Online Non-Iterative Estimation of Transmission Line and Transformer Parameters by SCADA Data

Utilization of abundant measurements provided by supervisory control and data acquisition (SCADA) system has attracted increasing attention. Real-time estimation transmission line parameters, utilizing voltage power flow remote terminal units (RTUs) located at two substations across the line, been investigated, recently. This paper improves this approach introducing a novel exact linear reformulation problem, which can be solved in closed form. The distributed-parameter model long lines is considered its parameters are estimated non-iterative manner using RTU measurements. method also extended to estimate transformer series impedance tap position SCADA measurements, linearly. As such, disadvantages associated with previous iterative approach, e.g. concern over convergence, for avoided. Moreover, technique estimating allows determine as well updated impedance. Furthermore, thorough analysis presented take measurement accuracy into account. Simulation results different transformers IEEE 118-bus test reported, where result indicate successful performance proposed algorithms.