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Abstract
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Modern industrial facilities are vulnerable to voltage sags and short interruptions as they were in thepast to sustainable interruptions. Therefore, modern reliability assessment should include voltage sagsand short interruptions. Hence, in order to improve power system reliability it is necessary to mitigatethese voltage variations. One of the first steps towards this objective is to locate the source of thesedisturbances. This paper investigates a number of methods for sag source relative location. Said methodsare based on different electrical parameters. Using instantaneous positive sequence components fivenovel extended methods for voltage sag source location are proposed for accommodating the transientnature of voltage sag events and for improving unsuitable operation of methods on asymmetrical sagsand earth faults. Due to the fact that short circuits are the main reason resulting in voltage sags, thispaper focuses on the location of voltage sag sources due to line faults. A comparative analysis betweenthe existing methods and the five novel extended methods is performed by applying extensive numericalsimulations in a Brazilian regional transmission and sub-transmission utility. Finally, the effectivenessof all methods is obtained. The results show that the novel extended methods are more effective andamong them, the extended methods based on reactive power can locate sag sources with an accuracy of88%. Also, implementation of the novel extended methods on signal processors is easier with respect tothe already implemented methods.
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