ABSTRACT
A new method was proposed based on permutation entropy toward detection to the instantaneous voltage disturbances signal. At first, it used the CEEMD to decompose the signals to get the Intrinsic Mode Function (IMF) components, and then figured out the permutation entropy of each IMF component to test the randomness to estimate whether the IMF component is an abnormal signal. Afterwards, refactoring the normal IMF components to get the de-noised signals of the instantaneous voltage disturbances, it can be preferable to persist the disturbance characteristics of the disturbance signal; permutation entropy curve can get mutations of power quality at the beginning and ending of the perturbation moment. The results of simulation show that the method has advantages such as antinoise ability, small waveform distortion, and exact extraction of disturbance characteristics; it can be applied in de-noising and location of the instantaneous voltage disturbances.
