A flexible arc suppression method for single-line-to-ground faults adaptive to transition resistance variations using cascaded H-bridge converters

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Zhao, Guo-Jun and Guo, Mou-Fa and Zhang, Bin-Long and Zheng, Ze-Yin and Hong, Qiteng (2026) A flexible arc suppression method for single-line-to-ground faults adaptive to transition resistance variations using cascaded H-bridge converters. IEEE Transactions on Industrial Electronics. ISSN 0278-0046 (https://doi.org/10.1109/tie.2026.3654811)

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Abstract

Conventional flexible arc suppression methods suffer from large residual currents under low-resistance conditions and prolonged transient suppression times under high-resistance conditions, which adversely affect the reliability of arc suppression. To address these issues, this article proposes a flexible arc suppression method with adaptive transition resistance variation. Upon fault occurrence, the method first employs a current-type flexible arc suppression approach to reduce the risk of increased fault point currents caused by uncertainties in single-line-to-ground faults conditions. Subsequently, based on the relationship between the transient decay characteristics of zero-sequence voltage during fault suppression and the transition resistance in the current-type approach, an adaptive switching criterion for transition resistance variation is established. Finally, the reference values of the flexible arc suppression method are automatically adjusted according to transition resistance and transient time threshold criteria. Under low-resistance conditions, the method switches to an adaptive line impedance voltage-drop improved flexible current arc suppression strategy to mitigate residual current issues caused by voltage drop. Under high-resistance conditions, it switches to a voltage-type flexible arc suppression strategy based on transient time thresholds to shorten the transient fault suppression time and improve arc quenching speed. PSCAD/EMTDC simulations and physical experiments verify the correctness and effectiveness of the proposed method.

ORCID iDs

Zhao, Guo-Jun, Guo, Mou-Fa, Zhang, Bin-Long, Zheng, Ze-Yin and Hong, Qiteng ORCID logoORCID: https://orcid.org/0000-0001-9122-1981;
CORE (COnnecting REpositories)