KELAG Karntner Elektrizitats Aktiengesellschaft

Klagenfurt am Wörthersee, Austria

KELAG Karntner Elektrizitats Aktiengesellschaft

Klagenfurt am Wörthersee, Austria
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Reinhardt A.,Clausthal University of Technology | Egarter D.,KELAG Karntner Elektrizitats Aktiengesellschaft | Konstantinou G.,University of New South Wales | Christin D.,Fraunhofer Institute for Communication, Information Processing and Ergonomics
2015 IEEE International Conference on Smart Grid Communications, SmartGridComm 2015 | Year: 2015

Solar power has emerged as one of the three most widely installed renewable energy sources around the globe. Photovoltaic (PV) capacity in excess of 150 GW had been installed in 2013 already, and many more installations are connected to worldwide power grids every day; especially in the form of small-scale PV plants in domestic environments. However, in order to connect PV installations to the power grid, their dc output must be converted to the nominal mains voltage and frequency through the use of converters. In this paper, we propose a novel approach to influence the maximum power point tracking (MPPT) component of such a PV converter in order to enable two main privacy-preserving operations: Firstly, by deliberately reducing the output power through changing the converter's operating point, appliance operations can be emulated in order to pretend user presence during periods of absence. Secondly, by running the converter below optimum output power, and feeding real-Time data of an appliance consumption to the device, it is able to hide the appliance's operation from the household's aggregate consumption. We present simulations results that prove how our modified converter design can hide appliance load signatures as well as how it can be used to emulate appliance signatures to falsely indicate user presence. © 2015 IEEE.

Application-orientated research and development activities with special consideration to energy and high-voltage engineering have had a long standing relationship within the energy industry and have always had high relevance. New challenges over the past decade have led to an intensification of the activities and strengthened co-operation between energy utilities, universities and research institutions. In order to demonstrate this, Kelag selected research topics will be presented from the field of high voltage engineering. In the context of the challenges to future energy systems and with respect to flexibility, energy storage and plant availability the relevance to the area of high voltage engineering will continue to grow within the electrical energy engineering industry. © Springer-Verlag 2012.

Leitner S.,KELAG Karntner Elektrizitats Aktiengesellschaft | Rupp C.,KELAG Karntner Elektrizitats Aktiengesellschaft | Berger G.,KELAG Karntner Elektrizitats Aktiengesellschaft
WasserWirtschaft | Year: 2015

Maintenance strategies, which also contain endurance strength management, will become more and more important in the area of hydraulic machines. To meet these requirements, KELAG started a project with the goal to determine the remaining life time of the substantial generators in use and to develop maintenance arrangements according to the results using state of the art processes.

Gober H.,KELAG Karntner Elektrizitats Aktiengesellschaft | Nackler K.,KELAG Karntner Elektrizitats Aktiengesellschaft
Geomechanik und Tunnelbau | Year: 2011

A tunnel lining system of glass fibre reinforced (GRP) was used for the first time for the construction of the Feldsee pumped storage power station - integrated in the Fragant power station group of KELAG-Kärntner Elektrizitäts-AG. This innovative solution, together with the prestressed concrete backfilling, required more elaborate planning and very exact monitoring during construction, but proved considerably more cost effective compared to classic steel armouring. One of the most important questions was how the new system would overcome formation water pressure. The drainage of the tunnel after 20 months of operation has made it possible to gain the first practical experience and the conformation of the system. © 2011 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

Nackler K.,KELAG Karntner Elektrizitats Aktiengesellschaft
WasserWirtschaft | Year: 2012

The storage power plant Koralpe was successfully upgraded to a pumped storage hydropower plant. Only 25 % of the original construction costs yielded into duplicating production. Using existing constructions like reservoir, penstock and turbine, a 3-stage suction pump with a specially-designed blown-out starting mode was used for the first time world-wide. The sealing of the excavation pit for the 35 m deep pump shaft was also a challenge.

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