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You searched for subject:(analyse de contingence). Showing records 1 – 2 of 2 total matches.

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EPFL

1. Barben, Raphaël. Vulnerability Assessment of Electric Power Supply under Extreme Weather Conditions.

Degree: 2010, EPFL

This thesis analyses and models the vulnerability of the electricity power supply under extreme weather conditions. The system under study is the electric supply system that includes major power plants to main load centers. Extreme weather conditions can cause common mode contingencies (CMCs) of overhead power lines, which endanger the security of electricity supply. Planning and operation of transmission systems are subject to N-1 criterion, which requires that all single failures of network elements do not cause a breach of safety limits. This criterion does not guarantee the security of electricity supply at the time of extreme weather conditions. The objective of this research is to identify critical and plausible CMCs, taking into account space-time correlations of extreme weather conditions and possible states of the network. The most vulnerable zones are focused on to determine appropriate countermeasures for reducing vulnerability. In the past, extreme weather events have caused major disruptions. For example, the blackout in New York in 1977 was initiated by three impacts of lightning on high voltage lines. In 1999, hurricane Lothar caused damage to power grids in several countries, leaving hundreds of thousands of people in darkness. These examples demonstrate the vulnerability of power systems to CMCs. Current transmission networks are expected to undergo significant changes in response to developments such as increases in consumption and newly installed capacity. These changes provide an opportunity to strengthen the security of electricity supply in the perspective of extreme weather conditions and even improve the resilience of electric supply systems. The use of the proposed methodology allows reducing the level of vulnerability by reinforcing only few points or change of the topology of the network. Faced with uncertainties about the evolution of networks and plausible extreme weather conditions, a methodology based on scenarios has been selected. The methodology allows the modeler to reproduce the complexity of the problem while still encouraging the learning process. The core of the methodology is founded on a scenario of electric supply systems and a scenario of extreme weather events. The first scenario includes three models: electric, geographic, and reliability. The electric model comprises components of the network compatible with load flow calculations. The geographic model contains a representation of each power line in a geographic information system, and each of these lines is divided into segments that are associated with a reliability model. The reliability model evaluates failure rates related to exposure to extreme weather conditions. Scenarios of extreme weather events are built on data from weather stations or by… Advisors/Committee Members: Gnansounou, Edgar.

Subjects/Keywords: vulnerability analysis; extreme weather conditions; electricity power supply; contingency analysis; geographic information system; analyse de vulnérabilité; conditions météorologiques extrêmes; système d'approvisionnement en électricité; analyse de contingence; système d'information géographique

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Barben, R. (2010). Vulnerability Assessment of Electric Power Supply under Extreme Weather Conditions. (Thesis). EPFL. Retrieved from http://infoscience.epfl.ch/record/151998

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Barben, Raphaël. “Vulnerability Assessment of Electric Power Supply under Extreme Weather Conditions.” 2010. Thesis, EPFL. Accessed October 16, 2018. http://infoscience.epfl.ch/record/151998.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Barben, Raphaël. “Vulnerability Assessment of Electric Power Supply under Extreme Weather Conditions.” 2010. Web. 16 Oct 2018.

Vancouver:

Barben R. Vulnerability Assessment of Electric Power Supply under Extreme Weather Conditions. [Internet] [Thesis]. EPFL; 2010. [cited 2018 Oct 16]. Available from: http://infoscience.epfl.ch/record/151998.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Barben R. Vulnerability Assessment of Electric Power Supply under Extreme Weather Conditions. [Thesis]. EPFL; 2010. Available from: http://infoscience.epfl.ch/record/151998

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

2. Bennabi, Zouaoui Sid-Ahmed Amine. Facteurs de contingence dans la mesure de satisfaction clients : Contingency factors in customer satisfaction survey.

Degree: Docteur es, Sciences de gestion, 2013, Université Paris X – Nanterre

Si au cours des vingt dernières années la pratique en matière de mesure barométrique de la satisfaction clients s’est largement développée auprès des entreprises, la fiabilité des indicateurs de performance issus de ces mesures n’est pas forcément maitrisée. La satisfaction comme indicateur de performance est aujourd’hui admise par les managers, néanmoins son utilisation au quotidien pose quelques questions, notamment celle qui touche la capacité des indicateurs produit à partir de la mesure barométrique d’évaluer fidèlement la performance. La question théorique que nous traitons dans cette thèse concerne l’étude de la représentativité et de la sensibilité des indicateurs de satisfaction face à l’existence de certaines sources exogènes (facteurs sociodémographique et géographique) que nous avons qualifiées de facteurs de contingence. Notre recherche repose sur l’examen des indicateurs de satisfaction lorsque ces derniers sont utilisés comme des instruments de comparaison entre magasins : d’un point de vue transversal (comparaison entre unité de gestion) et d’un autre longitudinale (l’évolution dans le temps des indicateurs). Par le biais de trois propositions, nous avons confronté une série de facteurs de contingence au fonctionnement des indicateurs satisfaction afin de connaitre si les indicateurs remplissent bien leurs rôles. Pour arriver aux résultats, un cadre théorique explicatif de l’action des facteurs de contingence et des analyses statistiques basées sur les procédures bayésiennes pour le calcul de l’importance ont été mis en place. Les données d’analyse sont issues de deux baromètres de satisfaction. Les cumuls en termes d’individus interrogés dans chaque baromètre sont de 175000 individus pour le premier et de 40000 individus pour chaque trimestre (16 trimestres sont disponibles) pour le second. Les conclusions de nos travaux pointent la défaillance de l’indicateur de satisfaction issu des baromètres à concorder avec les exigences des instruments de contrôle de performance. Le tout avec des actions importantes des facteurs de contingence type géographique.

Even if during the last twenty years the practice of barometric measurement of customer satisfaction has developed significantly among companies, the reliability of performance indicators derived from these measures has not necessarily been mastered. Satisfaction as a performance indicator is now accepted by managers however, its everyday use poses some issues, including those affecting the ability of barometric indicators to accurately assess performance. The theoretical question we address in this thesis is the study of the representation and the sensitivity of indicators of satisfaction which are affected by the existence of certain exogenous sources (demographic and geographic factors), which we refer to as contingency factors. Our research is based on the review of indicators of satisfaction when they are used as instruments for comparing shops: on a transverse view (comparison between management units) and another longitudinal view (changes in…

Advisors/Committee Members: Benavent, Christophe (thesis director).

Subjects/Keywords: Satisfaction clients; Indicateur de perforamnce; Analyse bayesienne; Facteurs de contingence; Baromètre; Modèles multi-niveaux; Customer satidfaction survey; Performance indicators; Analysis; Contingency factors; Multilevel; Barometer; 650

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Bennabi, Z. S. A. (2013). Facteurs de contingence dans la mesure de satisfaction clients : Contingency factors in customer satisfaction survey. (Doctoral Dissertation). Université Paris X – Nanterre. Retrieved from http://www.theses.fr/2013PA100098

Chicago Manual of Style (16th Edition):

Bennabi, Zouaoui Sid-Ahmed Amine. “Facteurs de contingence dans la mesure de satisfaction clients : Contingency factors in customer satisfaction survey.” 2013. Doctoral Dissertation, Université Paris X – Nanterre. Accessed October 16, 2018. http://www.theses.fr/2013PA100098.

MLA Handbook (7th Edition):

Bennabi, Zouaoui Sid-Ahmed Amine. “Facteurs de contingence dans la mesure de satisfaction clients : Contingency factors in customer satisfaction survey.” 2013. Web. 16 Oct 2018.

Vancouver:

Bennabi ZSA. Facteurs de contingence dans la mesure de satisfaction clients : Contingency factors in customer satisfaction survey. [Internet] [Doctoral dissertation]. Université Paris X – Nanterre; 2013. [cited 2018 Oct 16]. Available from: http://www.theses.fr/2013PA100098.

Council of Science Editors:

Bennabi ZSA. Facteurs de contingence dans la mesure de satisfaction clients : Contingency factors in customer satisfaction survey. [Doctoral Dissertation]. Université Paris X – Nanterre; 2013. Available from: http://www.theses.fr/2013PA100098

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