Wyniki 1-2 spośród 2 dla zapytania: authorDesc:"Mustapha RAHLI"

Solar cell parameters extraction optimization using Lambert function DOI:10.15199/48.2019.04.43

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Solar is an emerging sustainable technology with immense potential to contribute largest investment in Green technology applications. The photovoltaic solar energy is one of the most used and promising resources in the renewable energy domain. The photovoltaic energy conversion is performed by cells based on semiconductors such as silicon, which exploits the photovoltaic effect. The these cells operation cells is described generally by the I-V characteristic which provides the information on the intern electric transport mechanisms and the technological steps imperfections of their fabrications [1-3]. The photovoltaic (PV) systems modeling has been the subject studies many recent, especially with the extension of use PV systems in different applications. The single-diode model cell solar was first used by Shockley in 1949 [4, 5] and has since been used in many other research and applications. This equivalent circuit model is based on five main parameters to be determined. The these parameters precise determination remains a challenge for the researchers, in fact, this determination is essential for the simulation, the quality control and the photovoltaic devices implementation answering to welldefined specifications [6]. These parameters also play an important role in the manufacturing processes optimization [7].The current in the Shockley equation is an implicit function; it includes dependent and independent variables at the same time. Implicit nature presents opposites to extract these parameters. An explicit analytic expression can be obtained using Lambert W [8-16]. In order to overcome these constraints that prevent the electrical parameters extraction, a new method is presented in this work. In its first part, the parameters are calculated using the Lambert function for different estimated values of the ideality factor in the interval [1-1.5], while the second part consists in determining graphically the best estima[...]

An efficient algorithm to tuning PI-controller parameters for shunt active power filter using ant colony optimization

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This paper presents an optimal control method entitled ant colony PI controller (ACO-PI) for extracting the reference compensating currents to shunt active power filter (SAPF) under balanced voltages conditions, which is applied to eliminate line current harmonics and compensate reactive power. Two different control methods has been proposed for SAPF based on proportional-integral (PI) controller and intelligent PI-controller with ACO are presented. The identification theory based on instantaneous power (p-q) is used to establish the suitable current reference signals. The simulation results show that the new control method using ACO approach is not only easy to be implanted, but also very effective in reducing the unwanted harmonics and compensating reactive power. The studies carried out have been accomplished using the MATLAB Simulink Power System Toolbox. Streszczenie. W artykule zaprezentowano wykorzystanie kontrolera PI bazującego na algorytmie mrówkowym ACO do sterowania aktywnym filtrem mocy. Zaproponowano dwie metody sterowania - z kontrolerem PI I kontrolerem ACO. Symulacje wykazały że nowy kontroler jest nie tylko łatwy do implementacji ale także efektywnie redukuje niepożądane harmoniczne i moc bierną. (Skuteczny algorytm strojenia parametrów kontrolera PI wykorzystujący algorytm mrówkowy). Keywords: Shunt active power filter, Total harmonic distortion, current control, PI controller, Ant colony optimization Słowa kluczowe: filtr mocy, zniekształcenie harmoniczne, algorytm mrówkjowy. Introduction The raising use of power electronic equipment in industry and customers has caused harmonic propagation through electrical networks, and lower power factor [6]. Dynamic and flexible solutions to the power quality problems have been examined by researchers and power system [1]. Usually, passive filters have been used to eliminate current harmonics and to increase the power factor. However, the use of passive filter has many disadva[...]

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