Research on dynamic line rating calculation algorithm with spatial interpolation and Terrain Roughness Index

This paper calculated the DLR (Dynamic Line Rating) using hourly temperature and wind speed data measured at meteorological observation stations. Inverse Distance Weighting (IDW) was applied to interpolate the meteorological data measured at weather stations to values for actual transmission lines. Additionally, for wind speed, the Terrain Roughness Index (TRI) was applied to quantify the surface roughness varying with terrain and improve the accuracy of the estimated wind speed. The accuracy of this methodology is evaluated using RMSE (Root Mean Square Error). Applying data from 10 meteorological stations yielded an RMSE of 1.24 to 1.33 for temperature and 0.78 to 0.79 for wind speed. The DLR calculation showed a 31.2% margin relative to the ACSR conductor's rated current during the normal condition in August, when temperatures were highest. Even during a single line fault on the 345kV line, a 6.5% margin was maintained.