Parameter identification of Sub-synchronous/Super-synchronous oscillations based on synchrophasor rotation and spectral shift

Abstract

Benefiting from the advantage of a unified time scale of measurement data from different sites, the sub-synchronous oscillation (sub-SO) and super-synchronous oscillation (super-SO) detection and mode parameter identification based on a wide-area measurement system can be applied to analyze the development process of oscillation. The phasor measurement units report rate constrains the existing methods, indicating that they can only identify the sub-SO parameters and cannot be extended to super-SO. This study proposes a novel method for sub-SO and super-SO detection and parameter identification based on synchrophasor rotation characteristics and spectral shift. Analyzing the spectral superposition of sub-SO and super-SO components in the real part of the synchrophasor is crucial for realizing sub-SO and super-SO detection. Subsequently, the fundamental, sub-SO, and super-SO components in the synchrophasor are decoupled using the rotational characteristics of the synchrophasor to identify parameters accurately. Compared with the existing methods, the proposed method can realize the expansion of the parameter identification range to super-SO. The effectiveness of the proposed method is verified by simulation and practical engineering cases.