Intelligent system for identification of harmonics originating from single phase nonlinear loads

Kingsley Umeh, Azah Mohamed

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Abstract

This paper presents a new method for identifying harmonic sources originating from various single phase nonlinear loads such as the uninterruptible power supply, personal computer, fluorescent lamp with electronic ballast and personal computer. Signal processing techniques based on fractal and fast Fourier transform analyses have been used to characterize the harmonic signatures of the different types of nonlinear loads. The features obtained from the analyses characterize the harmonic signature of a load type. The features extracted are in the form of fractal numbers, individual harmonic components, total harmonic distortion, crest factor and form factor. Identification of the harmonic sources is achieved by using a rule-based expert system in which the system recognizes and classifies the different types of nonlinear loads from the input current waveforms. The expert system with its user interface has been developed in MATLAB and it has been verified with real current measurements. The results obtained prove that the expert system gives accurate recognition of nonlinear loads. Such an intelligent system is useful for diagnosing a power quality related problem such as harmonics in which it can identify the harmonic source originating from single phase nonlinear loads.

Original languageEnglish
Title of host publicationConference Proceedings - IEEE SOUTHEASTCON
EditorsY. Levy
Pages137-142
Number of pages6
Publication statusPublished - 2005
EventIEEE Southeastcon 2005: Excellence in Engineering, Science and Technology - Ft. Lauderdale, United Kingdom
Duration: 8 Apr 200510 Apr 2005

Other

OtherIEEE Southeastcon 2005: Excellence in Engineering, Science and Technology
CountryUnited Kingdom
CityFt. Lauderdale
Period8/4/0510/4/05

Fingerprint

Intelligent systems
Expert systems
Personal computers
Fractals
Uninterruptible power systems
Fluorescent lamps
Harmonic distortion
Electric current measurement
Power quality
Fast Fourier transforms
MATLAB
User interfaces
Signal processing

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Umeh, K., & Mohamed, A. (2005). Intelligent system for identification of harmonics originating from single phase nonlinear loads. In Y. Levy (Ed.), Conference Proceedings - IEEE SOUTHEASTCON (pp. 137-142)

Intelligent system for identification of harmonics originating from single phase nonlinear loads. / Umeh, Kingsley; Mohamed, Azah.

Conference Proceedings - IEEE SOUTHEASTCON. ed. / Y. Levy. 2005. p. 137-142.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Umeh, K & Mohamed, A 2005, Intelligent system for identification of harmonics originating from single phase nonlinear loads. in Y Levy (ed.), Conference Proceedings - IEEE SOUTHEASTCON. pp. 137-142, IEEE Southeastcon 2005: Excellence in Engineering, Science and Technology, Ft. Lauderdale, United Kingdom, 8/4/05.
Umeh K, Mohamed A. Intelligent system for identification of harmonics originating from single phase nonlinear loads. In Levy Y, editor, Conference Proceedings - IEEE SOUTHEASTCON. 2005. p. 137-142
Umeh, Kingsley ; Mohamed, Azah. / Intelligent system for identification of harmonics originating from single phase nonlinear loads. Conference Proceedings - IEEE SOUTHEASTCON. editor / Y. Levy. 2005. pp. 137-142
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