Flexible line ratings in stochastic unit commitment for power systems with large-scale renewable generation

The thermal ratings of overhead transmission lines are typically conservative, which leads to underutilization of transmission assets. In this paper, we propose an optimization model that accounts for the inherent flexibility in line ratings of thermal restricted transmission lines. We determine, in a stochastic unit commitment framework, when and which line can and should adopt higher ratings (calculated based on anticipated weather conditions and loading) as part of the recourse actions. Such recourse decisions in the second stage models the capability of the transmission system to provide flexibility to mitigate the variability of renewable generation. Flexible line ratings in the recourse help improve first-stage commitment decisions. Numerical tests conducted on both IEEE 118 system and a network representing the Central European System demonstrate that with flexible line ratings recourse, the expected operation cost can be substantially reduced without degrading reliability.

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