Investigation of Phase Angle Differences Using Statistical Analysis of Real World State Estimator Data

Phase angle differences may provide very useful insight to guide the operations of the electric power grid. This analysis investigates two different methods to use data-driven statistical analysis methods to identify normal patterns and atypical events based on State Estimator phase angel differences. An ISO provided 15 months of State Estimator data. This data enabled the calculation of phase angle differences for 54 pairs of sites. The identified atypical events for both methods were compared to the ISO´s operations log.