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Abstract-The method of voltage sag source location proposed in this paper is using wavelet-multiresolution to decompose the voltage and current waveforms from monitoring points and analyzing the change of signal energy of three-phase instantaneous power during voltage sag to ascertain the sag source location relative to the monitoring points. The location of voltage sag caused by line fault, transformer energizing and induction motor starting, which are the main reason of sag, are analyzed and tested using this method based on an PSCAD simulation model in this paper. The results show that the method is simple and reliable and can be used to determine sag source location.

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