Out of step protection in modern power networks

2004 ◽  
Author(s):  
D. Paunescu
Keyword(s):  
Power Networks

The Fate of Small Towns, Hilltop Settlements, and Elite Residences in Merovingian-Period Gaul

2020 ◽  
pp. 610-640
Author(s):  
Luc Bourgeois
Keyword(s):  
Middle Ages ◽  
Late Antiquity ◽  
Fourth Century ◽  
Small Towns ◽  
Seventh Century ◽  
Archaeological Research ◽  
Power Networks ◽  
Early Middle Ages ◽  
The Many

The study of places of power in the Merovingian realm has long been focused on cities, monasteries, and royal palaces. Recent archaeological research has led to the emergence of other categories. Four of them are addressed in this chapter. These include the capitals of fallen cities, which continue to mark the landscape in one way or another. Similarly, the fate of small Roman towns during the early Middle Ages shows that most of them continued to host a variety of secular and ecclesiastical powers. In addition, from the fourth century onward, large hilltop fortified settlements multiplied anew. They complemented earlier networks of authority, whether elite residences, artisan communities, or real towns. Finally, from the seventh century onward, the great aristocratic villas of late antiquity were transformed into settlements organized around one or more courtyards and supplemented by funerary and religious structures. The evolution of political spaces and lifestyles explains both the ruptures in power networks that occurred during the Merovingian epoch and the many continuities that can be seen in the four kinds of places studied in this chapter that were marked by these developments.

scholarly journals MILP formulation for controlled islanding of power networks

2013 ◽  
Vol 45 (1) ◽  
pp. 501-508 ◽  
Author(s):  
P.A. Trodden ◽  
W.A. Bukhsh ◽  
A. Grothey ◽  
K.I.M. McKinnon
Keyword(s):  
Power Networks ◽  
Controlled Islanding

Self controlling autonomous operating power networks

2005 ◽  
Author(s):  
F. Provoost ◽  
A. Ishchenko ◽  
A. Jokic ◽  
J.M.A. Myrzik ◽  
W.L. Kling
Keyword(s):  
Power Networks

Pilot Tests of FasTR Method for Locating Transient Faults in Medium Voltage Underground Power Networks

2020 ◽  
pp. 1-1
Author(s):  
Moussa Kafal ◽  
Nicolas Gregis ◽  
Jaume Benoit ◽  
Nicolas Ravot ◽  
Clara Lagomarsini ◽  
...  
Keyword(s):  
Transient Faults ◽  
Power Networks ◽  
Medium Voltage ◽  
Pilot Tests

scholarly journals Voltage Variations and Their Reduction in a Rural Low-Voltage Network with PV Sources of Energy

Electronics ◽  
2021 ◽  
Vol 10 (14) ◽  
pp. 1620
Author(s):  
Agata Szultka ◽  
Seweryn Szultka ◽  
Stanislaw Czapp ◽  
Ryszard Zajczyk
Keyword(s):  
Low Voltage ◽  
Power Production ◽  
Legal Regulations ◽  
Sectional Area ◽  
Overhead Line ◽  
Power Networks ◽  
Cable Line ◽  
Cross Sectional ◽  
Voltage Level ◽  
Wide Scale

Renewable sources of energy (RES), especially photovoltaic (PV) micro-sources, are very popular in many countries. This way of clean power production is applied on a wide scale in Poland as well. The Polish legal regulations and tariffs specify that every prosumer in a low-voltage network may feed this network with a power not higher than the maximum declared consumed power. In power networks with RES, the voltage level changes significantly along the power line and depends on the actually generated as well as consumed power by particular prosumers. There are cases that prosumers connected to this line cannot produce and inject the full permissible power from PV sources due to the level of a voltage higher than the technically acceptable value. In consequence, it leads to the lack of profitability of investments in installations with PV sources. In this paper, voltage variations in a real rural low-voltage network with PV micro-sources are described. The possible two general solutions of voltage levels improvement are discussed—increase in the cross-sectional area of the bare conductors in the existing overhead line as well as the replacement of the overhead line with a cable line. The recommended solution for the analyzed network, giving the best reduction of voltage variations and acceptable cost, is underlined. Such a recommendation can also be utilized in other rural networks.

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