Time filter

Source Type

Irvine, CA, United States

Debnath U.K.,Edith Cowan University | Ahmad I.,Edith Cowan University | Habibi D.,Edith Cowan University | Yousuf Saber A.,ETAP
IEEE Systems Journal | Year: 2015

The intermittent nature of renewable energy sources (RESs) and unpredictable load demands are two major challenges in providing uninterrupted power supply from a smart grid. One way to address these challenges is to use storage devices that can store surplus energy from RESs and discharge the energy back to the grid when needed. Researchers have recently introduced the idea to use electric vehicles with vehicle-to-grid capability, which are called 'gridable vehicles' (GVs), as storage devices in the smart grid. Using GVs as loads is well accepted, but as sources, they disrupt system reliability if insufficient GVs are available for discharging when needed. An availability planning model is thus required to address this issue. GV owners' concern over battery lifetime reductions is another issue that impedes the required participation rates for GVs in vehicle-to-grid discharge programs. In this paper, we present an intelligent smart grid system model, which mitigates real-time unavailability of GV sources via an availability planning model. We also propose a GV selection model that prevents GV batteries from premature expiry due to their vehicle-to-grid operations. Simulation results confirm that our proposed models maintain better overall reliability and increase average battery lifetime by up to 3.5 years compared with existing vehicle-to-grid models. © 2007-2012 IEEE. Source

Khomsi S.,CNRS Georesources lab | Khomsi S.,King Abdulaziz University | Echihi O.,ETAP | Slimani N.,Institute National Agronomique Of Tunis
Comptes Rendus - Geoscience | Year: 2012

A set of different data including high resolution seismic sections, petroleum wire-logging well data, borehole piezometry, structural cross-sections and outcrop analysis allowed us to characterise the tectonic framework, and its relationships with the deep aquifers seated in Cretaceous-Miocene deep reservoirs. The structural framework, based on major structures, controls the occurrence of deep aquifers and sub-basin aquifer distributions. Five structural domains can be defined, having different morphostructural characteristics. The northernmost domain lying on the north-south axis and Zaghouan thrust system is a domain of recharge by underflow of the different subsurface reservoirs and aquifers from outcrops of highly fractured reservoirs. On the other hand, the morphostructural configuration controls the piezometry of underground flows in the Plio-Quaternary unconfined aquifer. In the subsurface the Late Cretaceous-Miocene reservoirs are widespread with high thicknesses in many places and high porosities and connectivities especially along major fault corridors and on the crestal parts of major anticlines. Among all reservoirs, the Oligo-Miocene, detritic series are widespread and present high cumulative thicknesses. Subsurface and fieldwork outline the occurrence of 10 fractured sandy reservoirs for these series with packages having high hydrodynamic and petrophysical characteristics. These series show low salinities (maximum 5. g/l) in the northern part of the study area and will constitute an important source of drinkable water for the next generations. A regional structural cross-section is presented, compiled from all the different data sets, allowing us to define the major characteristics of the hydrogeological-hydrogeothermal sub-basins. Eight hydrogeological provinces are defined from north-west to south-east. A major thermal anomaly is clearly identified in the south-eastern part of the study area in Sfax-Sidi Il Itayem. This anomaly is possibly related to major faults pertaining to the Sirt basin and controlled by a deep thermal anomaly. Many exploration targets are identified especially along the Cherichira-Kondar thrust where the Oligocene subcropping reservoirs are well developed. They are highly fractured and show good hydrodynamic characteristics. © 2012 Académie des sciences. Source

Soua M.,ETAP
75th European Association of Geoscientists and Engineers Conference and Exhibition 2013 Incorporating SPE EUROPEC 2013: Changing Frontiers | Year: 2013

In summary, several black shales levels were described within the late Hauterivian sections from different domains of Tunisia, notably the NE and SE. For this purpose, geophysical borehole log tools are used here (spectral Gamma ray, Uranium, Thorium, Th/U ratio) in order to characterize better the Faraoni event in Tunisia. In addition, the Khanguet Aicha section (northern Chott basin) has been studied for its magnetic susceptibility and carbonate content. In Gulf of Gabes the late Hauterivian section displays high organic carbon contents of up to 1.8% with significant oil prone source potential of up to 8.3 kg/ton. In the Gulf of Tunis, the Faraoni Level appears to be represented by three to four laminated black shale levels within pelagic mudstones and wackestones of the M'cherga Formation. In the Khanguet Aicha Section, the Faraoni Level is expressed by 2m-thick laminated shales within a carbonate, siltstone and marls succession. In summary, this study consists also of magnetic susptibility analysis (SM), Sequence stratigraphic and biostratigraphic constraints presenting published and umpublished data. Copyright © (2012) by the European Association of Geoscientists & Engineers All rights reserved. Source

Mitolo M.,Eaton Corporation | Freschi F.,Polytechnic University of Turin | Liu H.,ETAP | Tartaglia M.,Polytechnic University of Turin
IEEE Industry Applications Magazine | Year: 2014

In low-voltage systems, ground faults do not necessarily involve the actual earth, but fault currents may return to the source via conductors. Such conductors, which provide a clear path toward the source, are defined in the applicable codes and technical standards as equipment grounding conductors or protective conductors. © 2014 IEEE. Source

Mitolo M.,Eaton Corporation | Liu H.,ETAP
IEEE IAS Electrical Safety Workshop | Year: 2015

The touch voltage analysis in low-voltage installation, i.e. the calculation of magnitudes and durations of touch potentials, is not normally included in standard power systems studies. And this analysis is of paramount importance for the protection of persons against electric shock in the event of failure of basic insulation of equipment or of direct contact with live parts. © 2015 IEEE. Source

Discover hidden collaborations