10-06-2017, 07:06 AM
RECENT TRENDS IN POWER SYSTEMS PROTECTION WAVELET APPLICATIONS
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Abstract:
This paper presents a descriptive overview of the wavelet transform applications in power systems. Wavelet transform has received great attention in power community in the last years, because are better suited for the analysis of certain types of transient waveforms than the other transforms approach. Wavelets can be used to model a variety of power system transients using a fraction of the total number of coefficients.
This modeling technique paves the way for fault classification and improved protection. Several works have addressed its application in the power area. A dyadic-ortho normal wavelet transform analysis is used to detect and localize various types of power quality disturbances, including harmonic distortions.
The wavelet transform is used to detect and quantify non sinusoidal power transients, especially voltage. In a new wavelet transform based procedure for power quality analysis is presented, which is based on the multi solution signal decomposition and reconstruction by means of the Time Discrete Wavelet Transform. The optimized decomposition of signals in frequency sub bands allows the most relevant disturbances in electrical power systems to be not only detected, localized, and classified but also estimated.
In the ability of wavelets to reconstruct transients was demonstrated. This paper shows how wavelets can be used to accurately reconstruct non-stationary power system disturbances and the contribution of individual coefficients to the reconstruction process. In addition, it should be possible for the wavelet coefficients to be used to categorize different types of disturbances. With the combinations of wavelet and signal processing tools, wavelets have been extensively used in a variety of power fields. The aim of this paper is to provide a descriptive overview of wavelet transformation application in power system to those who are novel in study of this subject .