L\u27objectif de cet article est de démontrer la possibilité de faire osciller à 1.6 µm un amplif... more L\u27objectif de cet article est de démontrer la possibilité de faire osciller à 1.6 µm un amplificateur à fibre double gaine dopée erbium opérant dans la bande C, en ajustant les pertes intra-cavité. Deux configurations de cavité ont été utilisées, une cavité en anneau et une cavité en forme de huit. Dans les deux cas, il est possible d\u27obtenir l\u27oscillation à 1.6 µm en continu ou bien en impulsions ultra-courtes
International Journal of Automation and Computing, 2016
The paper deals with the problem of switched dynamical systems modeling especially in DC-DC conve... more The paper deals with the problem of switched dynamical systems modeling especially in DC-DC converters case study consideration. It presents two approaches to describe accurately the behavior of this class of systems. To clarify the paper s contribution, the proposed approaches are validated through simulations and experimental results. A comparative study, between the obtained results and those of other techniques from the literature, is given to evaluate the performances of the studied approaches.
DC-DC converters are nonlinear systems that exhibit a complicated nonlinear phenomena, its modell... more DC-DC converters are nonlinear systems that exhibit a complicated nonlinear phenomena, its modelling presents the basic step of its analysis and control. In this work, we propose a discrete modelling technique that allows an accurate description of the converter behaviour with a minimum of simplifying assumptions and validity hypothesis. The proposed method validation is achieved by means of simulation and a comparative study results.
Controlling DCDC power converters is to provide better performance and to ensure the system close... more Controlling DCDC power converters is to provide better performance and to ensure the system closed loop stability. Using a simplified averaged model of the converter we propose, in this paper, a design approach of a fuzzy PID. Unlike classical design approach of fuzzy controllers, we choose in our case to fix the controller gains according to the system stability requirements. The proposed approach is also used to make stability maps in the convertercontroller par ameters space. Validation of the fuzzy logic controller design approach and illustration of its efficiency is done through simulations.
DC-DC power converters are characterized by cyclic switching of circuit configurations, which giv... more DC-DC power converters are characterized by cyclic switching of circuit configurations, which gives rise to a variety of nonlinear behaviors. Their occurrence in DC-DC power converters makes the system analysis, control and behavior prediction difficult. An enhanced modeling method allowing obtaining an accurate description of the converter behavior is presented in this paper. The principal of ramp compensation is introduced and dynamical compensation ramp is proposed to both suppress converter nonlinear phenomena and ensure the peak current regulation for a wide range of reference variation.
DC-DC power converters are characterized by cyclic switching of circuit configurations, which giv... more DC-DC power converters are characterized by cyclic switching of circuit configurations, which gives rise to a variety of nonlinear behaviors. Their occurrence in DC-DC power converters makes the system analysis, control and behavior prediction difficult. An enhanced modeling method allowing obtaining an accurate description of the converter behavior is presented in this paper. The principal of ramp compensation is introduced and dynamical compensation ramp is proposed to both suppress converter nonlinear phenomena and ensure the peak current regulation for a wide range of reference variation.
In order to meet the requirements of harmonic elimination and reactive power compensation in subs... more In order to meet the requirements of harmonic elimination and reactive power compensation in substation, a three level four leg shunt active filter is proposed in this paper. The use of three-level converters allows a better performance of the equipment, by reducing harmonics and the ripple of the generated voltages and currents. The compensation algorithm is based on pqr theory. This scheme requires the service of a phased-locked loop (PLL) to make the system insensitive to the distortions that are generally present in the utility voltages. The control system is implemented numerically using Matlab/Simulink tool. The performance of the proposed control approach is finally discussed through the obtained simulation results.
Proceedings of the 48h IEEE Conference on Decision and Control (CDC) held jointly with 2009 28th Chinese Control Conference, 2009
Controlling DC-DC power converters is to provide better performance and to ensure the system clos... more Controlling DC-DC power converters is to provide better performance and to ensure the system closed loop stability. Using a simplified averaged model of the converter we propose, in this paper, a design approach of a fuzzy PID. Unlike classical design approach of fuzzy controllers, we choose in our case to fix the controller gains according to the system stability requirements. The proposed approach is also used to make stability maps in the converter-controller parameters space. Validation of the fuzzy logic controller design approach and illustration of its efficiency is done through simulations.
Grâce aux performances accrues des convertisseurs statiques, de nouveaux champs d'application se ... more Grâce aux performances accrues des convertisseurs statiques, de nouveaux champs d'application se sont ouverts. Certains d'entre eux sont très exigeants en termes de performances dynamiques. Nous pouvons citer comme exemples la dépollution de réseaux électriques, l'alimentation de machines à courant alternatif pour des applications particulières, l'amplification de puissance (audio…). Pour de telles applications, il faudrait un convertisseur idéal, qui génèrerait une tension (ou un courant) de sortie rigoureusement identique à un signal de référence, à un facteur de proportionnalité près, y compris lorsque ce signal varie rapidement. Le transfert d'énergie entre la source et le récepteur serait alors idéalement contrôlé, la plage de fonctionnement serait la plus large possible sans entraîner l'apparition de phénomènes subharmoniques ou chaotiques. Pour cela, il faudrait être en mesure d'abord d'identifier, grâce à une modélisation adéquate, ces phénomènes indésirables. Ensuite, il est nécessaire d'optimiser la stratégie de commande, de manière à assurer une poursuite du signal de référence la meilleure possible, pour un convertisseur donné, commutant à une fréquence imposée par des limitations technologiques. Dans ce cadre que s'inscrit notre contribution dans ce travail de thèse. Un convertisseur statique de base est formé essentiellement de deux types de composants : i) électroniques de commutation (interrupteurs) ii) de stockage de l'énergie électrique (inductances, condensateurs). La conversion est effectuée en stockant l'énergie de la source durant une partie de la période de fonctionnement (d'horloge), puis transférée vers la charge pendant le reste de la période d'horloge; et ce graçe à une commande adéquate appliquée au niveau des interrupteurs. Afin d'assurer les performances désirées de ce transfert, un modèle mathématique du convertisseur permettant la synthèse du contrôleur est nécessaire. Parmi les modèles présentés [Gue, 06b], [Gue, 06c]. Structure du mémoire Ce mémoire comporte quatre chapitres : Dans le premier chapitre, nous introduisons le convertisseur statique ainsi que les principes de base pour l'analyse de son comportement. Ensuite, les différentes techniques de modélisation de ce système seront présentées avec leurs propriétés ainsi que leurs limites respectives. Afin de mieux appréhender les comportements non linéaires du convertisseur, quelques outils d'analyse nécessaires seront rappelés à la fin de ce chapitre. Dans le second chapitre, on s'intéressera à la technique de modélisation discrète des convertisseurs. Deux techniques largement utilisées dans la littérature [Ban, 01], [Tse, 03], seront analysées. Ensuite à partir de leurs inconvénients et de leurs limites, nous proposons d'introduire
Proceedings of the 48h IEEE Conference on Decision and Control (CDC) held jointly with 2009 28th Chinese Control Conference, 2009
Controlling DC-DC power converters is to provide better performance and to ensure the system clos... more Controlling DC-DC power converters is to provide better performance and to ensure the system closed loop stability. Using a simplified averaged model of the converter we propose, in this paper, a design approach of a fuzzy PID. Unlike classical design approach of fuzzy controllers, we choose in our case to fix the controller gains according to the system stability requirements. The proposed approach is also used to make stability maps in the converter-controller parameters space. Validation of the fuzzy logic controller design approach and illustration of its efficiency is done through simulations.
International Journal of Computer and Electrical Engineering, 2014
The minimum variance principle is, generally, used for controller's synthesis. In this paper, we ... more The minimum variance principle is, generally, used for controller's synthesis. In this paper, we propose another use of this principle to identify the hysteresis property of piezoelectric actuators using the Extended Least Squares identification technique adapted for the ARMAX model.
L\u27objectif de cet article est de démontrer la possibilité de faire osciller à 1.6 µm un amplif... more L\u27objectif de cet article est de démontrer la possibilité de faire osciller à 1.6 µm un amplificateur à fibre double gaine dopée erbium opérant dans la bande C, en ajustant les pertes intra-cavité. Deux configurations de cavité ont été utilisées, une cavité en anneau et une cavité en forme de huit. Dans les deux cas, il est possible d\u27obtenir l\u27oscillation à 1.6 µm en continu ou bien en impulsions ultra-courtes
International Journal of Automation and Computing, 2016
The paper deals with the problem of switched dynamical systems modeling especially in DC-DC conve... more The paper deals with the problem of switched dynamical systems modeling especially in DC-DC converters case study consideration. It presents two approaches to describe accurately the behavior of this class of systems. To clarify the paper s contribution, the proposed approaches are validated through simulations and experimental results. A comparative study, between the obtained results and those of other techniques from the literature, is given to evaluate the performances of the studied approaches.
DC-DC converters are nonlinear systems that exhibit a complicated nonlinear phenomena, its modell... more DC-DC converters are nonlinear systems that exhibit a complicated nonlinear phenomena, its modelling presents the basic step of its analysis and control. In this work, we propose a discrete modelling technique that allows an accurate description of the converter behaviour with a minimum of simplifying assumptions and validity hypothesis. The proposed method validation is achieved by means of simulation and a comparative study results.
Controlling DCDC power converters is to provide better performance and to ensure the system close... more Controlling DCDC power converters is to provide better performance and to ensure the system closed loop stability. Using a simplified averaged model of the converter we propose, in this paper, a design approach of a fuzzy PID. Unlike classical design approach of fuzzy controllers, we choose in our case to fix the controller gains according to the system stability requirements. The proposed approach is also used to make stability maps in the convertercontroller par ameters space. Validation of the fuzzy logic controller design approach and illustration of its efficiency is done through simulations.
DC-DC power converters are characterized by cyclic switching of circuit configurations, which giv... more DC-DC power converters are characterized by cyclic switching of circuit configurations, which gives rise to a variety of nonlinear behaviors. Their occurrence in DC-DC power converters makes the system analysis, control and behavior prediction difficult. An enhanced modeling method allowing obtaining an accurate description of the converter behavior is presented in this paper. The principal of ramp compensation is introduced and dynamical compensation ramp is proposed to both suppress converter nonlinear phenomena and ensure the peak current regulation for a wide range of reference variation.
DC-DC power converters are characterized by cyclic switching of circuit configurations, which giv... more DC-DC power converters are characterized by cyclic switching of circuit configurations, which gives rise to a variety of nonlinear behaviors. Their occurrence in DC-DC power converters makes the system analysis, control and behavior prediction difficult. An enhanced modeling method allowing obtaining an accurate description of the converter behavior is presented in this paper. The principal of ramp compensation is introduced and dynamical compensation ramp is proposed to both suppress converter nonlinear phenomena and ensure the peak current regulation for a wide range of reference variation.
In order to meet the requirements of harmonic elimination and reactive power compensation in subs... more In order to meet the requirements of harmonic elimination and reactive power compensation in substation, a three level four leg shunt active filter is proposed in this paper. The use of three-level converters allows a better performance of the equipment, by reducing harmonics and the ripple of the generated voltages and currents. The compensation algorithm is based on pqr theory. This scheme requires the service of a phased-locked loop (PLL) to make the system insensitive to the distortions that are generally present in the utility voltages. The control system is implemented numerically using Matlab/Simulink tool. The performance of the proposed control approach is finally discussed through the obtained simulation results.
Proceedings of the 48h IEEE Conference on Decision and Control (CDC) held jointly with 2009 28th Chinese Control Conference, 2009
Controlling DC-DC power converters is to provide better performance and to ensure the system clos... more Controlling DC-DC power converters is to provide better performance and to ensure the system closed loop stability. Using a simplified averaged model of the converter we propose, in this paper, a design approach of a fuzzy PID. Unlike classical design approach of fuzzy controllers, we choose in our case to fix the controller gains according to the system stability requirements. The proposed approach is also used to make stability maps in the converter-controller parameters space. Validation of the fuzzy logic controller design approach and illustration of its efficiency is done through simulations.
Grâce aux performances accrues des convertisseurs statiques, de nouveaux champs d'application se ... more Grâce aux performances accrues des convertisseurs statiques, de nouveaux champs d'application se sont ouverts. Certains d'entre eux sont très exigeants en termes de performances dynamiques. Nous pouvons citer comme exemples la dépollution de réseaux électriques, l'alimentation de machines à courant alternatif pour des applications particulières, l'amplification de puissance (audio…). Pour de telles applications, il faudrait un convertisseur idéal, qui génèrerait une tension (ou un courant) de sortie rigoureusement identique à un signal de référence, à un facteur de proportionnalité près, y compris lorsque ce signal varie rapidement. Le transfert d'énergie entre la source et le récepteur serait alors idéalement contrôlé, la plage de fonctionnement serait la plus large possible sans entraîner l'apparition de phénomènes subharmoniques ou chaotiques. Pour cela, il faudrait être en mesure d'abord d'identifier, grâce à une modélisation adéquate, ces phénomènes indésirables. Ensuite, il est nécessaire d'optimiser la stratégie de commande, de manière à assurer une poursuite du signal de référence la meilleure possible, pour un convertisseur donné, commutant à une fréquence imposée par des limitations technologiques. Dans ce cadre que s'inscrit notre contribution dans ce travail de thèse. Un convertisseur statique de base est formé essentiellement de deux types de composants : i) électroniques de commutation (interrupteurs) ii) de stockage de l'énergie électrique (inductances, condensateurs). La conversion est effectuée en stockant l'énergie de la source durant une partie de la période de fonctionnement (d'horloge), puis transférée vers la charge pendant le reste de la période d'horloge; et ce graçe à une commande adéquate appliquée au niveau des interrupteurs. Afin d'assurer les performances désirées de ce transfert, un modèle mathématique du convertisseur permettant la synthèse du contrôleur est nécessaire. Parmi les modèles présentés [Gue, 06b], [Gue, 06c]. Structure du mémoire Ce mémoire comporte quatre chapitres : Dans le premier chapitre, nous introduisons le convertisseur statique ainsi que les principes de base pour l'analyse de son comportement. Ensuite, les différentes techniques de modélisation de ce système seront présentées avec leurs propriétés ainsi que leurs limites respectives. Afin de mieux appréhender les comportements non linéaires du convertisseur, quelques outils d'analyse nécessaires seront rappelés à la fin de ce chapitre. Dans le second chapitre, on s'intéressera à la technique de modélisation discrète des convertisseurs. Deux techniques largement utilisées dans la littérature [Ban, 01], [Tse, 03], seront analysées. Ensuite à partir de leurs inconvénients et de leurs limites, nous proposons d'introduire
Proceedings of the 48h IEEE Conference on Decision and Control (CDC) held jointly with 2009 28th Chinese Control Conference, 2009
Controlling DC-DC power converters is to provide better performance and to ensure the system clos... more Controlling DC-DC power converters is to provide better performance and to ensure the system closed loop stability. Using a simplified averaged model of the converter we propose, in this paper, a design approach of a fuzzy PID. Unlike classical design approach of fuzzy controllers, we choose in our case to fix the controller gains according to the system stability requirements. The proposed approach is also used to make stability maps in the converter-controller parameters space. Validation of the fuzzy logic controller design approach and illustration of its efficiency is done through simulations.
International Journal of Computer and Electrical Engineering, 2014
The minimum variance principle is, generally, used for controller's synthesis. In this paper, we ... more The minimum variance principle is, generally, used for controller's synthesis. In this paper, we propose another use of this principle to identify the hysteresis property of piezoelectric actuators using the Extended Least Squares identification technique adapted for the ARMAX model.
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Papers by Kamel Guesmi