An Extended Kalman Filter Enhanced Hilbert-Huang Transform in Oscillation Detection
For power system analysts, this is an incremental improvement to a known method for oscillation detection.
The paper presents an extended Kalman filter enhanced Hilbert-Huang transform to overcome mode mixing and end effects in oscillation detection. Numerical results on simulated and real-world data show the method can mitigate these issues with a properly chosen number of modes.
Hilbert-Huang transform (HHT) has drawn great attention in power system analysis due to its capability to deal with dynamic signal and provide instantaneous characteristics such as frequency, damping, and amplitudes. However, its shortcomings, including mode mixing and end effects, are as significant as its advantages. A preliminary result of an extended Kalman filter (EKF) method to enhance HHT and hopefully to overcome these disadvantages is presented in this paper. The proposal first removes dynamic DC components in signals using empirical mode decomposition. Then an EKF model is applied to extract instant coefficients. Numerical results using simulated and real-world low-frequency oscillation data suggest the proposal can help to overcome the mode mixing and end effects with a properly chosen number of modes.