Integration of Transmission Lines Dynamic Thermal rating into real-time Optimal dispatching of power systems

Abstract

This paper proposes a scalable and computationally efficient approach aimed at integrating the Dynamic Line Rating (DLR) of Overhead Transmission Lines (OTLs) in AC-Optimal Power Flow (AC-OPF) problem. The proposed multi-period formulation takes into account realistic models of the different terms of the Heat-Balance Equation (HBE) applied to OTL conductors. These terms are appropriately incorporated in order to preserve the convexity of the OPF that, in this paper, refers to the case of real-time dispatching of a given number of generation units. In this respect, a linearized formulation of AC-OPF is used in the problem definition. The proposed methodology is tested using a small standard case study as well as the IEEE 24 and 118 buses test networks. The results show that the proposed methodology increases the security of the system in conjunction to the capability to decrease the operation cost.