WEBREVIEW

Comparaison entre les différents modèles électriques et détermination des paramètres de la caractéristique I-V d'un module photovoltaïque

Khezzar A. , Khezzar R. , Zereg M. — 2012-01-26T14:19:18Z

La modélisation mathématique des cellules solaires est indispensable pour toute opération d'optimisation du rendement ou de diagnostic du générateur photovoltaïque. Le module photovoltaïque est représenté généralement par un circuit équivalent dont les paramètres sont calculés expérimentalement en utilisant la caractéristique courant-tension, I-V. La détermination précise de ces paramètres reste un challenge pour les chercheurs, ce qui a conduit à une grande diversification dans les modèles et les méthodes (...)

- Numéro 03 / Méthodes numériques, Module photovoltaïque - Si-cristallin, Modèles - Paramètres spécifiques de la caractéristique I-V

Cascade sliding mode controller

Boucherma M. , Hacil M.E. , Khezzar A. , Louze L. , Nemmour A.L. — 2012-01-18T08:57:02Z

This paper presents a simple control structure based on the sliding mode
algorithm for an isolated-loaded induction generator (IG). The machine delivers an active
power to a dc-load via a converter connected to a single capacitor on the dc side. Since
the converter/capacitor model is nonlinear, the sliding mode technique constitutes a
powerful tool to ensure the dc-bus voltage regulation. The computer simulations are
provided to verify the validity of the proposed control (...)

Harmonic current cancellation and control of a grid-connected synchronous generator entrained by a wind turbine

Hacil M. , Khezzar A. , Louze L. , Nemmour A.L. — 2012-01-16T07:41:33Z

Nonlinear devices, such as power electronics converters inject harmonic
currents in the AC system and increase overall reactive power demanded by the
equivalent load. Also, the number of sensitive loads that require ideal sinusoidal supply
voltages for their proper operation has increased. In order to keep power quality under
limits proposed by standards, it is necessary to include some sort of compensation.
Different types of power quality compensators of higher or lower complexity have been
reported. It is now well known that an active filter can easily compensate for harmonic
current contents in the load current by inserting negative harmonics into the power
network. The aim of this paper is to present the efficiency of the electrical part of a wind
generation system with a synchronous generator. In attempt to minimize the commutation
frequency harmonics in the current and voltage in the stator and to avoid the overlap
phenomenon in the diode bridge, an LC filter is inserted between the excited circuit and
the DC-DC converter. Simulation results are curried out to validate the proposed
solution.