Determination of Transmission Line Parameters by Utilizing Synchrophasor Measurements
Abstract
Modeling of transmission lines in electrical power systems is very important for power system engineering. Conventional methods for transmission line parameter determination take into account numerous factors. It is not applicable in most cases to use all the factors for parameter identification. PMU based methods, an innovative approach compared to the conventional methods, use synchrophasor voltage/current measurements from the both ends of the transmission line. In case of using PMU-based methods, transposition of transmission line gains importance in determining line parameters. Positive or negative sequence impedance parameters can be estimated accurately for a transposed transmission line. However, positive sequence model-based methods give rise to erroneous parameter estimations for an untransposed transmission line which is frequently encountered in practice. Therefore, three different PMU based methods are examined in case of transposed or untransposed line with balanced and unbalanced load.
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