Detection and Identification of PQ Disturbances Using S-Transform and Artificial Intelligent Technique
Ahmed Hussain Elmetwaly,
Abdelazeem Abdallah Abdelsalam,
Azza Ahmed Eldessouky,
Abdelhay Ahmed Sallam
Issue:
Volume 4, Issue 1, January 2015
Pages:
1-9
Received:
5 February 2015
Accepted:
15 February 2015
Published:
2 March 2015
Abstract: This paper proposes a new technique based on S-transform time-frequency analysis and Fuzzy expert system for classifying power quality (PQ) disturbances. The S-transform is a new time frequency analysis method. It has the features of both continuous wavelet transform (CWT) and short time Fourier transform (STFT). Through S-transform time-frequency analysis, a set of feature components are extracted for identifying PQ disturbances such as; the amplitude of the S-transform matrix and the total harmonic distortion (THD). The two parameters are the inputs to Fuzzy-expert system that uses some rules on these inputs to characterize the PQ events in the captured waveform (e.g. sag, swell, interruption, surge, sag with harmonic and swell with harmonic). Several simulation using Matlab environment and practical data are used to validate the proposed technique. The results depict that the proposed technique has the ability to accurately identify and characterize PQ disturbances.
Abstract: This paper proposes a new technique based on S-transform time-frequency analysis and Fuzzy expert system for classifying power quality (PQ) disturbances. The S-transform is a new time frequency analysis method. It has the features of both continuous wavelet transform (CWT) and short time Fourier transform (STFT). Through S-transform time-frequency ...
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Factors Affecting the Harmonics Generated by a Group of CFLs: Experimental Measurements
Muhyaddin J. H. Rawa,
David W. P. Thomas
Issue:
Volume 4, Issue 1, January 2015
Pages:
10-16
Received:
9 February 2015
Accepted:
26 February 2015
Published:
4 March 2015
Abstract: The penetration of nonlinear loads on power systems increases the harmonics that can cause detrimental problems to power systems such as an increase in voltage distortion, equipment failure, system resonance, increase system losses and decrease system efficiency. Many factors affect the harmonics produced by nonlinear loads. Hence, the aim of this paper is to evaluate the impacts of system voltage, impedance, frequency and background voltage distortion on the harmonics generated by a group of Compact Fluorescent Lamps (CFLs). Experimental measurements are performed for this purpose.
Abstract: The penetration of nonlinear loads on power systems increases the harmonics that can cause detrimental problems to power systems such as an increase in voltage distortion, equipment failure, system resonance, increase system losses and decrease system efficiency. Many factors affect the harmonics produced by nonlinear loads. Hence, the aim of this ...
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