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Necaibia A.,Research Unit in Renewable Energies in the Saharan Medium | Necaibia A.,Skikda University | Ladaci S.,Polytechnic School of Algiers | Charef A.,University of Mentouri Constantine | Loiseau J.J.,CNRS Research Institute of Communication and Cybernetics of Nantes
Frontiers in Energy | Year: 2015

Due to the high interest in renewable energy and diversity of research regarding photovoltaic (PV) array, a great research effort is focusing nowadays on solar power generation and its performance improvement under various weather conditions. In this paper, an integrated framework was proposed, which achieved both maximum power point tracking (MPPT) and minimum ripple signals. The proposed control scheme was based on extremum-seeking (ES) combined with fractional order systems (FOS). This auto-tuning strategy was developed to maximize the PV panel output power through the regulation of the voltage input to the DC/DC converter in order to lead the PV system steady-state to a stable oscillation behavior around the maximum power point (MPP). It is shown that fractional order operators can improve the plant dynamics with respect to time response and disturbance rejection. The effectiveness of the proposed controller scheme is illustrated with simulations using measured solar radiation data. © 2014, Higher Education Press and Springer-Verlag Berlin Heidelberg. Source


Necaibia A.,Research Unit in Renewable Energies in the Saharan Medium | Ladaci S.,Polytechnic School of Algiers | Charef A.,University of Mentouri Constantine | Loiseau J.J.,CNRS Research Institute of Communication and Cybernetics of Nantes
2014 22nd Mediterranean Conference on Control and Automation, MED 2014 | Year: 2014

In this paper, we propose a new control scheme based on Extremum-Seeking (ES) combined with Fractional-Order Systems (FOS). This auto-tuning strategy involving a fractional order integral action, is developed to optimize the system response without external dithering, exploiting disturbances already present in the control system. We show by mean of comparative simulation examples that the proposed fractional order ES control algorithm can improve the plant dynamics with respect to response time and disturbance rejection. © 2014 IEEE. Source


Necaibia A.,Research Unit in Renewable Energies in the Saharan Medium | Necaibia A.,Skikda University | Ladaci S.,Polytechnic School of Algiers | Ladaci S.,University of Mentouri Constantine
STA 2014 - 15th International Conference on Sciences and Techniques of Automatic Control and Computer Engineering | Year: 2014

This paper focuses on the development of a robust Fractional Order Extremum-Seeking (FOES) scheme for controlling the ABS of vehicle motion system by continuously adjusting the brake torque. Extremum Seeking (ES) known for its properties to seek the maximum of unknown function and Fractional Order (FO) control for its robustness in the presence of parameter variations and the disturbances are employed to control the wheel slip rate in emergency braking maneuver. The aim of an ABS is to minimize brake distance while steer ability is retained even under hard braking, to understand the fundamental physical effect, which leads to wheel blocking during braking. Simulations under various road conditions are performed to demonstrate the effectiveness of the proposed control scheme. © 2014 IEEE. Source


Gaffour H.,Abou Bekr Belkaid University Tlemcen | Gaffour H.,Research Unit in Renewable Energies in the Saharan Medium | Mokhtari M.,Abou Bekr Belkaid University Tlemcen
Research on Chemical Intermediates | Year: 2016

TiO2/natural hematite-supported bentonite (TiNHB) was successfully synthesized as a heterogeneous catalyst for photodegradation of 4-nitrophenol (4-NP) in aqueous solution. Supporting on TiO2/hematite rendered a significant increase in specific surface area of bentonite. X-ray diffraction and Fourier-transform infrared spectroscopy analyses confirmed the presence of both TiO2 and Fe2O3 nanoparticles in the TiNHB catalyst. The photocatalytic performance of TiNHB was investigated using reduction of 4-nitrophenol (4-NP) as model reaction. The results showed that TiNHB converted nearly 98 % of 4-NP under UV254nm irradiation with optimum operating conditions of 0.025 g/L TiNHB, pH 3, and 20 mg/L 4-NP. The reaction kinetics of the photocatalytic reduction of 4-NP were studied by UV–Vis spectrophotometry, and the apparent rate constant was determined for comparison with TiO2 + Fe2O3. This work is expected to shed new light on the development of new photocatalysts for removal of environmental pollutants. © 2016 Springer Science+Business Media Dordrecht Source


Aoun N.,Research Unit in Renewable Energies in the Saharan Medium | Aoun N.,University of Mentouri Constantine | Nahman B.,University of Mentouri Constantine | Chenni R.,University of Mentouri Constantine | Bouchouicha K.,Research Unit in Renewable Energies in the Saharan Medium
International Journal of Mechanical and Mechatronics Engineering | Year: 2015

This article analyzes and modeling the efficiencies of the energy, the exergy and the power conversion of mono-crystalline photovoltaic module under outdoor weather conditions in Adrar, Algeria (0.18 W, 27.82 N).The experimental data sets are determined for typical clear and cloudy days of March 21 to 23, 2013. The effect of solar radiation, ambient temperature and wind speed on the exergy efficiency is also analyzed. It is observed that the exergy efficiencies vary rapidly throughout the day. However, with an increase of wind speed and ambient temperature there is a decrease in the exergy efficiency. On the other hand, the exergy efficiency increases with an increase in solar radiation. © February 2015 IJENS. Source

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