Using Wavelet Decomposition for Visualization and Understanding of Time-Varying Waveform Distortion in Power Systems

Harmonic distortion assumes steady state condition and is consequently inadequate to deal with time-varying waveforms. Even the Fourier Transform is limited in conveying information about the nature of time-varying signals. The objective of this paper is to demonstrate and encourage the use of wavelets as an alternative for the inadequate traditional harmonic analysis and still maintain some of the physical interpretation of harmonic distortion viewed from a time-varying perspective. The paper shows how wavelet multi-resolution analysis can be used to help in the visualization and physical understanding of time-varying waveform distortions. The approach is then applied to waveforms generated by high fidelity simulation using RTDS of a shipboard power system. Key Words—. Time-Varying Waveform Distortion, Harmonic Distortion, Wavelets, Multi-Resolution Analysis.

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