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CSEE Journal of Power and Energy Systems 2024, 10(1): 151-161 https://doi.org/10.17775/CSEEJPES.2021.07900
Regular Paper | Open Access | Issue | Published: 17 November 2023

Location of Asymmetric Ground Fault Using Virtual Injected Current Ratio and Two-stage Recovery Strategy in Distribution Networks

Show Author's Information Haiting Shan,  Luliang Zhang,  Q. H. Wu,  Mengshi Li( )
School of Electric Power Engineering, South China University of Technology (SCUT), Guangzhou 510641, China
Keywords:
Distribution networks, fault location, reconstruction accuracy, two-stage recovery, virtual injected current ratio
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Shan H, Zhang L, Wu QH, et al. Location of Asymmetric Ground Fault Using Virtual Injected Current Ratio and Two-stage Recovery Strategy in Distribution Networks. CSEE Journal of Power and Energy Systems, 2024, 10(1): 151-161. https://doi.org/10.17775/CSEEJPES.2021.07900
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Abstract Full text About this article

Sparse measurements challenge fault location in distribution networks. This paper proposes a method for asymmetric ground fault location in distribution networks with limited measurements. A virtual injected current vector is formulated to estimate the fault line, which can be reconstructed from voltage sags measured at a few buses using compressive sensing (CS). The relationship between the virtual injected current ratio (VICR) and fault position is deduced from circuit analysis to pinpoint the fault. Furthermore, a two-stage recovery strategy is proposed for improving reconstruction accuracy of the current vector, where two different sensing matrixes are utilized to improve the incoherence. The proposed method is validated in IEEE 34 node test feeder. Simulation results show asymmetric ground fault type, resistance, fault position and access of distributed generators (DGs) do not significantly influence performance of our method. In addition, it works effectively under various scenarios of noisy measurement and line parameter error. Validations on 134 node test feeders prove the proposed method is also suitable for systems with more complex structure.


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About this article

Location of Asymmetric Ground Fault Using Virtual Injected Current Ratio and Two-stage Recovery Strategy in Distribution Networks

Show Author's information Haiting Shan, Luliang Zhang, Q. H. Wu, Mengshi Li( )
School of Electric Power Engineering, South China University of Technology (SCUT), Guangzhou 510641, China

Abstract

Sparse measurements challenge fault location in distribution networks. This paper proposes a method for asymmetric ground fault location in distribution networks with limited measurements. A virtual injected current vector is formulated to estimate the fault line, which can be reconstructed from voltage sags measured at a few buses using compressive sensing (CS). The relationship between the virtual injected current ratio (VICR) and fault position is deduced from circuit analysis to pinpoint the fault. Furthermore, a two-stage recovery strategy is proposed for improving reconstruction accuracy of the current vector, where two different sensing matrixes are utilized to improve the incoherence. The proposed method is validated in IEEE 34 node test feeder. Simulation results show asymmetric ground fault type, resistance, fault position and access of distributed generators (DGs) do not significantly influence performance of our method. In addition, it works effectively under various scenarios of noisy measurement and line parameter error. Validations on 134 node test feeders prove the proposed method is also suitable for systems with more complex structure.

Keywords: Distribution networks, fault location, reconstruction accuracy, two-stage recovery, virtual injected current ratio

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Publication history

Received: 24 October 2021
Revised: 28 March 2022
Accepted: 12 May 2022
Published: 17 November 2023
Issue date: January 2024

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© 2021 CSEE.

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This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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