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Diagnosis of Oscillatory Transients Generated by Switching of Capacitor Banks using MPA

An Oscillatory Transient (OT) can occur in any part of an Electric Power System (EPS), and its basic characteristics are short duration and considerable variances of the amplitude of the voltage and frequencies involved. Focusing on a medium voltage distribution system, one of the main causes of the OT is the capacitor bank switching, which should be differentiated from other situations that may occur. In this research, we present the diagnostic (identification and extraction of characteristics) of OTs generated by the switching of capacitor banks by applying the Matching Pursuit Algorithm (MPA), that is based on a structured data dictionary. The Golden Search (GS) was used to find the characteristic parameters of the OT. The adopted methodology provided a sensible improvement in the search of the parameters, where the number of iterations was reduced and the estimations were stable. Sensitivity tests of the obtained parameters indicated their relevance for the data dictionary that was used. Based on this approach, it was possible to identify the amplitude (instantaneous value) of the OT as well as its duration. The use of the MPA enables researches with diverse signals, where the concern may be linked to the need to identify the origin of the OT observed on a particular EPS. This analysis, for example, can support areas related to power quality and also protection of electrical power systems.