Online identification of coherent generators based on slow coherency theory and Hilbert-Huang transform
Luyu Ji · Dianli zidonghua shebei · 2013
A method of online identification of coherent electric generators is proposed,which adopts the slow coherency grouping algorithm to determine the group number of optimal slow coherency clustering and applies the Hilbert-Huang transform,based on the correlation coefficients of group matrix,the participation factors of oscillation model and the power angles measured by the wide area measurement system,to abstract the modal energy spectrum of generator oscillation for identifying the coherent generator group after disturbance.Simulative experiments for WSCC system and New England 10-machine 39-bus system show that,the dynamic performances and non-linear time-varying characteristics of power system after disturbance can be completely demonstrated by the proposed method reflects,verifying its applicability and effectiveness.