Generalized persistent fault detection in distribution systems using network flow theory

Greber, Márton and Fodor, Attila and Magyar, Attila (2020) Generalized persistent fault detection in distribution systems using network flow theory. In: 21st IFAC World Congress, 2020.07.11-2020.07.17, Berlin, Germany (online).

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Abstract

Persistent faults are steady state anomalies with a magnitude which does not necessary trigger general protective gear. It is present in various types of distribution networks, as leak in pipe networks or as high-impedance fault in electric systems. As smart meters come into general use, distribution systems are upgraded to have advanced metering infrastructure. The amount of consumer data is thereby increased, which can be used for diagnostic purposes. Different kind of detection methods, improvements are presented in different physical domains. However, persistent fault detection lies on basic physical principles like the conservation of energy. In order to be able to develop and evaluate methods, which target basically the same problems, the notions of the well established general network theory are being used. New formal definitions are presented to handle measurement data. In this framework a general extension of Flow networks is presented which enables the detection of faults which are not present from the beginning in our model, between metered points. The solution to this problem is presented in the form of a two-stage evolutionary algorithm. Finally the working of the methods is illustrated and verified through a simple simulation based case study.

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