On the Persistence of Dominant Inter-Area Oscillation Paths in Large-Scale Power Networks

Abstract

This article discusses the degree of persistence of dominant inter-area oscillation paths: the passageways containing the highest content of inter-area oscillations in large-scale power networks. To this aim, a number of contingency studies are carried out: faults being imposed on the lines connecting to the dominant inter-area path. The path persistence is then examined using the relationship between sensitivities of network variables (i.e. voltages and current, magnitude and angle), and mode shapes describing the contribution of the oscillations among the generators variables (e.g. speed and angle). This relationship is termed network modeshape. The larger in magnitude and the lesser the variation the network modeshape is, the more observable and the more robust the signals measured from the dominant path becomes. The outcome is a proposed signal combination to be used as inputs to the damping controller for mitigation of inter-area oscillations in large-scale power systems.

Analysis of communication network challenges for synchrophasor-based wide-area applications

“…In a WAMPAC application for measurement-based dynamic power system stability assessment [15], PMU measurements would ideally be deployed in the far ends of a dominant inter-area path [16], as the combination of signals from it provide the highest dynamic observability [17]. Applying modal estimation techniques, properties 2 of sensitive modes of a mode can be estimated.…”

Dominant inter‐area oscillation path analysis of power systems with a high penetration of permanent magnet synchronous generator by using network mode energy

“…However, this method is utilized to analyse the transient stability of power systems and obtain good application results. Studies have focused on the transient stability of power systems, and they can also be used as a reference to solve the problem of LFO by using energy [18][19][20][21][22][23][24][25][26]. Energy function has been introduced into the analysis of LFO, but methods based on traditional energy function are utilized to directly analyse LFO; furthermore, most of them are based on external analysis in the time domain.…”

“…Network structures and operation parameters affect the potential energy sharing of line modes. In the dominant inter-area oscillation mode, the main line where energy is exchanged is called the dominant inter-area oscillation path [25]. The determination of the dominant path is essential for determining the oscillation source and propagation channel of electromechanical oscillation and the elements participating in oscillation [27][28][29].…”

“…This relationship can be used to analyse the characteristics of small‐signal stability from the perspective of network and load power increment; however, the mode shape cannot be analysed, and the oscillation centre cannot be obtained. In another study [25], the oscillation path of power oscillation is identified by using the relationship between the voltage, current, and small disturbance state quantity of generators. The algorithm is simple and easy to implement in engineering.…”