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Lalouni S.,University of Abderrahmane Mira de Bejaia | Rekioua D.,University of Abderrahmane Mira de Bejaia | Idjdarene K.,University of Abderrahmane Mira de Bejaia | Tounzi A.,Laboratoire Delectrotechnique Et Delectronique Of Puissance Of Lille
Electric Power Components and Systems | Year: 2015

Due to the instantaneous variation of wind speed, it is suitable to determine the optimal rotational speed that ensures maximum energy efficiency. This article deals with a comparison between different maximum power point tracking algorithms applied to wind energy conversion systems. The most commonly used algorithms are optimal torque control, power signal feedback, tip-speed ratio, and hill-climb search. The conventional hill-climb search method has an important drawback, which is the wrong directionality under rapid wind change. To solve this problem, using a hybrid hill-climb search method is proposed, which consists of combining the optimal torque control and hill-climb search methods. The proposed approach is applied to a wind energy conversion system based on a permanent magnet synchronous generator under a wind speed profile using a MATLAB®-Simulink® (The MathWorks, Natick, Massachusetts, USA) package to achieve the simulation calculations. The obtained results are then presented and compared to those given by classical algorithms to highlight the interest of the proposed approach in terms of efficiency and response speed. © 2015 Taylor & Francis Group, LLC. Source


Lalouni S.,University of Abderrahmane Mira de Bejaia | Rekioua D.,University of Abderrahmane Mira de Bejaia | Idjdarene K.,University of Abderrahmane Mira de Bejaia | Tounzi A.M.,Laboratoire Delectrotechnique Et Delectronique Of Puissance Of Lille
Journal of Electrical Systems | Year: 2014

This paper presents a comparison between MPPT algorithms used for extracting maximum power from the wind energy conversion system (WECS). These MPPT controllers can be classified in to three main control algorithm, namely optimal torque control (OTC), power signal feedback (PSF) and hill-climb search (HCS). Most control schemes use the HCS technique, because it's simple and easy to implement, but it's less efficient and present wrong directionality under rapid variation in wind speed. To solve these problems, Hybrid HCS method (HHCS) is proposed; it combines OTC and HCS control for obtained a step sizes of the hill climb technique. A comparison has been made between the performances of the different MPPT algorithms on the basis of speed responses and ability to achieve the maximum energy. The performance of the proposed control is validated through simulation results. © JES 2014. Source


Crevits Y.,Laboratoire Delectrotechnique Et Delectronique Of Puissance Of Lille | Kestelyn X.,Laboratoire Delectrotechnique Et Delectronique Of Puissance Of Lille | Lemaire-Semail B.,Laue Langevin Institute | Semail E.,Laboratoire Delectrotechnique Et Delectronique Of Puissance Of Lille
European Journal of Electrical Engineering | Year: 2010

This paper deals with a unique causal model in normal and open-circuited phase operation of a electromechanical drive with independent supplied phases. This overall degraded system model is based on a vectorial formalism and the Energetic Macroscopic Representation (EMR). The systematic inversion of the model leads to a control structure using a dedicated controller available in the two operating modes. The simulating validation, the performances verifications in open-circuited mode versus normal mode and the experimental validations establish the validity of the control. Finally, this tree-phase method is adaptable to polyphase machines to bring to light the generality of the method. © 2010 Lavoisier, Paris. Source


Meinguet F.,Laboratoire Delectrotechnique Et Delectronique Of Puissance Of Lille | Semail E.,Laboratoire Delectrotechnique Et Delectronique Of Puissance Of Lille | Kestelyn X.,Laboratoire Delectrotechnique Et Delectronique Of Puissance Of Lille | Mollet Y.,Roosevelt University | Gyselinck J.,Roosevelt University
IET Electric Power Applications | Year: 2014

This study deals with an on-line method for turn-to-turn short-circuit fault detection in low-voltage permanent-magnet synchronous machine drives. Owing to the closed-loop control, the fault effects are reflected in the voltage. Therefore an appropriate diagnostic index is proposed, which is derived from the positive-and negative-sequences of the voltage references. These sequences are obtained in the time domain via adaptive filters, which require only a few calculations. To increase the sensitivity to the fault, the algorithm is only applied to a part of the voltage references, that is, the output of the proportional-integral controllers. Furthermore, the cumulative-sum algorithm is introduced to cope with changes of small magnitudes. This algorithm allows a change of a fault index to be detected and can be used as a decision system. The resulting fault detection schemeis computationally cheap and can be embedded in the control unit. Simulations and experimental results validate the proposed method in steady state and the performances under non-stationary operating conditions are also investigated. © The Institution of Engineering and Technology 2014. Source


Giraud F.,Laboratoire Delectrotechnique Et Delectronique Of Puissance Of Lille | Giraud F.,Laue Langevin Institute | Amberg M.,Laboratoire Delectrotechnique Et Delectronique Of Puissance Of Lille | Amberg M.,Laue Langevin Institute | And 4 more authors.
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2014

The paper presents a serial architecture of an actuated manipulator which uses an ultrasonic motor. The serial architecture allows to modify the kinetic relationship between user’s input and a tool. The design of the device is presented. A load, which exhibits fine details, is used in order to show how a zooming effect of its haptic rendering can be achieved with the haptic magnifier. Finally, the design is validated through an experimental analysis. © Springer-Verlag Berlin Heidelberg 2014. Source

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