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A robust model-free controller for a three-phase grid-connected photovoltaic system based on ultra-local model

Protection and Control of Modern Power Systems 2021年第1期6卷 538-550页

作者： ahsene boubakir Sid-Ahmed Touil Salim Labiod Nasserdine Boudjerda LAJ Faculty of Science and TechnologyUniversity of JijelBP.98Ouled Aissa18000JijelAlgeria Department of Electrical Engineering University of JijelJijelAlgeria LER Faculty of Sciences and TechnologyUniversity of JijelBP 98Ouled Aissa18000JijelAlgeria

In this paper, a robust model-free controller for a grid-connected photovoltaic (PV) system is designed. The system consists of a PV generator connected to a three-phase grid by a DC/AC converter. The control objectives of the overall system are to extract maximum power from the PV source, to control reactive power exchange and to improve the quality of the current injected into the grid. The model-free control technique is based on the use of an ultra-local model instead of the dynamic model of the overall system. The local model is continuously updated based on a numerical differentiator using only the input–output behavior of the controlled system. The model-free controller consists of a classical feedback controller and a compensator for the effects of internal parameter changes and external disturbances. Simulation results illustrate the efficiency of the controller for grid-connected PV systems.

关键词： Photovoltaic system Maximum power point Model-free control Ultra-local model Numerical differentiator

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The Overexpressed FAK （Focal Adhesion Kinase） in Higher Grade Human Urothelial Tumors

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Journal of Life Sciences 2013年第1期7卷 1-7页

作者： Baz ahsene Ousmaal Mohamed E Fadell Mammeri Saadia Zineddine-Charef Amir Frederic Boudard Frederic Hollande Belal Tahar Jean Giaimis Laboratory of animal physiology and cell signaling ENS Kouba Algiers 16000 Algeria Hospital Beni Messous Algiers 16000 Algeria Hospital Mustapha Algiers 16000 Algeria UMR Qualisud- Faculty of Pharmacy University of Montpellier I Montpellier 34093 France Laboratory-body and structure of matter ENS Kouba Algiers 16000 Algeria

Malignant transformation of normal cells involves important structural and functional changes, particularly in cell adhesion. In this study, we wanted to assess whether changes in the expression of FAK, a tyrosine kinase, which is recruited to focal adhesions and plays a key role in cell migration, proliferation and survival, could reflect the invasive capacity of bladder carcinomas. The aim of this study was to evaluate the FAK expression in cancer ceils as an important prognostic factor of the evolution of bladder carcinomas. Tumor and paired peritumoral biopsies were obtained during transurethral endoscopic resection or cystectomy of bladder tumors in 280 patients at the Urology Unit of the Mustapha Hospital of Algiers and the Hospital of Tizi-Ouzou （Algeria）. The authors studied FAK expression in samples from bladder carcinomas at different stages of malignant transformation by western blot analysis using a specific anti-FAK antibody. Western blot is one of the most common laboratory techniques; it is used to detect the presence of a specific protein in a complex mixture extracted from cells. A weak increase in FAK expression was observed in tumors of grade 1 and 2 （1.65; 2.99） as compared to healthy tissues; it became particularly important in grade 3 tumors; the authors show that FAK levels significantly increased gradually according to the tumor stage.

关键词： Bladder cancer focal adhesion kinase retrodifferentiation.

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Forced Convection of the Bi and Three-Dimensional Flow in a Periodic Channel

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材料科学与工程（中英文B版） 2013年第10期3卷 683-688页

作者： Rahima Benchabi ahsene Lanani Mechanical Engineering Department Faculty of Technology and Engineering University of Constantine lConstantine 25000 A lgeria Mathematics Department Faculty of Sciences University of Constantine l Constantine 25000 Algdria

The present investigation concerns the numerical study of turbulent flow and heat transfer of the forced convection in a bi and three-dimensional corrugated channel by using periodicity condition. In this study, a model based on finite volume method is used. The treatment of coupling pressure-velocity is assured by the SIMPLE algorithm. Turbulence is simulated via two equation (k-ε) model. The numerical results are obtained for air with a Prandtl number Pr = 0.7 and for Reynolds number based on hydraulic diameter of the channel varying between 1,200 and 4,000. The effects of the Reynolds number, the aspect ratio H/S, the corrugation angle and the heat transfer characteristics are discussed.

关键词：强迫对流换热三维流动信道周期性 SIMPLE算法波纹通道有限体积法数值模拟

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