A comparison of voltage sag estimation algorithms using optimal monitorring locations

The aim of voltage profile sag estimation (VPSE) is to reconstruct the voltage profile at non-monitored buses using measurements only from monitored buses. This paper compares two methods for voltage profile estimation: one which focuses on fault localization and another which reconstructs profiles using voltage thresholds. The two algorithms are compared using a generic 295 bus generic distribution network and 4 sets of monitoring locations. The 4 monitoring locations are selected using a bespoke artificial immune system optimization algorithm. The results of the two methods are compared by analyzing the distribution of error between the two methods and the estimated generalized sag tables of both algorithms. Preliminary results suggest that the two methods are very comparable in performance. Both algorithms are shown to be sensitive to the selected monitoring locations, and perform well even when the number of monitors is much less than the number of buses.