Abstract
Phasor Measurement Units (PMUs) measure voltage and current phasors at the same time and relative to the same angle reference, so that it is feasible to use a Linear State Estimator (LSE) to provide a full system solution from these measurements. This paper explores the practical issues of LSE implementation using a phasor measurement system in the Western Electricity Coordinating Council (WECC) system. This project started with the Virginia Tech LSE algorithm and enhanced it to handle some special issues like series capacitor and multiple line segments in one transmission line. This development and some lessons learned are presented in this paper. The LSE application was tested with simulated PMU data and recorded field PMU data with good results. The LSE showed it is able to solve at the rate of 60 frames per second.
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