Analysis of Power Quality Disturbances Using Spectrogram and S-transform

Nur Hafizah Tul Huda Ahmad; A. R. Abdullah; N. A. Abidullah; M. H. Jopri

doi:10.15866/iree.v9i3.555

Analysis of Power Quality Disturbances Using Spectrogram and S-transform

Nur Hafizah Tul Huda Ahmad^(1*), A. R. Abdullah⁽²⁾, N. A. Abidullah⁽³⁾, M. H. Jopri⁽⁴⁾

^(*) Corresponding author

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Abstract

The performance analysis of spectrogram and S-transform for power quality disturbances such as swell, sag, interruption, harmonic, inter-harmonic, and transient based on IEEE Std 1159-2009 are presented. These analyses are performed to identify the best performance for detection of power quality disturbances. This is important to provide the improvement of power quality which capable to accurately measured, detect the power quality phenomena. Therefore the accurate detection of power quality disturbances can be developed based on the best techniques. By using both techniques, the temporal and spectral information are obtained. From the time frequency representation (TFR) the signal parameters are estimated such as instantaneous root means square voltage (RMS), total waveform distortion (TWD), total harmonic distortion (THD) and total non harmonic distortion (TnHD).The signal characteristics are calculated from signal parameters to verify the performances of both techniques, the APE results are used to identify the accuracy of these techniques. By perform the analysis; the result show the S-transform is a better tool to analyze the transient disturbances whereas for voltage variation and harmonic disturbances the spectrogram gives higher accuracy result. As a conclusion both techniques are capable to analyzed power quality disturbances, and it clearly shows that, the S-transform has an advantages in term of time-frequency resolution which capable to detect and localized various kind of power quality disturbances and it essential for the development of advanced real-time monitoring.

Keywords

Power Quality, S-Transform, Time Frequency, Spectrogram, Resolution

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