Abstract
This paper deals with the analysis of PQ
abnormalities using Hilbert–Huang Transform (HHT). HHT
can be applied to both non-stationary as well as non-linear
signals and it provides the energy-frequency-time
representation of the signal. HHT is a time–frequency analysis
method having low order of complexity and does not include
the frequency resolution and time resolution fundamentals.
So, it has the potential to outperform the frequency resolution
and time resolution based methods. Several cases have been
considered to present the efficiency of HHT. For the case
study, various PQ abnormalities like voltage sag, swell and
harmonics with sag are considered. These PQ abnormalities
are subjected to HHT and the results are shown in the form of
IMFs, instantaneous frequency, absolute value, phase and
Hilbert Huang Spectrum. The results shows that the HHT
performs better than the any other time resolution and
frequency resolution based methods.
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