Identification and correction of transmission line parameter errors using SCADA and synchrophasor measurements

An efficient operation of a power system relies on the use of a huge amount of information. Among those are the transmission line parameters. It is crucial that such parameters, which are stored at the control center's database, are as accurate as possible. This paper proposes a robust and efficient method for identifying and correcting erroneous transmission line parameters, using a dedicated parameter estimator, based on measurements from both SCADA and phasor measurement units (PMUs). Besides, the parameter estimator is part of an integrated framework for the evaluation of erroneous transmission line parameters considering all lines in the network, namely, those with PMUs at both ends, PMU at one end, as well as transmission lines without any PMUs at their ends. The proposed method proved to be effective for identifying and correcting line parameters, even in situations where relatively large measurement noise is present, because of the low accuracy of measuring devices and instrument transformers. Simulations with the IEEE 14-, 118- and 300-bus systems were carried out to evaluate the performance of the proposed method.