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Boutoubat M.,University of Laghouat | Mokrani L.,University of Laghouat | Machmoum M.,37 Boulevard Of Luniversite
Renewable Energy | Year: 2013

The aim of this paper is to improve the reactive power compensation and active filtering capability of a Wind Energy Conversion System (WECS). The proposed algorithm is applied to a Doubly Fed Induction Generator (DFIG) with a stator directly connected to the grid and a rotor connected to the grid through a back-to-back AC-DC-AC PWM converter. The control strategy of the Rotor Side Converter (RSC) aims, at first, to extract a maximum of power under fluctuating wind speed. Then, depending on the rate power of the RSC, the power quality can be improved by compensating the reactive power and the grid harmonics current due to nonlinear loads. Hence, the RSC is controlled in order to manage the WECS function's priorities, between production of the maximum active power captured from the wind, and power quality improvement. The main goal of the proposed control strategy is to operate the RSC at its full capacity, without any over-rating, in terms of reactive power compensation and active filtering capability. Elsewhere, the Grid Side Converter (GSC) is controlled in such a way to guarantee a smooth DC voltage and ensure sinusoidal current in the grid side. Simulation results show that the wind turbine can operate at its optimum power point for a wide range of wind speed and power quality can be improved. It has been shown also that the proposed strategy allows an operating full capacity of the RSC in terms of reactive power compensation and active filtering. © 2012 Elsevier Ltd.


Boutoubat M.,University of Laghouat | Mokrani L.,University of Laghouat | Machmoum M.,37 Boulevard Of Luniversite
International Review on Modelling and Simulations | Year: 2012

In this paper, a novel control strategy is proposed to exploit the full capability, in terms of active filtering, of a Wind Energy Conversion System (WECS) based on a Doubly Fed Induction Generator (DFIG). The rotor is connected to the grid through AC-DC-AC Power converters. The proposed algorithm is applied to the Rotor Side Converter (RSC) to achieve simultaneously the Maximum Power point Tracking (MPPT) and the power quality improvement at the Point of Common Coupling (PCC). Depending on the nominal RSC power, reactive power of linear loads and harmonic currents due to the nonlinear loads can be compensated. The proposed RSC control strategy manages the WECS function's priorities between active power production, reactive power compensation and active filtering without any over-rating. To exploit the full capability of the RSC, in terms of active filtering, it is proposed to eliminate the whole of the 5th and the 7th predominant components if possible. Otherwise, one may filter a part of them in such a way that the RSC operates at its full capability in terms of power. The Grid Side Converter (GSC) is controlled in such a way to guarantee a smooth DC voltage. The presented simulation results demonstrate the effectiveness of the proposed control strategy. © 2012 Praise Worthy Prize S.r.l. - All rights reserved.


Merhy M.,ESEO | Morel C.,ESEO | Chauveau E.,ESEO | Machmoum M.,37 Boulevard Of Luniversite
Proceedings of the International Conference on Optimisation of Electrical and Electronic Equipment, OPTIM | Year: 2010

Recently, power factor correction (PFC) boost converters have been reported as exhibiting a wide range of bifurcations and chaos under specific conditions [1]. In this paper, we derived a nonlinear model from one point of observation to the next. Analysis of this model shows that chaos and bifurcations may occur along with the changing values of some system parameters. A current-mode controlled PFC boost converter in chaotic behavior is chosen as an application example. A numerical simulation using MATLAB confirms the predicted bifurcations. Finally, a blockset model using Simulink/Matlab is designed to conclude the validity of the numerical simulation. ©2010 IEEE.


Hamimid M.,University Mohamed Khider of Biskra | Mimoune S.M.,University Mohamed Khider of Biskra | Feliachi M.,37 Boulevard Of Luniversite
Physica B: Condensed Matter | Year: 2012

In this present work, the minor hysteresis loops model based on parameters scaling of the modified Jiles-Atherton model is evaluated by using judicious expressions. These expressions give the minor hysteresis loops parameters as a function of the major hysteresis loop ones. They have exponential form and are obtained by parameters identification using the stochastic optimization method simulated annealing. The main parameters influencing the data fitting are three parameters, the pinning parameter k, the mean filed parameter α and the parameter which characterizes the shape of anhysteretic magnetization curve a. To validate this model, calculated minor hysteresis loops are compared with measured ones and good agreements are obtained. © 2012 Elsevier B.V. All rights reserved.


Hamimid M.,University Mohamed Khider of Biskra | Hamimid M.,University of Bordj Bou Arreridj | Mimoune S.M.,University Mohamed Khider of Biskra | Feliachi M.,37 Boulevard Of Luniversite
Physica B: Condensed Matter | Year: 2013

In this paper, we present a Langevin transforms model which evaluates accurately minor hysteresis loops for the modified inverse Jiles-Atherton model by using appropriate expressions in order to improve minor hysteresis loops characteristics. The parameters of minor hysteresis loops are then related to the parameters of the major hysteresis loop according to each level of maximal induction by using Langevin transforms expressions. The stochastic optimization method "simulated annealing" is used for the determination of the Langevin transforms coefficients. This model needs only two experimental tests to generate all hysteresis loops. The validity of the Langevin transforms model is justified by comparison of calculated minor hysteresis loops to measured ones and good agreements are obtained with better results than the exponential transforms model (Hamimid et al., 2011 [4]). © 2013 Elsevier B.V.

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