Comparative Analysis of Different Voltage Sag Characterisation Indices

This paper investigates the characteristics and difference among six single-event characteristics, including the widely used indices which are recommended in IEEE Standard 1564 and the indices proposed recently in literature. The comparison is carried out from the perspectives of severity levels, sensitivity with respect to the variation of sag magnitude and duration respectively, compliance to standards, and inclusion of uncertainties existing in equipment’s response to voltage sags. Through comprehensive comparison analysis, this paper aims to provide guidelines for selecting appropriate sag index for particular study cases provided.

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