Comparison of low-frequency oscillation identification between NExT-ERA and SSI-DATA ambient excitation methods

Along with the application of wide-area measurement system,it is of good application prospect to apply the noise-like signals measured by the phasor measurement units under ambient excitation to online identify the modes of low-frequency oscillation. The performances of low-frequency oscillation identification based on NExT-ERA and SSI-DATA ambient excitation methods are assessed. The basic principles of two corresponding algorithms are briefly reviewed,different assessment criteria are set according to their key parameters and simulation conditions,their performances are compared based on the simulative results of modal parameter identification,and their merits and applicability are summarized.