Faulty Line Selection Based on Modified CEEMDAN Optimal Denoising Smooth Model and Duffing Oscillator for Un-Effectively Grounded System

Figure 6

Hilbert–Huang spectrums of four methods. (a) EMD. (b) EEMD. (c) CEEMDAN. (d) MCEEMDAN.

(a)

(b)

(c)

(d)