Dynamic rating analysis of overhead transmission line OHL 220 kV

Abstract

Operating an overhead transmission line (OHL) use a static line rating method to ensure the grid operating under a pre-defined limit temperature of the conductors. This method assesses the maximal power capacity of each OHL using conservative constant weather conditions that usually underestimate the real capacity of lines. Dynamic line rating (DLR) analysis represent a safe and cost-efficient way to deal with existing congested grid and allow further integration of future renewable generation. Our work applies a DLR tool to identify the power lines’ additional capacity obtained for a Vietnam’s 220 kV’s line with distinct conditions: Weather data, line topography. The capacity values obtained are presented, and a comparison with the traditional values obtained from the static methodology used by the Vietnam’s system operator is discussed. The results show that the dynamic approach enables significant gains in the overhead line rating for a case study and it can be extended to regions with congested network and high wind resource.