Multi-Frequency bands based Pole-to-Ground fault detection method for MMC-Based radial DC distribution systems

Yang, Changqing; Lin, Shuyue; Guo, Moufa

Abstract

In a small-current grounding system, the pole-to-ground fault may cause the voltage drop in the fault pole and the voltage rise in the other poles. In flexible DC distribution systems, Severe voltage variation may shorten the insulation lifetime of the equipment, which leads to great concerns on the safety issue. In addition, the existence of high transition resistance degrades the accuracy of fault detection methods, thus further affecting the reliability of the system. Therefore, it is essential to explore an advanced technology for faulty feeder detection. This study proposes a faulty feeder detection method based on the characteristics of transient zero-mode current (TZMC) in multi-frequency bands. The change rate of zero-mode voltage is applied as the protection activation criterion. Then, the characteristic matrix is constructed via computing the fuzzy entropy of TZMC in each frequency band. Finally, the faulty feeder can be identified by conducting fuzzy C-means on the characteristic matrix. This proposed method is tested through simulations on the PSCAD/EMTDC platform, which successfully demonstrates its outstanding adaptability, reliability, and accuracy.

Citation

Yang, C., Lin, S., & Guo, M. (2022). Multi-Frequency bands based Pole-to-Ground fault detection method for MMC-Based radial DC distribution systems. International Journal of Electrical Power & Energy Systems, 141, Article 108250. https://doi.org/10.1016/j.ijepes.2022.108250

• Journal Article Type: Article
• Acceptance Date: Apr 11, 2022
• Online Publication Date: Apr 21, 2022
• Publication Date: 2022-10
• Deposit Date: Apr 29, 2022
• Publicly Available Date: Apr 22, 2023
• Journal: International Journal of Electrical Power & Energy Systems
• Print ISSN: 0142-0615
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 141
• Article Number: 108250
• DOI: https://doi.org/10.1016/j.ijepes.2022.108250
• Keywords: Faulty feeder detection; Multi-frequency bands; Pole-to-ground fault; Radial DC distribution systems; Transient zero-mode current
• Public URL: https://hull-repository.worktribe.com/output/3983671
• Additional Information: This article is maintained by: Elsevier; Article Title: Multi-Frequency bands based Pole-to-Ground fault detection method for MMC-Based radial DC distribution systems; Journal Title: International Journal of Electrical Power & Energy Systems; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.ijepes.2022.108250; Content Type: article; Copyright: © 2022 Elsevier Ltd. All rights reserved.