Fault Characteristic Analysis and a Novel Pilot Protection Scheme for Pole-to-Ground Fault in Flexible DC Distribution Network
Due to the pseudo-bipolar structure of the flexible DC distribution network, the short-circuit current caused by a pole-to-ground fault is weak. The fault characteristics, particularly the steady-state fault characteristics, are not prominent. Therefore, pole-to-ground fault diagnosis and protection...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IEEE
2023-01-01
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| Series: | IEEE Access |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/10184438/ |
| _version_ | 1797772589659062272 |
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| author | Hao Qi Wei Chen Zhenlan Dou Jiexiang Han Pei Sun Zhe Zhang Xianggen Yin |
| author_facet | Hao Qi Wei Chen Zhenlan Dou Jiexiang Han Pei Sun Zhe Zhang Xianggen Yin |
| author_sort | Hao Qi |
| collection | DOAJ |
| description | Due to the pseudo-bipolar structure of the flexible DC distribution network, the short-circuit current caused by a pole-to-ground fault is weak. The fault characteristics, particularly the steady-state fault characteristics, are not prominent. Therefore, pole-to-ground fault diagnosis and protection have become more challenging. This paper theoretically studies the short-circuit current characteristics of pole-to-ground fault in the flexible DC distribution network, derives the analytical expression of the short-circuit current, and analyzes the directional characteristics. Then, a novel pilot protection scheme based on fault direction comparison is proposed. This scheme compares the positive and negative half-wave integral values of the short-circuit current fault components to judge the fault direction. The fault directions on both sides of the feeder are obtained through the pilot protection channel, thereby distinguishing internal and external faults. The simulation results show that the proposed scheme can reliably identify the faulty feeder and has an excellent ability to perform with high transition resistance. Moreover, the scheme does not require sampling synchronization, which is easy to be applied in engineering. |
| first_indexed | 2024-03-12T21:54:05Z |
| format | Article |
| id | doaj.art-5d9490a9722749089f4291c5d2940885 |
| institution | Directory Open Access Journal |
| issn | 2169-3536 |
| language | English |
| last_indexed | 2024-03-12T21:54:05Z |
| publishDate | 2023-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj.art-5d9490a9722749089f4291c5d29408852023-07-25T23:00:19ZengIEEEIEEE Access2169-35362023-01-0111740717408710.1109/ACCESS.2023.329589610184438Fault Characteristic Analysis and a Novel Pilot Protection Scheme for Pole-to-Ground Fault in Flexible DC Distribution NetworkHao Qi0https://orcid.org/0000-0003-2473-1601Wei Chen1https://orcid.org/0000-0002-2153-2693Zhenlan Dou2Jiexiang Han3https://orcid.org/0000-0001-8221-2565Pei Sun4Zhe Zhang5Xianggen Yin6https://orcid.org/0000-0002-1030-4708School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, ChinaSchool of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, ChinaState Grid Shanghai Municipal Electric Power Company, Shanghai, ChinaSchool of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, ChinaState Grid Shanghai Electric Power Research Institute, Shanghai, ChinaSchool of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, ChinaSchool of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, ChinaDue to the pseudo-bipolar structure of the flexible DC distribution network, the short-circuit current caused by a pole-to-ground fault is weak. The fault characteristics, particularly the steady-state fault characteristics, are not prominent. Therefore, pole-to-ground fault diagnosis and protection have become more challenging. This paper theoretically studies the short-circuit current characteristics of pole-to-ground fault in the flexible DC distribution network, derives the analytical expression of the short-circuit current, and analyzes the directional characteristics. Then, a novel pilot protection scheme based on fault direction comparison is proposed. This scheme compares the positive and negative half-wave integral values of the short-circuit current fault components to judge the fault direction. The fault directions on both sides of the feeder are obtained through the pilot protection channel, thereby distinguishing internal and external faults. The simulation results show that the proposed scheme can reliably identify the faulty feeder and has an excellent ability to perform with high transition resistance. Moreover, the scheme does not require sampling synchronization, which is easy to be applied in engineering.https://ieeexplore.ieee.org/document/10184438/Fault characteristicsfault direction judgmentflexible DC distribution networkpilot protectionpole-to-ground fault |
| spellingShingle | Hao Qi Wei Chen Zhenlan Dou Jiexiang Han Pei Sun Zhe Zhang Xianggen Yin Fault Characteristic Analysis and a Novel Pilot Protection Scheme for Pole-to-Ground Fault in Flexible DC Distribution Network IEEE Access Fault characteristics fault direction judgment flexible DC distribution network pilot protection pole-to-ground fault |
| title | Fault Characteristic Analysis and a Novel Pilot Protection Scheme for Pole-to-Ground Fault in Flexible DC Distribution Network |
| title_full | Fault Characteristic Analysis and a Novel Pilot Protection Scheme for Pole-to-Ground Fault in Flexible DC Distribution Network |
| title_fullStr | Fault Characteristic Analysis and a Novel Pilot Protection Scheme for Pole-to-Ground Fault in Flexible DC Distribution Network |
| title_full_unstemmed | Fault Characteristic Analysis and a Novel Pilot Protection Scheme for Pole-to-Ground Fault in Flexible DC Distribution Network |
| title_short | Fault Characteristic Analysis and a Novel Pilot Protection Scheme for Pole-to-Ground Fault in Flexible DC Distribution Network |
| title_sort | fault characteristic analysis and a novel pilot protection scheme for pole to ground fault in flexible dc distribution network |
| topic | Fault characteristics fault direction judgment flexible DC distribution network pilot protection pole-to-ground fault |
| url | https://ieeexplore.ieee.org/document/10184438/ |
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