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A Smart Online Over-Voltage Monitoring and Identification System

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Author(s): Jing Wang | Qing Yang | Wenxia Sima | Tao Yuan | Markus Zahn

Journal: Energies
ISSN 1996-1073

Volume: 4;
Issue: 4;
Start page: 599;
Date: 2011;
Original page

Keywords: smart grid | over-voltage | identification | S-transform | fuzzy expert system

ABSTRACT
This paper proposes a complete and effective smart over-voltage monitoring and identification system. In recent years, smart grids are of the greatest interest in power system research. One of the main features of smart grid is their self-healing, which can continuously carry out online self-evaluation, discover existing faults, and correct them immediately. The over-voltage smart monitoring-identification-suppression systems play a key role in the construction of self-healing grids. In this paper, eight kinds of common over-voltage are discussed and analyzed. The S-transform algorithm is used to extract features of over-voltage. Aiming at the main features of each kind of over-voltage, six different characteristic quantities are proposed. A well designed fuzzy expert system and a support vector machine are employed as the classifiers to build a two-step identification model. The accuracy of the identification system is verified by field records. Results show that this system is feasible and promising for real applications.
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