Empirical estimation of system parallel resonant frequencies using capacitor switching transient data

Simple yet accurate techniques for estimating system parallel resonant frequencies are presented. The proposed techniques make use of existing power quality data, specifically those of capacitor switching transients, to determine frequency estimates. A detailed representation of the system including the data required to develop device models (transmission lines, transformers, loads, etc.) is not required. The efficacy and pitfalls of the technique was demonstrated using power quality data collected at transmission and distribution systems where resonant frequencies were known so as to identify the best application environment of the technique. Frequency estimation results correspond closely to actual system resonant frequencies.