Identification method for power system low-frequency oscillations based on improved VMD and Teager–Kaiser energy operator

An improved variational mode decomposition (VMD) method is introduced into the mode recognition of low-frequency oscillation of power system in this study. First, fast Fourier transform is used to determine the number of VMD components, and the approximate fitting formula of the best balancing parameter α is obtained by a large number of tests. The original signal is decomposed into several modes ...