Mode Identification of Broad-band Oscillation Signal Based on Improved VMD Method

Abstract

Oscillation is one of the most important factors that affect the safety and stability of power system. In a power system, there may be multiple types of oscillation signal occurring at the same time. In this paper, a method based on improved variational modal decomposition(VMD) algorithm is proposed to identify the mode of broad-band oscillation signal. First, different types of oscillation are separated from broad-band oscillation signal by band pass filter. And then the modal signals are extracted from the filtered signals by improved VMD method. Finally, the parameters of the modal signals are identified by prony algorithm. The simulation shows that the method can extract the modal signals from broad-band signal and identify the parameters accurately.