Edwin S. Jose and Titus S. Sigamony
Harmonic distortion, electric power quality, lifting scheme, wavelet transform, DPT, LWT
This paper presents a method to detect and recognize the power quality disturbances using Lifting Wavelet Transform (LWT). The disturbed signal is decomposed to many frequency sub-bands in frequency domain to identify the disturbing time and level. The aliasing problem presents in the Discrete Wavelet Packet (DPT) can be mitigated using LWT. The LWT paves a way to reconstruct the signal with perfection and elimination of time invariance lag by up-sampling the filter coefficients as well. A critical evaluation of the LWT and the DPT for standard power quality disturbances are provided using MATLAB. The results prove the triumph of the LWT.
Important Links:
Go Back
