Co-Optimization of Network Topology and Variable Impedance Devices under Dynamic Line Ratings in Power Transmission Systems

TL;DR

This paper introduces a unified co-optimization framework for power transmission systems that integrates network topology, variable impedance devices, and dynamic line ratings to reduce congestion and operational costs.

Contribution

It develops a novel joint optimization model that coordinates multiple grid enhancement technologies, including a detailed node-breaker topology formulation and weather-aware dynamic line ratings.

Findings

Effective congestion mitigation demonstrated on IEEE test systems.

Coordination of GETs reduces operational costs.

Adaptive capacity utilization improves system flexibility.

Abstract

Power system operators are increasingly deploying Grid Enhancing Technologies (GETs) to mitigate operational challenges such as line and transformer congestion, and voltage violations. These technologies, including Network Topology Optimization (NTO), Variable Impedance Devices (VIDs), and Dynamic Line Rating (DLR), enhance system flexibility and enable better utilization of existing network assets. However, as the deployment of multiple GETs grows, effective coordination among them becomes essential to fully realize their potential benefits. This paper presents a co-optimization framework that models and coordinates NTO, VID, and DLR within a unified optimization scheme to alleviate network congestion and minimize operational costs. The NTO formulation is developed using a node-breaker model, offering finer switching granularity and improved operational flexibility. The inclusion of VIDs introduces nonlinear and non-convex relationships in the optimization problem. DLR takes into account of weather conditions, primarily wind speed and ambient temperature, enabling adaptive utilization of transmission capacity. The proposed framework is validated on standard IEEE benchmark test systems, demonstrating its effectiveness under varying numbers and placements of impedance controllers.