Institute of Western Macedonia

Kozáni, Greece

Institute of Western Macedonia

Kozáni, Greece
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Bouhouras A.S.,Institute of Western Macedonia | Christoforidis G.C.,Institute of Western Macedonia | Parisses C.,Institute of Western Macedonia | Labridis D.P.,Aristotle University of Thessaloniki
International Conference on the European Energy Market, EEM | Year: 2014

In this paper the problem of network congestion due to high penetration of Distribution Generation (DG) in Distribution Networks (DNs) via network reconfiguration is examined. The problem in DNs is differentiated from the respective one in Transmission Networks (TNs), since the former is examined through a technical perspective while the latter through an economical orientated aspect. In this work, DN congestion is established as the problem of increased loading of the DN branches due to bi-directional power flow. The latter is expected to occur when the load demand of the DN is low and the power production of DG is high. Therefore, a Congestion Indicator Factor (CIF) is introduced in order to describe the tendency of DN towards congestion. Based on the CIF values, network reconfiguration is proposed as a real time solution regarding the online management of the DN in order to mitigate congestions. Results indicate that local reconfigurations could yield both congestion reduction and voltage profile improvement. © 2014 IEEE.

Tsanaktsidis C.,Institute of Western Macedonia | Christidis S.G.,Institute of Western Macedonia | Tzilantonis G.T.,Institute of Western Macedonia
Chemistry and Technology of Fuels and Oils | Year: 2010

The possibility of reducing the moisture content in diesel fuel by using a hydrophilic polymer, TPA (thermal polyaspartate ion), which is simply and cheaply synthesized, was investigated. It was shown that when TPA is added in a given amount to a given volume of diesel fuel, the moisture content decreases significantly. © 2010 Springer Science+Business Media, Inc.

Christoforidis G.C.,Institute of Western Macedonia | Micu D.D.,Technical University of Cluj Napoca | Papadopoulos T.A.,Institute of Western Macedonia | Czumbil L.,Technical University of Cluj Napoca | Parisses C.C.,Institute of Western Macedonia
Proceedings of the Universities Power Engineering Conference | Year: 2013

The recent advancement of renewable energy sources and specifically photovoltaic (PV) units has resulted in outdoor installations of large power stations. This brought up cases where such power stations, in the MWp level and typically connected to the medium voltage level through underground cables, are located in the vicinity of buried metallic pipelines, used by various utilities. Under certain conditions, these cases may result in induced voltages and currents on the pipelines that can pose threats to operating personnel and ac corrosion to the pipeline. This work presents an analysis of the electromagnetic interference in a real case study of a gas pipeline crossing the installation area of a large PV power station. The calculation methodology is based on a hybrid method, in order to balance between desired accuracy and reduced computational time. Voltage profiles across the pipeline are obtained for different cases of normal operating conditions and faults in the power station, leading to remarks that may be useful to engineers. © 2013 IEEE.

Dossis M.F.,Institute of Western Macedonia
Journal of Next Generation Information Technology | Year: 2010

The design and implementation of today's complex embedded systems including custom hardware and software is still to a large extent based on a collaboration of heterogeneous, semi-manual and often poorly inter-connected design methods and tools. The result of this is repetitive and longer development cycles of the intended products. This paper describes an intelligent web service to automatically produce non-standard, custom and directly implementable hardware description code, including its memory and system interfaces from abstract, executable specification (unaltered program) code, via provably-correct formal transformations, via intelligent web interface and via intelligent human-web interactions. Provably-correct hardware compilations are performed on selected high-level program subroutines by employing logic programming techniques and an intelligent inference engine. The intelligent inference engine is invoked automatically within the processes of the implemented high-level synthesis compiler. The proposed methodology and implemented tools are proven applicable and successful by evaluating results from implementation of linear as well as repetitive, nested-loop - based targeted application source code programs.

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