Nuclear Research Center of Birine

Ain Oussera, Algeria

Nuclear Research Center of Birine

Ain Oussera, Algeria
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Makhloufi M.,Nuclear Research Center of Birine | Salah H.,Center de Recherche Nucléaire de Draria
Journal of Magnetism and Magnetic Materials | Year: 2017

Unpolarized instrumentation has long been studied and designed using McStas simulation tool. But, only recently new models were developed for McStas to simulate polarized neutron scattering instruments. In the present contribution, we used McStas software to design a polarized neutron beam line, taking advantage of the available spectrometers reflectometer and diffractometer in Algeria. Both thermal and cold neutron was considered. The polarization was made by two types of supermirrors polarizers FeSi and CoCu provided by the HZB institute. For sake of performance and comparison, the polarizers were characterized and their characteristics reproduced. The simulated instruments are reported. Flipper and electromagnets for guide field are developed. Further developments including analyzers and upgrading of the existing spectrometers are underway. © 2016


Salim C.,Nuclear Research Center of Birine
2017 6th International Conference on Systems and Control, ICSC 2017 | Year: 2017

This paper present the performances of five-level (NPC) shunt active power filter based on fuzzy control approaches which can mitigate current harmonics generated by nonlinear loads. Five-level inverter is strongly used in the medium and high voltage applications; these advantages are low harmonic distortions, low switching losses, low electromagnetic interference, low voltage stress of power semiconductors and low acoustic noise. On the other hand fuzzy logic has been widely used in various industrial applications. To benefit from these advantages a novel control scheme based on fuzzy logic is proposed. The reference current signals required to compensate harmonic currents use the synchronous current detection method. Proportional integral voltage controller is used to maintain the dc voltage across capacitor constant and reduce inverter losses. The simulation is performed using Matlab-Simulink and SimPowerSystem toolbox. The results obtained under various operating conditions show the effectiveness of the proposed shunt APF system. © 2017 IEEE.


Bouzidi A.,Nuclear Research Center of Birine | Souahi F.,Polytechnic School of Algiers | Hanini S.,Dr. Yahia Fares University Center of Médéa
Journal of Hazardous Materials | Year: 2010

In the present study, the sorption behavior of cesium was investigated in Ain Oussera soil around the Es-Salam reactor facility. This study was conducted using batch method under different physicochemical conditions including contact time, ionic strength, pH, solid/liquid ratio and temperature. The results showed that sorption followed pseudo-second-order kinetics with a good regression coefficients (R2=0.999). The activation energies were 11.26 and 15.21kJmol-1 which correspond to ion-exchange-type sorption mechanism. The adsorption was favored at low temperature and it was exothermic (ΔH0<0, with average value of -1.97kJmol-1) and spontaneous (ΔG0<0, with average value of -11.97kJmol-1 at 23°C and -13.2kJmol-1 at 60°C). The presence of competing cations such as K+ and Ca2+ ions in groundwater can significantly reduce the Cs adsorption onto soil. Desorption reaction was also investigated using three reagents with different ionic strengths (deionized water, groundwater and 0.1M KCl solution). The results showed that Cs ions were preferentially distributed onto high affinity sorption sites. © 2010 Elsevier B.V.


Chennai S.,Nuclear Research Center of Birine
Revue Roumaine des Sciences Techniques Serie Electrotechnique et Energetique | Year: 2016

This paper proposes an efficient control scheme for unified power quality conditioner (UPQC) system based on three-level neutral point clamped (NPC) inverter capable to compensate all voltage disturbances. The proposed UPQC is designed by the integration of series and shunt active power filters (APFs) sharing a common dc bus capacitor. The dc voltage is maintained constant using proportional integral (PI) voltage controller. To get the reference signals for shunt and series APFs, synchronous reference frame (SRF) and instantaneous reactive power (PQ) strategies are adopted. These reference signals are derived from the control algorithm and injected in PWM controllers to generate the switching signals. The performance of proposed UPQC system is evaluated using MATLAB-Simulink software and SimPowerSystem Toolbox for all voltage disturbances compensation. The simulation results demonstrate that the proposed UPQC system can improve the power quality at the common connection point of the non-linear load.


Salim C.,Nuclear Research Center of Birine | Toufik B.M.,University Mohamed Khider of Biskra
International Journal on Electrical Engineering and Informatics | Year: 2014

This paper presents a shunt active power filter performances based on threelevel (NPC) inverter using conventional pulse width modulation (PWM) and Ann's controllers to mitigate current harmonics generated by non-linear loads. Shunt APF is the best solution to eliminate harmonics drawn from nonlinear load especially for low power system, the conventional scheme based on the two level inverter controlled by hysteresis controller presents several drawbacks such us high inverse voltage applied to power components, degraded output voltage inverter waveforms, etc. Today three-level (NPC) inverter and intelligent controllers are widely used in different industrial applications. To take advantages of these inverter topology and artificial intelligent controller performance a novel control scheme based on Ann's current controller is proposed in this work. The control strategy adopted is the synchronous current detection method, it is easy to implement and permits a good extraction of reference currents compensation. The numerical simulation is performed using MATLAB-Simulink and SimPowerSystem Toolbox. The simulation results obtained in steady and transit states show the effectiveness and the superiority of Ann systems compared to PWM controller.


Chennai S.,Nuclear Research Center of Birine
Periodica Polytechnica, Electrical Engineering | Year: 2016

This paper present simple fuzzy control approaches for shunt active power filter based on five-level (NPC) inverter which can mitigate current harmonics generated by nonlinear loads and compensate reactive power. Today, five-level inverter is strongly used in the medium and high voltage applications; these advantages are low harmonic distortions, low switching losses, low electromagnetic interference and low acoustic noise. Second, fuzzy logic techniques have been successfully employed in several power electronic applications. To benefit from these advantages a novel control scheme based on fuzzy current controller is adopted; it is designed to improve compensation capability by adjusting the current error using a fuzzy rule. The reference current signals required to compensate harmonic currents use the synchronous current detection method, this technique is easy to implement and achieves good results. To maintain the dc voltage across capacitor constant and reduce inverter losses, a proportional integral voltage controller is used. The simulation of global system control and power circuits is performed using Matlab-Simulink and SimPowerSystem toolbox. The results obtained in transient and steady states under various operating conditions show the effectiveness of the proposed shunt active filter based on fivelevel (NPC) inverter using fuzzy control.


Chennai S.,Nuclear Research Center of Birine
Revue Roumaine des Sciences Techniques Serie Electrotechnique et Energetique | Year: 2014

A three-phase three-level (NPC) shunt active power filters controlled by different controllers which can compensate current harmonics generated by nonlinear loads is presented in this paper. Three-level inverters and intelligent controllers have been successfully employed in several power electronic applications these past years. An ANN and fuzzy current controllers are adopted for three-level (NPC) shunt APF to improve the performances of the conventional control scheme. These controllers are proposed to simplify the complicated conventional hysteresis controller and to improve compensation capability of APF. The reference current signals required to compensate harmonics use the synchronous reference current detection method. This technique is easy to implement, require few calculations and achieves good results. To maintain the dc voltage across capacitor constant and reduce inverter losses, a proportional integral voltage controller is used. The simulation is performed using Matlab-Simulink and SimPowerSystem toolbox. The results obtained in transient and steady states under various operating conditions show the effectiveness of the proposed shunt APF based on these intelligent current controllers compared to the conventional scheme.


Hayoune A.,Nuclear Research Center of Birine
International Journal of Modern Physics B | Year: 2013

The precipitation phenomena and the related hardening in an Al-Cu-Mg-Si alloy were studied by calorimetry, X-ray diffraction analysis and microhardness measurements. The main calorimetric peaks were identified to be due to β″, θ′ and Q′ phases precipitation. The hardening during aging at room temperature and 160°C, was respectively, explained by atomic clusters and GP zones formation and by GP zones and β″/θ′ phases coprecipitation. Although the mechanical properties variation during aging at 200°C is simple, the corresponding microstructural evolution is complex: on the basis of the DSC results, the increasing of microhardness values, is mainly due to the coprecipitation of GP zones and β″/θ′ phases, however, the maximum hardening is explained by the coexistence of β″/θ′ and θ″ phases. Another important conclusion is that during aging at 160°C and 200°C, the θ′ phase is essentially developed from GP zones. © 2013 World Scientific Publishing Company.


Salim C.,Nuclear Research Center of Birine | Mohamed Toufik B.,University Mohamed Khider of Biskra
Journal of Electrical Engineering and Technology | Year: 2013

This paper proposes a simplified and efficient control scheme for Unified Power Quality Conditioner (UPQC) based on three-level (NPC) inverter capable to mitigate source current harmonics and compensate all voltage disturbances perturbations such us, voltage sags, swells, unbalances and harmonics. The UPQC is designed by the integration of series and shunt active filters (AFs) sharing a common dc bus capacitor. The dc voltage is maintained constant using proportional integral voltage controller. The shunt and series AF are designed using a three-phase three-level (NPC) inverter. The synchronous reference frame (SRF) theory is used to get the reference signals for shunt and the power reactive theory (PQ) for a series APFs. The reference signals for the shunt and series APF are derived from the control algorithm and sensed signals are injected in tow controllers to generate switching signals for series and shunt APFs. The performance of proposed UPQC system is evaluated in terms of power factor correction and mitigation of voltage, current harmonics and all voltage disturbances compensation in three-phase, three-wire power system using MATLAB-Simulink software and SimPowerSystem Toolbox. The simulation results demonstrate that the proposed UPQC system can improve the power quality at the common connection point of the non-linear load.


Salim C.,Nuclear Research Center of Birine | Toufik B.M.,University Mohamed Khider of Biskra
International Journal on Electrical Engineering and Informatics | Year: 2011

This paper presents a three-phase three-wire shunt active filter based on intelligent controllers to compensate current harmonics. Shunt active filter is the best solution to eliminate harmonics drawn from nonlinear load especially for low power system, the most inverter used is the two-level voltage source. The control strategies adopted to determine the compensation currents are the synchronous reference frame (SRF) detection method and the synchronous current reference (SCR) detection method. To improve the performance of the conventional control scheme based on hysteresis controller and take advantages of intelligent techniques, fuzzy and ANN current controllers are proposed in this paper. To maintain the dc voltage capacitor constant and compensate the inverter losses a proportional integral voltage controller is used. The numerical simulation is developed and performed using MATLAB-Simulink and SimPowerSystemd Toolbox from complete structure including control and power circuits. The obtained results show the simplicity and the effectiveness of the two proposed intelligent current controllers.

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