Faulty Line Selection Method Based on Comprehensive Dynamic Time Warping Distance in a Flexible Grounding System
A flexible grounding system is a system in which the neutral point of the power supply is grounded via the arc suppression coil in parallel with a low-resistance resistor. When operating normally or a temporary ground fault occurs, the arc suppression coil is used for grounding, whereas the small re...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-01-01
|
| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/15/2/471 |
| _version_ | 1827665839544860672 |
|---|---|
| author | Yu He Xinhui Zhang Wenhao Wu Jun Zhang Wenyuan Bai Aiyu Guo Yu Chen |
| author_facet | Yu He Xinhui Zhang Wenhao Wu Jun Zhang Wenyuan Bai Aiyu Guo Yu Chen |
| author_sort | Yu He |
| collection | DOAJ |
| description | A flexible grounding system is a system in which the neutral point of the power supply is grounded via the arc suppression coil in parallel with a low-resistance resistor. When operating normally or a temporary ground fault occurs, the arc suppression coil is used for grounding, whereas the small resistance is switched on when a permanent ground fault occurs. At present, the problem of low protection sensitivity when a high-resistance ground fault occurs in a flexible grounding system has not been solved yet. According to the characteristics of low waveform similarity between the faulty line and the non-faulty line when a single-phase grounding fault occurred, a new faulty line selection method based on a combination of Dynamic Time Warping (DTW) distance and the transient projection method is proposed in this paper. Firstly, the fault transient signal is extracted by a digital filter as a basis for faulty line selection. Secondly, the transient zero-sequence current of each line is projected onto the busbar transient zero-sequence voltage, and the projected DTW distance of each line is calculated. Finally, according to the calculation formula of waveform comprehensive similarity coefficient, the Comprehensive DTW (CDTW) distance is obtained, and the top three CDTW distance values are selected to determine the faulty line. If the maximum value is greater than the sum of the other two CDTW distance values, the line corresponding to the maximum value is judged as the faulty line; otherwise, it is judged as a busbar fault. The simulation results based on MATLAB/Simulink and field data test show that the method can accurately determine the faulty line under diverse fault conditions. |
| first_indexed | 2024-03-10T01:33:45Z |
| format | Article |
| id | doaj.art-9d404f33096a4222a7bdbd683906679d |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T01:33:45Z |
| publishDate | 2022-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-9d404f33096a4222a7bdbd683906679d2023-11-23T13:36:46ZengMDPI AGEnergies1996-10732022-01-0115247110.3390/en15020471Faulty Line Selection Method Based on Comprehensive Dynamic Time Warping Distance in a Flexible Grounding SystemYu He0Xinhui Zhang1Wenhao Wu2Jun Zhang3Wenyuan Bai4Aiyu Guo5Yu Chen6School of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, ChinaSchool of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, ChinaSchool of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, ChinaSchool of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, ChinaSchool of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, ChinaSchool of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, ChinaSchool of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, ChinaA flexible grounding system is a system in which the neutral point of the power supply is grounded via the arc suppression coil in parallel with a low-resistance resistor. When operating normally or a temporary ground fault occurs, the arc suppression coil is used for grounding, whereas the small resistance is switched on when a permanent ground fault occurs. At present, the problem of low protection sensitivity when a high-resistance ground fault occurs in a flexible grounding system has not been solved yet. According to the characteristics of low waveform similarity between the faulty line and the non-faulty line when a single-phase grounding fault occurred, a new faulty line selection method based on a combination of Dynamic Time Warping (DTW) distance and the transient projection method is proposed in this paper. Firstly, the fault transient signal is extracted by a digital filter as a basis for faulty line selection. Secondly, the transient zero-sequence current of each line is projected onto the busbar transient zero-sequence voltage, and the projected DTW distance of each line is calculated. Finally, according to the calculation formula of waveform comprehensive similarity coefficient, the Comprehensive DTW (CDTW) distance is obtained, and the top three CDTW distance values are selected to determine the faulty line. If the maximum value is greater than the sum of the other two CDTW distance values, the line corresponding to the maximum value is judged as the faulty line; otherwise, it is judged as a busbar fault. The simulation results based on MATLAB/Simulink and field data test show that the method can accurately determine the faulty line under diverse fault conditions.https://www.mdpi.com/1996-1073/15/2/471flexible grounding systemfaulty line selectionsingle-phase grounding faultComprehensive Dynamic Time Warping (CDTW) distancetransient projection method |
| spellingShingle | Yu He Xinhui Zhang Wenhao Wu Jun Zhang Wenyuan Bai Aiyu Guo Yu Chen Faulty Line Selection Method Based on Comprehensive Dynamic Time Warping Distance in a Flexible Grounding System Energies flexible grounding system faulty line selection single-phase grounding fault Comprehensive Dynamic Time Warping (CDTW) distance transient projection method |
| title | Faulty Line Selection Method Based on Comprehensive Dynamic Time Warping Distance in a Flexible Grounding System |
| title_full | Faulty Line Selection Method Based on Comprehensive Dynamic Time Warping Distance in a Flexible Grounding System |
| title_fullStr | Faulty Line Selection Method Based on Comprehensive Dynamic Time Warping Distance in a Flexible Grounding System |
| title_full_unstemmed | Faulty Line Selection Method Based on Comprehensive Dynamic Time Warping Distance in a Flexible Grounding System |
| title_short | Faulty Line Selection Method Based on Comprehensive Dynamic Time Warping Distance in a Flexible Grounding System |
| title_sort | faulty line selection method based on comprehensive dynamic time warping distance in a flexible grounding system |
| topic | flexible grounding system faulty line selection single-phase grounding fault Comprehensive Dynamic Time Warping (CDTW) distance transient projection method |
| url | https://www.mdpi.com/1996-1073/15/2/471 |
| work_keys_str_mv | AT yuhe faultylineselectionmethodbasedoncomprehensivedynamictimewarpingdistanceinaflexiblegroundingsystem AT xinhuizhang faultylineselectionmethodbasedoncomprehensivedynamictimewarpingdistanceinaflexiblegroundingsystem AT wenhaowu faultylineselectionmethodbasedoncomprehensivedynamictimewarpingdistanceinaflexiblegroundingsystem AT junzhang faultylineselectionmethodbasedoncomprehensivedynamictimewarpingdistanceinaflexiblegroundingsystem AT wenyuanbai faultylineselectionmethodbasedoncomprehensivedynamictimewarpingdistanceinaflexiblegroundingsystem AT aiyuguo faultylineselectionmethodbasedoncomprehensivedynamictimewarpingdistanceinaflexiblegroundingsystem AT yuchen faultylineselectionmethodbasedoncomprehensivedynamictimewarpingdistanceinaflexiblegroundingsystem |