Nowerdays, due to the penetration of power electronics based loads and microprocessor based controlled loads. We have to give more importance to power Quality problems. In order to improve the power quality, the sources of power quality disturbances should be recognized and classified earlier. So many techniques are proposed so far in many research papers under feature extraction and classification. This paper gives a survey of the various papers and it will be use full for the researchers to know about the various methods discussed and helps to do the further work in this area.
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