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Time filter

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Benaissa A.,University of Djelfa Cite Ain Chih | Rabhi B.,University Mohamed Khider of Biskra | Moussi A.,University Mohamed Khider of Biskra | Benkhoris M.F.,University of Nantes
International Journal of Systems Assurance Engineering and Management | Year: 2014

This paper presents a five-level inverter which is used as a three-phase four leg shunt active power filter, taking advantages of the multilevel inverter such as low harmonic distortion and reduced switching losses. It is used to suppress harmonic current, compensate reactive power and neutral line current and balance the load currents under unbalanced non-linear load and distorted voltage conditions. The active power filter control is essentially based on the use of self tuning filters for the reference current generation and a fuzzy logic current controller. This study is divided in two parts. The first one deals with the harmonic isolator which generates the harmonic reference currents. The second part focuses on the generation of the switching pattern of the inverter by using a fuzzy logic controller applied and extended to a four leg five level shunt active power filter. The MATLAB Fuzzy Logic Toolbox is used for implementing the fuzzy logic control algorithm. The performance of the proposed shunt active power filter controller is found considerably effective and adequate to compensate harmonics, reactive power and neutral current and balance load currents under distorted voltage conditions. © 2013 The Society for Reliability Engineering, Quality and Operations Management (SREQOM), India and The Division of Operation and Maintenance, Lulea University of Technology, Sweden. Source


Nedjimi B.,University of Djelfa Cite Ain Chih | Beladel B.,University of Djelfa Cite Ain Chih
Journal of Applied Research on Medicinal and Aromatic Plants | Year: 2015

Instrumental neutron activation analysis has been used to make a multi-elemental determination in Artemisia herba-alba Asso, a traditional medicine plant used in Algeria to treat diabetes mellitus. The exactitude of the results was assessed by analyzing the certified reference material GBW 07605 (GSV-4) tea leaves. A. herba-alba was characterized by high K and Ca contents. However toxic elements in this species were within the safety limits suggested by WHO/FAO. These data analysis for this medicinal plant can be useful for therapeutics and pharmaceutical purposes. © 2015 Elsevier GmbH. Source

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