2 résultat(s) recherche sur le tag '????? ???????? ?????'    

Amélioration de la qualité du réseau electrique à l’aide de compensateurs actifs / Noureddine Hamouda  

Public ISBD Titre : Amélioration de la qualité du réseau electrique à l’aide de compensateurs actifs Type de document : texte imprimé Auteurs : Noureddine Hamouda, Auteur ; Hocine Benalla, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 227 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles Langues : Français (fre) Tags : pollution harmonique  FAP  FMV  filtrage actif globale  filtrage actif sélectif  système éolien  harmonic pollution  APF  MVF  global active filter  selective active filter  wind system  PMSG  ??????? ?????????  ?????? ??????  ???? ????? ????????  ????? ???????? ?????  ???? ???? ??????  ????? ????? ???? Index. décimale : 622 Electro-Technique Résumé : This thesis falls within the framework of harmonic depollution of the low voltage electrical networks using an active power compensators, this pollution is caused by the unlimited use of non-linear loads. The causes, the effects of these harmonic disturbances and the international standards imposed to protect the consumers against these disturbances are presented. Also, several traditional and modern solutions against the harmonic pollution are presented. We have focused our study on the development of the control techniques of shunt active power filter, For this reason, we have based on the development of methods for determining harmonic reference currents based on a multivariable filter (MVF), These new methods are able to correctly extract the reference harmonic currents necessary to control the SAPF, after that, we have implemented the modified (p-q) method on the power active filter in order to carry out a global active compensation of the harmonics currents, the behavior and quality of filtering of the APF are evaluated with two kinds of electric loads, with different types of electrical network and with a photovoltaic power source. Then, we have developed two harmonic selective identification methods based on multivariable filter, which are implemented in real time, in order to realise a selective active compensation of specific harmonic currents under low DC link voltage, this work was closed by an experimental validation of an active power filter (APF) fed by a PMSG-based wind system, for this we implemented three controllers to control this system, which are the predictive current controller, Type-2 fuzzy logic controller, and an ANFIS controller. The experimental results obtained show that this system is capable of compensating for harmonics and reactive power, and also injected active power into the electrical network. Diplôme : Doctorat en sciences En ligne : ../theses/electrotec/HAM7313.pdf Format de la ressource électronique : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10929 Amélioration de la qualité du réseau electrique à l’aide de compensateurs actifs [texte imprimé] / Noureddine Hamouda, Auteur ; Hocine Benalla, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2018 . - 227 f. ; 30 cm. 2 copies imprimées disponibles Langues : Français (fre) Tags : pollution harmonique  FAP  FMV  filtrage actif globale  filtrage actif sélectif  système éolien  harmonic pollution  APF  MVF  global active filter  selective active filter  wind system  PMSG  ??????? ?????????  ?????? ??????  ???? ????? ????????  ????? ???????? ?????  ???? ???? ??????  ????? ????? ???? Index. décimale : 622 Electro-Technique Résumé : This thesis falls within the framework of harmonic depollution of the low voltage electrical networks using an active power compensators, this pollution is caused by the unlimited use of non-linear loads. The causes, the effects of these harmonic disturbances and the international standards imposed to protect the consumers against these disturbances are presented. Also, several traditional and modern solutions against the harmonic pollution are presented. We have focused our study on the development of the control techniques of shunt active power filter, For this reason, we have based on the development of methods for determining harmonic reference currents based on a multivariable filter (MVF), These new methods are able to correctly extract the reference harmonic currents necessary to control the SAPF, after that, we have implemented the modified (p-q) method on the power active filter in order to carry out a global active compensation of the harmonics currents, the behavior and quality of filtering of the APF are evaluated with two kinds of electric loads, with different types of electrical network and with a photovoltaic power source. Then, we have developed two harmonic selective identification methods based on multivariable filter, which are implemented in real time, in order to realise a selective active compensation of specific harmonic currents under low DC link voltage, this work was closed by an experimental validation of an active power filter (APF) fed by a PMSG-based wind system, for this we implemented three controllers to control this system, which are the predictive current controller, Type-2 fuzzy logic controller, and an ANFIS controller. The experimental results obtained show that this system is capable of compensating for harmonics and reactive power, and also injected active power into the electrical network. Diplôme : Doctorat en sciences En ligne : ../theses/electrotec/HAM7313.pdf Format de la ressource électronique : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10929

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

Quelques problËmes en relativité et cosmologie / Amine Benachour  

Public ISBD Titre : Quelques problËmes en relativité et cosmologie : Théorie d’einstein-cartan comme alternative au problème de la matière sombre, théorie F(R) et transformation de Lorentz à l’échelle macroscopique Type de document : texte imprimé Auteurs : Amine Benachour, Auteur ; Sami Ryad Zouzou, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 98 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles Langues : Français (fre) Tags : Einstein-Cartan theory  Spherical symmetry  Exact solutions  Mass formula  Dark matter  f(R) theory  Ricci scalar  Common solutions  Lorentz transformation  Length contraction  Thought experiment  Tape measure  Simultaneity  Macroscopic scale  Théorie d’Einstein-Cartan  Symétrie sphérique  Solutions exactes  Formule de masse  Matière sombre  Théorie f(R)  Scalaire de Ricci  Solutions communes  Transformation de Lorentz  Contraction des longueurs  Expérience de pensée  Mètre ruban  Simultanéité  Echelle macroscopique  ????? ???????? ?????  ????? ????  ???? ?????????  ????? ??????  ?????? ???????  ????? f(R)  ???? ????????  ???? ??????  ????? ?????  ???? ???????  ???? ????  ????? Index. décimale : 530 Physique Résumé : Some current issues in cosmology lead us to consider theories of gravitation other than general relativity. It is in this context that this thesis is being taken by considering first the Einstein-Cartan theory for static and spherically symmetric spacetime where obtaining exact solutions has led to a general formula linking the internal mass of an object with spherical symmetry to its external mass, highlighting a difference in mass that would likely to provide an explanation for the dark matter problem in the universe. Another theory of gravitation which has been studied in this thesis often proposed as an alternative to the problem of dark energy; is the f(R) theory where the emphasis has been placed on its close link with general relativity by demonstrating the necessary and sufficient condition for a metric to be a solution of the two theories; whose consequences made possible the construction of f(R) theories equivalent to general relativity for a specific form of the Ricci scalar; and set the conditions on the parameters of a given model to have such equivalence. Finally, following the analysis of a thought experiment involving the measurement of the distance between two observers in motion by a tape measure, certain problems related to the application of the Lorentz transformation at the macroscopic scale have also been investigated and solved. Diplôme : Doctorat en sciences En ligne : ../theses/physique/BEN7376.pdf Format de la ressource électronique : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11025 Quelques problËmes en relativité et cosmologie : Théorie d’einstein-cartan comme alternative au problème de la matière sombre, théorie F(R) et transformation de Lorentz à l’échelle macroscopique [texte imprimé] / Amine Benachour, Auteur ; Sami Ryad Zouzou, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2018 . - 98 f. ; 30 cm. 2 copies imprimées disponibles Langues : Français (fre) Tags : Einstein-Cartan theory  Spherical symmetry  Exact solutions  Mass formula  Dark matter  f(R) theory  Ricci scalar  Common solutions  Lorentz transformation  Length contraction  Thought experiment  Tape measure  Simultaneity  Macroscopic scale  Théorie d’Einstein-Cartan  Symétrie sphérique  Solutions exactes  Formule de masse  Matière sombre  Théorie f(R)  Scalaire de Ricci  Solutions communes  Transformation de Lorentz  Contraction des longueurs  Expérience de pensée  Mètre ruban  Simultanéité  Echelle macroscopique  ????? ???????? ?????  ????? ????  ???? ?????????  ????? ??????  ?????? ???????  ????? f(R)  ???? ????????  ???? ??????  ????? ?????  ???? ???????  ???? ????  ????? Index. décimale : 530 Physique Résumé : Some current issues in cosmology lead us to consider theories of gravitation other than general relativity. It is in this context that this thesis is being taken by considering first the Einstein-Cartan theory for static and spherically symmetric spacetime where obtaining exact solutions has led to a general formula linking the internal mass of an object with spherical symmetry to its external mass, highlighting a difference in mass that would likely to provide an explanation for the dark matter problem in the universe. Another theory of gravitation which has been studied in this thesis often proposed as an alternative to the problem of dark energy; is the f(R) theory where the emphasis has been placed on its close link with general relativity by demonstrating the necessary and sufficient condition for a metric to be a solution of the two theories; whose consequences made possible the construction of f(R) theories equivalent to general relativity for a specific form of the Ricci scalar; and set the conditions on the parameters of a given model to have such equivalence. Finally, following the analysis of a thought experiment involving the measurement of the distance between two observers in motion by a tape measure, certain problems related to the application of the Lorentz transformation at the macroscopic scale have also been investigated and solved. Diplôme : Doctorat en sciences En ligne : ../theses/physique/BEN7376.pdf Format de la ressource électronique : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11025

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire