Broadband Oscillation Monitoring Using Interpolation FFT

In this paper, a methodology for monitoring broadband oscillations in modern electric power systems is presented. The core of the methodology is the interpolation FFT algorithm using the Blackman-Harris window and three-spectral line technique. The methodology is not only capable of identifying sub-synchronous oscillation signals, but also has the potential for monitoring broadband oscillation in the power system with high penetration of renewable resources. Two data sets are tested using the algorithm, one is a pure computer-generated signal, and the other is obtained from digital simulations obtained from DIgSILENT PowerFacotry platform. Good performance and accuracy of the method are observed from the results of the tests.