Open AccessDetection and classification of disturbances in the islanded micro‐grid by using wavelet transformation and feature extraction algorithm
Author(s) -
Wang Yunqi,
Raza Ahmed,
Mohammed Faisal Parvez,
Ravishankar Jayashri,
Phung Toan
Publication year - 2019
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2018.9362
Subject(s) - voltage sag , wavelet , computer science , digital signal processing , pattern recognition (psychology) , feature extraction , harmonics , artificial intelligence , rényi entropy , entropy (arrow of time) , wavelet transform , transformation (genetics) , wavelet packet decomposition , signal processing , algorithm , power quality , voltage , engineering , principle of maximum entropy , biochemistry , chemistry , physics , quantum mechanics , gene , computer hardware , electrical engineering
Digital signal processing (DSP) methods have been used by many researchers for detection and classification of transient disturbances because of their fast and powerful abilities to recognise waveform distortions. However, some DSP methods such as the wavelet transformation (WT) show less accuracy when applied to noisy real data. In this study, disturbance features are extracted in the wavelet domain based on the WT levels. Moreover, a new feature extraction algorithm namely normalised Renyi entropy with the signal energy is applied. This algorithm has been proven to be effective and robust for noisy signals. However, their application in power systems has not yet been tested. Using a laboratory setup of an islanded micro‐grid, experimental results validate the efficacy of the wavelet‐based normalised Renyi entropy in the detection and classification of four disturbance types (voltage sag, interruption, harmonics, mixture of harmonics and sag).