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See detailVoltage Stability Monitoring, Instability Detection and Control
Glavic, Mevludin ULiege; Novosel, Damir

Learning material (2011)

Voltage stability refers to the ability of a power system to maintain steady voltages at all buses in the system after being subjected to a disturbance from a given initial operating condition [1 ... [more ▼]

Voltage stability refers to the ability of a power system to maintain steady voltages at all buses in the system after being subjected to a disturbance from a given initial operating condition [1]. Principal causes of voltage instability are [1-5]: heavy load system operation conditions, long distances between generation and load, low source voltages, and insufficient reactive power compensation. The degree of a system voltage stability (the proximity to voltage instability) is strongly influenced by system conditions and its characteristics such as: generation system characteristics (in particular excitation systems), load characteristics, reactive power compensation devices characteristics, voltage control devices, presence of under load tap changing (ULTC) transformers , etc.[4]. Usually, in a voltage unstable situation, the voltage magnitudes in some system buses undergo, generally monotonic, decrease in the seconds or minutes following a disturbance. When pronounced, this decrease might endanger the system integrity mainly due to protecting devices that trip generation, transmission, or load equipment leading eventually to a blackout in the form of a voltage collapse [2], [3]. Voltage collapse is defined as the process by which the sequence of events accompanying voltage instability leads to a blackout or abnormally low voltages in a significant part of the power system [1]. Voltage instability is considered as a mayor treat for secure power system operation in many power systems throughout the world. Taking advantages of existing technological solutions, such as synchronized phasor measurements, powerful computational facilities, networking infrastructure and communications, in order to monitor stability conditions and control detected instability are of paramount importance. Wide area monitoring, protection, and control systems open perspectives for effective solution of this problem [6]. [less ▲]

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See detailVoltage Stability of Electric Power Systems
Van Cutsem, Thierry ULiege; Vournas, Costas

Book published by Springer (previously Kluwer Academic Publishers) (1998)

Detailed reference viewed: 429 (17 ULiège)
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See detailVoltaire as a playwright, an off-centered strategy?
Daubercies, Laurence ULiege

Conference (2015, March 21)

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See detailVoltaire et l'édition liégeoise jusqu'en 1765
Droixhe, Daniel ULiege; Gérard, M-Fr

in Droixhe, Daniel; Gossiaux, Pol-Pierre; Hasquin, H. (Eds.) et al Livres et Lumières au pays de Liège (1980)

Detailed reference viewed: 22 (1 ULiège)
See detailVoltaire et l’Optimisme. Candide aujourd’hui
Tilkin, Françoise ULiege

Conference given outside the academic context (2009)

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See detailVoltaire et la conception sartrienne de l'engagement
Denis, Benoît ULiege

Conference (2000)

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See detailVoltaire et la dramaturgie des marges. Analyse socio-géographique d'un parcours auctorial
Daubercies, Laurence ULiege

in Cahiers Voltaire : Revue Annuelle de la Société Voltaire (2014)

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See detailVoltaire et la périphérie - Le cas "Mahomet" (1741-1742)
Daubercies, Laurence ULiege

Conference (2014, April 12)

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See detailVoltaire et la Révolution
Tilkin, Françoise ULiege

Scientific conference (2013, October 22)

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See detailVoltaire et le livre
Tilkin, Françoise ULiege; Bessire, François

Book published by Centre international d'étude du XVIIIe siècle (2009)

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See detailVoltaire et les débuts du Journal encyclopédique. Une collaboration médiatique sous contrôle
Droixhe, Daniel ULiege

in Tilkin, Françoise (Ed.) L'encyclopédisme au XVIIIe siècle. Actes du Colloque organisé par le Groupe d'étude du XVIIIe siècle de l'Université de Liège (Liège, 30-31 octobre 2006) (2008)

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See detailVoltaire, le Traité sur la tolérance
Tilkin, Françoise ULiege

Scientific conference (2009, February 02)

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See detailVoltaire, Zaïre, (éd. Pierre Frantz)
Daubercies, Laurence ULiege

in Revue Voltaire (2017)

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See detailVolume and Displacement Indicators For Tubes And Profiles
Samyn, Philippe; Latteur, Pierre ULiege

(2000)

Detailed reference viewed: 27 (0 ULiège)
See detailVolume jubilaire Louis d’Or
Swings, Polydore ULiege; Mignolet, Joseph C.-P.

Book published by Société Royale des Sciences de Liège (1971)

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See detailThe volume of blood for epidural blood patch in obstetrics: a randomized, blinded clinical trial
Paech, M. J.; Doherty, D. A.; Christmas, T. et al

in Anesthesia and Analgesia (2011), 113(1), 126-33

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See detailVolume of Structures : Application to Classical and Harmonic Structures
Samyn, Philippe; Latteur, Pierre ULiege; Van Vooren, J.

(1998, September)

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See detailVolume phase holographic gratings: large size and high diffraction efficiency
Blanche, Pierre-Alexandre ULiege; Gailly, Patrick ULiege; Habraken, Serge ULiege et al

in Optical Engineering (2004), 43(11), 2603-2612

Volume phase holographic gratings (VPHGs) possess unique properties that make them attractive for numerous applications. After reviewing major VPHG characteristics through theory, we discuss some aspects ... [more ▼]

Volume phase holographic gratings (VPHGs) possess unique properties that make them attractive for numerous applications. After reviewing major VPHG characteristics through theory, we discuss some aspects of the dichromated gelatin recording material and the holographic recording process. The large-scale VPHG research facility set up at the Center Spatial de Liege enables production of VPHGs up to 380 mm in diameter, with fringe frequencies from 315 to 3300 Ip/mm. We describe the work that has been undertaken in our laboratory to remove the last limitations inherent in VPHGs. (C) 2004 Society of Photo-Optical Instrumentation Engineers. [less ▲]

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