Analytical Approach to Phasor-based Line Parameter Estimation Verified Through Real PMU Data

Abstract

Synchrophasor measurements enable the validation of transmission line parameters utilized by state estimation software, relays and fault locators. Despite quite a few algorithms proposed earlier, practical implementation results are almost absent, and only simulated phasors are often taken for testing. This work provides a simple regression-based approach for positive sequence line parameter estimation through line terminal PMU data. The key feature is thorough testing of the proposed technique on real phasor archives collected from four different lines located in two distinct power systems. Promising results obtained in such a "black-box" rather than software-only impractical simulations serve as an indicator of the algorithm’s validity. We also highlight an attempt of zero sequence line parameter estimation based on PMU archives collected under power system imbalance. The derived results can be thought of as a first step towards putting PMU-driven parameter estimation methods into practice.