A Case Study of Low Frequency Oscillation Caused by PSS Field Test

In this paper, the event of low-frequency power oscillation caused by power system stabilizer (PSS) field test in a power plant is introduced, and the mechanism of oscillation is analyzed. In view of the existence of several dominant components in this low frequency oscillation accident, an improved measure is proposed to achieve the disturbance source localization. Based on fast Fourier transform (FFT) decomposition of active power and frequency in steady-state oscillation, several dominant components of the oscillation are obtained. By superimposing the non-periodic components of the oscillation energy for several dominant modes, the disturbance source of the low frequency oscillation accident is determined. (paper)