access icon free Intelligent busbar protection scheme based on combination of support vector machine and S-transform

© The Institution of Engineering and Technology
Received 26/10/2016, Accepted 24/01/2017, Revised 11/01/2017, Published 21/02/2017

Differential protection is the main protective scheme of busbar in power systems but its operation degrades during current transformer (CT) saturation conditions. In this study, the busbar differential protection scheme is improved by the addition of a new feature extracted from differential current using S-transform analysis. S-transform as a powerful signal processing technique gives a complete visualisation of the signal in both time and frequency domains. The new extracted feature as well as the magnitude of the differential and restraint currents are utilised to increase the security of traditional busbar differential protection scheme. With the addition of this new feature, distinctive regions are created in the feature space which can be separated by an appropriate classifier. In this study, the well-known classifier, i.e. support vector machine is employed to effectively discriminate internal faults from external faults. To evaluate the performance of the proposed method, a part of Iranian 400-kV power system grid is simulated in the PSCAD/EMTDC environment. The transient behaviour of CTs during saturation conditions is simulated based on the precise Jiles–Atherton model. The obtained results justify the superiority of the proposed method in terms of speed and security even in noisy conditions.

Inspec keywords: time-domain analysis; power grids; power engineering computing; transforms; power system faults; power system security; support vector machines; power system protection; busbars; frequency-domain analysis

Other keywords: time domains; support vector machine; frequency domains; restraint currents; feature space; transient behaviour; busbar differential protection scheme security; Iranian power system grid; differential currents; Jiles-Atherton model; CT saturation conditions; S-transform analysis; current transformer; PSCAD environment; intelligent busbar protection scheme; signal processing technique; internal faults; EMTDC environment; SVM; external faults; voltage 400 kV

Subjects: Integral transforms; Power system protection; Mathematical analysis; Power engineering computing; Mathematical analysis; Knowledge engineering techniques; Integral transforms

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