Analysis of symmetrical components in time-domain

This paper presents a novel system for estimating the symmetrical components of a three-phase set of signals in the time-domain. Symmetrical components are significant in the area of power systems and they are used for analysis, design, control and compensation purposes. Viewed in the context of signal processing, the symmetrical components are all located at a single frequency in the frequency spectrum of the signal. Thus, it is a challenge to decompose and to estimate them using the conventional concept of linear filters. The technique presented in this paper employs nonlinear analysis to achieve the task of extracting the symmetrical components. The proposed system is capable of extracting the symmetrical components and of estimating their parameters, including magnitudes, phase-angles and frequency, in time-domain.