Abstract
This paper presents a method to evaluate the effect of voltage sags in power distribution systems using the historical component reliability data of electric utilities. The proposed method is based on the SCBEMA curve that expresses the representative susceptibility curve by voltage sag for each customer type. These curves are made using the CBEMA curves obtained from experiments on the customers' sensitive equipment. In order to transform SCBEMA curves into the probability damage by voltage sag, the fuzzy membership function is used in this paper. Case studies were performed to analyze the effect of voltage sag by varying parameters. The Monte Carlo simulation method and the historical reliability data in KEPCO are used for case studies.
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