KIEE International Transactions on Power Engineering

The Korean Institute of Electrical Engineers (대한전기학회)
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A Novel Detection Technique for Voltage Sag in Distribution Lines Using the Wavelet Transform

  • Ko, Young-Hun (Product R&D center in Daewoo Computer) ;
  • Kim, Chul-Hwan (School of information & Communication Engineering, Sungkyunkwan University) ;
  • Ahn, Sang-Pil (Korea Electrotechnology Research Institute)
  • Published : 2003.09.01
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Abstract

This paper presents a discrete wavelet transform approach for determining the beginning and end times of voltage sags. Firstly, investigations in the use of some typical mother wavelets, namely Daubechies, Symlets, Coiflets and Biorthogonal are carried out and the most appropriate mother wavelet is selected. The proposed technique is based on utilizing the maximum value of Dl (at scale 1) coefficients in multiresolution analysis (MRA) based on the discrete wavelet transform. The results are compared with other methods for determining voltage sag duration, such as the Root Mean Square (RMS) voltage and Short Time Fourier Transform (STFT) methods. It is shown that the voltage sag detection technique based on the wavelet transform is a satisfactory and reliable method for detecting voltage sags in power quality disturbance analysis.

Keywords

References

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