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Deep learning for high-impedance fault detection and classification: transformer-CNN

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Abstract

High-impedance faults (HIFs) exhibit low current amplitude and highly diverse characteristics, which make them difficult to be detected by conventional overcurrent relays. Various machine learning (ML) techniques have been proposed to detect and classify HIFs; however, these approaches are not reliable in presence of diverse HIF and non-HIF conditions and, moreover, rely on resource-intensive signal processing techniques. Consequently, this paper proposes a novel HIF detection and classification approach based on a state-of-the-art deep learning model, the transformer network, stacked with the Convolutional neural network (CNN). While the transformer network learns the complex HIF pattern in the data, the CNN enhances the generalization to provide robustness against noise. A kurtosis analysis is employed to prevent false detection of non-fault disturbances (e.g., capacitor and load switching) and nonlinear loads as HIFs. The performance of the proposed HIF detection and classification approach is evaluated using the IEEE 13-node test feeder. The results demonstrate that the proposed protection method reliably detects and classifies HIFs, is robust against noise, and outperforms the state-of-the-art techniques.

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Funding

This research has been supported by NSERC under grants RGPIN-2018-06222 and RGPIN2017-04772.

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Authors and Affiliations

  1. Department of Electrical and Computer Engineering, The University of Western Ontario, 1151 Richmond St, London, Ontario, N6A 3K7, Canada

    Khushwant Rai, Farnam Hojatpanah, Firouz Badrkhani Ajaei & Katarina Grolinger

  2. Department of Energy Technology, Aalborg University, Fredrik Bajers Vej 7K, 9220, Aalborg Øst, Denmark

    Josep M. Guerrero

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  1. Khushwant Rai
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  2. Farnam Hojatpanah
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  3. Firouz Badrkhani Ajaei
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  5. Katarina Grolinger
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Correspondence to Katarina Grolinger.

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Rai, K., Hojatpanah, F., Ajaei, F.B. et al. Deep learning for high-impedance fault detection and classification: transformer-CNN. Neural Comput & Applic 34, 14067–14084 (2022). https://doi.org/10.1007/s00521-022-07219-z

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