A Survey on Forced Oscillations in Power System

TL;DR

This survey reviews methods for detecting, distinguishing, and locating forced oscillations in power systems, emphasizing their impact on system stability and the importance of timely identification for reliability.

Contribution

It provides a comprehensive overview of analysis techniques for forced oscillations and discusses future research opportunities in this area.

Findings

Various algorithms for detecting forced oscillations are summarized.

The importance of distinguishing forced from free oscillations is highlighted.

Future research directions in forced oscillation analysis are discussed.

Abstract

Oscillations in a power system can be categorized into free oscillations and forced oscillations. Many algorithms have been developed to estimate the modes of free oscillations in a power system. Recently, forced oscillations caught many attentions. Techniques are proposed to detect forced oscillations and locate their sources. In addition, forced oscillations may have negative impact on the estimation of mode and mode-shape if they are not properly accounted for. To improve the power system reliability and dynamic properties, it is important to first distinguish forced oscillations from free oscillations and then locate the sources of forced oscillations in timely manner. The negative impact of forced oscillation can be mitigated when they are detected and located. This paper provides an overview on the analysis technique of forced oscillations in power systems. In addition, some future opportunities are discussed on forced oscillation studies.