Locating capacitor transients disturbance source using complex wavelets

Noraliza Hamzah, Azah Mohamed, Aini Hussain

Research output: Contribution to journalArticle

Abstract

This paper presents the application of complex wavelet power and wavelet energy flow for locating the source of a transient disturbance. By using the complex wavelet transform, the current and voltage at the monitoring point is decomposed into its real and imaginary parts. The transient power at the monitoring point is then calculated and the complex wavelet energy is obtained by integrating the transient power. This paper shows that by examining the initial peak power and energy flow, it is possible to locate the source of transient disturbance. From the wavelet energy plots, it can be concluded that a decreasing in wavelet energy indicates that the transient source is downstream or in front of the monitoring point. On the other hand, an increase in wavelet energy indicates that the transient source is upstream or behind the monitoring point. To verify the wavelet energy method, simulations using the PSCAD/EMTDC software have been performed. Switching of capacitors has been simulated for generating the oscillatory transient of a power distribution system. The capacitor switching cases considered in this paper are normal capacitor energization, back-to-back capacitor switching, capacitor voltage magnification and capacitor switch restrike on de-energizing. Simulation results prove that the wavelet power and wavelet energy is capable of correctly locating the transient source in a power distribution system.

Original languageEnglish
Pages (from-to)95-107
Number of pages13
JournalEngineering Intelligent Systems
Volume16
Issue number2
Publication statusPublished - Jun 2008

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Capacitors
Monitoring
Electric potential
Wavelet transforms
Switches

Keywords

  • Complex wavelet transforms
  • Power quality
  • Transient

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Control and Systems Engineering
  • Computer Science Applications

Cite this

Locating capacitor transients disturbance source using complex wavelets. / Hamzah, Noraliza; Mohamed, Azah; Hussain, Aini.

In: Engineering Intelligent Systems, Vol. 16, No. 2, 06.2008, p. 95-107.

Research output: Contribution to journalArticle

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