Abstract
The exploitation of power lines currently in operation has now become a common practice among electric system operators. The construction of new power lines requires taking economic, political and social problems into consideration. This paper considers two methodologies adopted by the Italian Transmission System Operator (TSO), Terna S.p.A.: Dynamic Thermal Rating (DTR) and Laser Imaging Detection and Ranging-Geographic Information System (L-GIS). DTR systems dynamically calculate the real transport capacity of a power line. The L-GIS system allows, after the geo-referencing of the power line, the management of any interference between the line and the nearby obstacles, permitting the optimization of the high voltage line operation. In this paper, after a brief illustration of the two methods, the authors report the results of some applications in the Sicilian electrical power High Voltage (HV) system.
Highlights
Stringent environmental constraints and an increase in the generation of electricity from renewable energy sources (RES) are causing increasing problems for the Transmission System Operators (TSOs) [1,2,3,4]; Terna S.p.A. (Italian TSO), for some years, has been forced to exploit existing energy corridors [5,6,7,8,9,10]
The implementation of these Dynamic Thermal Rating (DTR) systems in this power line allows N-1 safety conditions to be maintained on the electrical system by dynamically calculating the conductor temperatures according to real environmental conditions, avoiding problems in the operation of the system electric
When the environmental conditions are favorable for the conductors, even if the current value exceeds the static rating assigned to the power line, the temperatures reached by the conductor are acceptable to ensure the safety of the system, obviously avoiding annealing phenomena of the materials constituting the line
Summary
Stringent environmental constraints and an increase in the generation of electricity from renewable energy sources (RES) are causing increasing problems for the Transmission System Operators (TSOs) [1,2,3,4]; Terna S.p.A. (Italian TSO), for some years, has been forced to exploit existing energy corridors [5,6,7,8,9,10]. Stringent environmental constraints and an increase in the generation of electricity from renewable energy sources (RES) are causing increasing problems for the Transmission System Operators (TSOs) [1,2,3,4]; Terna S.p.A. The use of DTR systems along the electric line is very useful in order to dynamically evaluate the ambient conditions and the temperature of the conductors: the knowledge of these parameters allows the operators to optimize the capability of overhead lines when environmental conditions permit it while avoiding overload situations [8]. In [13] the wide range of real-time line monitoring devices which can be used to determine the DTR of an overhead transmission line in normal or contingency operation is discussed. In [14], considering the growth in RES installation, DTR is investigated as a way to connect the new intermittent generation, Energies 2018, 11, 979; doi:10.3390/en11040979 www.mdpi.com/journal/energies
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