This paper proposed a new algorithm to perform the online determination of the low frequency oscillation modes in large interconnected power system.

Research on low-frequency oscillation of Hunan power system under inter-connected state power gird;

Select swing curve to distill low-frequency oscillation information;

Load characteristics effect on low-frequency oscillation damping of power systems;

On the basis of the research results of Hilbert-Huang Transform and the application of it to the field of power system signal analysis in recent years,this paper summaries the study of power quality analysis,the harmonic identification,power system low frequency oscillations,parameter identification of synchronous machine,the partial discharge(PD) signal monitoring.

The frequent and massive power exchange on tie-line between different areas makes the low frequency oscillations, especially in the inter-area mode it is more serious, and it impairs system stability and its performance.

This paper introduces a novel method-HHT which is invented to deal with non-stationary signal to the analysis of low frequency oscillations.

Damping low frequency oscillation after the interconnection of East China and Fujian power grids by adopting TCSC technology;

Prony analysis of low frequency oscillation based on wavelet pretreatment technology;

Study on two-stage control for Unified Power Flow Controller to damp tie-line low frequency oscillation;