Abstract
The paper presents an approach to determine the maximum power transfer capabilities of electric transmission systems by coupling dynamic line ratings with temperature-dependent line modeling. This approach avoids using a set of predefined, conservative weather conditions often assumed uniform along lines. Specifically, a temperature-dependent power flow algorithm was been developed to account for weather conditions, their effects on conductor temperature, line parameters and line models. Moreover, coupling temperature-dependent line model structures within the temperature-dependent power flow, captures longitudinal variations in weather conditions (and the subsequent non-uniform distribution of electrical parameters) into the steady-state analysis of the power system. This enables determination of the transmission system loadability in terms of both thermal and voltage stability limits. The proposed methodology is applied to the IEEE 4-bus and 39-bus systems; computational impacts and quantifiable differences in maximum power transfer capabilities determined using the proposed approach and a conventional approach are discussed.
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