An Analytical Formulation of Power System Oscillation Frequency

TL;DR

This paper introduces an analytical method to determine power system oscillation frequency based on oscillation amplitude, revealing its damping-insensitive nature and applicability to multi-machine systems under large disturbances.

Contribution

It presents a novel analytical formulation linking oscillation frequency to amplitude, enhancing understanding of power system dynamics during large disturbances.

Findings

Oscillation frequency depends only on amplitude when system conditions are fixed.

The frequency-amplitude relationship is damping-insensitive.

Applicable to inter-area oscillations in multi-machine systems.

Abstract

This letter proposes an analytical approach to formulate the power system oscillation frequency under a large disturbance. A fact is revealed that the oscillation frequency is only the function of the oscillation amplitude when the system's model and operating condition are fixed. Case studies also show that this function is damping-insensitive and could be applied to an inter-area model of a multi-machine power system.