Uncalibrated instrument transformers (ITs) can degrade the performance of downstream applications that rely on the voltage and current measurements that ITs provide. It is also well-known that phasor measurement unit (PMU)-based system-wide IT calibration and line parameter estimation (LPE) are interdependent problems. In this paper, we present a statistical framework for solving the simultaneous LPE and IT calibration (SLIC) problem using synchrophasor data. The proposed approach not only avoids the need for a perfect IT by judiciously placing a revenue quality meter (which is an expensive but non-perfect IT), but also accounts for the variations typically occurring in the line parameters. The results obtained using the IEEE 118-bus system as well as actual power system data demonstrate the high accuracy, robustness, and practical utility of the proposed approach.
@article{arxiv.2503.21202,
title = {System-wide Instrument Transformer Calibration and Line Parameter Estimation Using PMU Data},
author = {Antos Cheeramban Varghese and Anamitra Pal},
journal= {arXiv preprint arXiv:2503.21202},
year = {2025}
}