Detection and correction of time-skew in SCADA measurement

Abstract

State of power system is often determined by taking simultaneous measurements across the grid. However, in developing countries with geographically expansive grid, if the measurements are not GPS time-stamped there are latencies owing to distance of sensor from control center or communication system performance. The latency and resulting time-skews in data fed as input to state estimator program may either be removed as bad data and also result in lack of convergence or poor state estimation. This research report describes a novel approach to detect and correct of time-skewed SCADA data which would help State-estimator with (a) more measurements data that would otherwise be discarded by bad-data detection module and (b) accurate time-aligned data to make a reliable estimation of Power system state.