Báo Cáo Discrete wavelets transform technique application in identification of power quality disturbances

ABSTRACT
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Poor power quality may cause many problems for affected loads, such as malfunctions, instabilities, short
equipment lifetime, and so on. Poor quality electric power is normally caused by power-line disturbances,
such as lightning impulses, interruptions, voltage swell, voltage sag, harmonic distortion, and flicker, and
this results in failure or misoperation of end-user’s equipment. In order to improve power quality, the
sources and causes of such disturbances should be identified and localized before appropriate mitigating
actions can be taken. In the paper the Discrete Wavelet Transform (DWT) Technique with
Multiresolution Analysis (MRA) capability is used to identify and classify various power disturbance
types simulated with the help of Alternative Transient Program - ElectroMagnetic Transient Program
(ATP-EMTP). The analysis conducted and results obtained show the merit of methods in use and
prospective applications of wavelet technique to power disturbances assessment.