Empirical estimation approach to the study of inter-area resonance interactions in power systems

Abstract

Studies to deal with the identification of inter-area resonance interactions by fault diagnosis and historical databases at interconnected power systems have led to the development of new methods to delimit and split resonant regions and their control area regulations. This paper contributes in employing the frequency-domain empirical orthogonal functions (EOFs) for the measurement-based analysis of the inter-area resonance modes and its neighborhood. This multi-resolution empirical approach, developed for multiple-input multiple-output (MIMO) systems, is considered to contribute in understanding the spatial orientation properties and the dynamical/physical behavior of inter-area resonance interactions. Also, the method contributes much in advancing our knowledge of inter-area phase-matching patterns (PMPs) modes and their phase shifts from large data sets. In order to demonstrate the usefulness of obtaining and delimiting neighboring areas with resonant interactions in interconnected power systems, the proposed method is numerically applied in detail to the IEEE 16-generator 68-bus test system.