Implementation of Dynamic Line Rating technique in a 130 kV regional network

Abstract

Abstract-This paper investigates the possibility of using Dynamic Line Rating (DLR) to increase the existing power transmission capacity of overhead lines. The main contribution is to combine theoretical calculations and modeling with real application to conclude benefits of DLR. Both introduction of relevant theory and a case study on a power distribution system in Sweden are included. The concept of DLR implies that the capacity of a component dynamically varies as a function of external parameters, such as weather conditions and loading history. Traditionally, the rating is statically set from simulations of worst-case scenarios. Based on conventional static line rating (SLR) methods, the actual current carrying capability of overhead conductors is underestimated. When an increase in the line current capacity is needed, overhead lines may be rated based on a method that allows system operators to run the lines closer to their actual real-time capacity.Furthermore, the paper addresses the problems of observing safe ground clearance requirements. Knowing the conductor temperature, when it transmits the required electricity is an important factor to be taken into consideration. Therefore, based on real-time ambient conditions with actual line loading and with the help of IEEE-738-2006 standard, the conductor temperature is also calculated in this paper. Finally, an economic analysis is performed to evaluate the financial advantages of applying the dynamic line ratings approach compared to traditional static line ratings technique for a specific overhead conductor (VL3).

Impacts of dynamic line rating on power dispatch performance and grid integration of renewable energy sources

“…Foss et al [6] characterized DLR calculation methods into two approaches: the conductor temperature approach that relies on conductor realtime current and temperature measurements, and the weather approach that calculates DLR from the ambient condition. Because conductor temperature measurements are normally not available, the weather approach is more widely used in dispatching studies, because measurements on conductors are not available and DLR is calculated from weather conditions such as air temperature, wind speed, and wind angle [7]- [11].…”

“…By factoring in the cooling effect of wind, a 10-20% increase in the minimum line rating can be expected in windy areas [12], while a wind speed of 6m/s can at maximum double the line rating compared to the nominal case [10]. A case study showed that applying DLR to the 132kV line between Skegness and Boston enabled the grid integration of 20-50% more wind generation than by using the more conservative NLR [13], while another case study applied DLR to a 130 kV regional network and also showed that DLR is significantly profitable in the ampacity upgrading of overhead lines [11].…”

Optimizing Grid With Dynamic Line Rating of Conductors: A Comprehensive Review

“…[59]- [61], and elevated temperature creep [56], [61]. Figure 1 illustrates that both atmospheric and conductor conditions [62]- [65] affect a conductor's line rating. Atmospheric conditions affect the line temperature and line rating, which can cause line to elongate and sag.…”

Feeder dynamic rating application for active distribution network using synchrophasors

“…the conductor current that produces maximum allowable conductor temperature at a specific location and time along the power line [7]) can be computed by DLR systems in order to utilize the conductor full capacity. Making better use of the "ampacity" using these systems has shown to return annual benefit of 35,000 USD/GWh as compared to conductor upgrading and the construction of new line which give an economic benefit of 17,000 USD/GWh and 11,000 USD/GWh, respectively [8].…”