By Jose Ma Sierra-Fernández, Juan José González de la Rosa, José Carlos Palomares-Salas (auth.), Matías Liñán Reyes, José M. Flores Arias, Juan J. González de la Rosa, Josef Langer, Francisco J. Bellido Outeiriño, Antonio Moreno-Munñoz (eds.)
This e-book constitutes the refereed court cases of the three rd overseas ICST convention on IT Revolutions, held in Cordoba, Spain in March 2011. The 20 revised complete papers awarded have been conscientiously reviewed and chosen from a number of submissions. they're grouped in topical sections on eGreen strength, clever structures, future health and ambient assisted residing, shrewdpermanent environments and person adventure, grid and cloud computing, eLearning.
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Extra info for IT Revolutions: Third International ICST Conference, Córdoba, Spain, March 23-25, 2011, Revised Selected Papers
Sample text
It has been proved that the 85% of power supply malfunctions attributed to poor PQ are caused by sags of fewer than one second duration. Comparing with dips, sags affect more customers and may cause grave problems, creating problems to sensitive systems which operate within narrow voltage ranges, or do not have adequate filtering elements. On the other hand, under operating conditions of a power system there is risk of damaging due to a momentary excess of voltage. Although by themselves they would be abnormal, it is possible to distinguish between surges and swells.
And steady state disturbances (harmonic distortion, unbalance, flicker…) [2]. The quality of the power supply delivered by utilities varies considerably and depends on a number of external factors. Things like lightning, industrial premises which apply and remove large loads, non-lineal load stresses, inadequate or incorrect wiring and grounding or short circuits caused by animals, branches, vehicular impact and human accidents involving electric lines. With the generalized use of PLCs, adjustable-speed drives (ASDs), computers and other susceptible devices, the subject related to power quality and its relationship to vulnerability of highly automated plants is becoming an increasing concern to the industry.
The need for line voltage regulation still remains a necessity to meet demands for high industrial productivity. There are several conditioning solutions to voltage regulation, which are currently available in the market place. Among the most common are Un-interruptible Power Supply systems, (UPS). Recently, new technologies like custom power devices based on power electronics concepts have been developed to provide protection against PQ problems. Instrumentation and control operation require high quality and ultra-reliable power in the quantities and time frames that have not been experienced before.