATLAB/Simulink software.]]>
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var str = 'DJABALI , Sarah';
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var str = 'AIT HAMOU ALI, Melissa';
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var str = 'AMMAR, Abdelkarim';
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]]>
Algerian Journal of Signals and Systems ; Vol. 6 No. 1 (2021): Algerian Journal of Signals and Systems; 32-40]]>
2676-1548]]>
2543-3792]]>
10.51485/ajss.v6i1]]>
Laboratory of Signals and Systems, Algeria]]>
2021-03-31]]>
Copyright (c) 2021 Sarah DJABALI , Melissa AIT HAMOU ALI, Abdelkarim AMMAR]]>
https://creativecommons.org/licenses/by-nc/4.0]]>
https://ajss.dz/index.php/ajss/article/view/6/107]]>
application/pdf]]>
eng]]>
info:eu-repo/semantics/article]]>
info:eu-repo/semantics/publishedVersion]]>
Peer-reviewed Article]]>
https://ajss.dz/index.php/ajss/article/view/6]]>
10.51485/ajss.v6i1.6]]>