Discussion On 'a Wavelet-neuro-fuzzycombined Approach For Digital Relayingrnof Transmission Line Faults'

摘要

The use of wavelet-neuro-fuzzy intelligence methodology for depicting digital relaying of transmission line faults is a timely approach, which should be elaborated more with future research along the same line. Power system simulation work by MATLAB software is a very useful tool, but without plausible reasoning, it may lead to mechanical achievements in terms of numerical analysis but might be short of sight when linguistic bases are concerned. It seems that the authors did not consider some basic conceptions underlying the fuzzy logic (PL) principle in their proposed model. They mentioned that usually membership functions (MFs) are chosen somewhat arbitrarily and are fixed in nature, which is not quite right. None of the MFs are fixed in nature, but they are flexible depending on the degree of expert view. They misused some points, especially concerning the MFs, which are fully contrary to the philosophy of FL. We would like to present the following important subjects.