An active grounding fault line selection method for DC distribution network based on waveform correlation
The fault characteristics of direct current (DC) distribution network with small current grounding mode are inconspicuous when single-pole grounding fault occurs. In order to accurately and reliably select the fault line, a grounding fault selection method based on the injected signal waveform corre...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | zho |
| Published: |
Editorial Department of Electric Power Engineering Technology
2023-05-01
|
| Series: | 电力工程技术 |
| Subjects: | |
| Online Access: | https://www.epet-info.com/dlgcjsen/article/abstract/220331429 |
| _version_ | 1827941140268056576 |
|---|---|
| author | WANG Chenqing CHEN Shi QI Beibei KONG Xiangping LI Peng GAO Lei |
| author_facet | WANG Chenqing CHEN Shi QI Beibei KONG Xiangping LI Peng GAO Lei |
| author_sort | WANG Chenqing |
| collection | DOAJ |
| description | The fault characteristics of direct current (DC) distribution network with small current grounding mode are inconspicuous when single-pole grounding fault occurs. In order to accurately and reliably select the fault line, a grounding fault selection method based on the injected signal waveform correlation is proposed. Firstly, a predesigned additional control strategy is applied to the modular multilevel converter (MMC) of the DC distribution network to achieve the detection signal injection. Then, in combination with the zero-mode network, the fault characteristics are as follows. The specific frequency zero-mode current flow at the beginning of each sound feeder are same, which are opposite to zero-mode current flow at the beginning of the faulty feeder. Finally, based on this fault characteristic, the fault selection criterion is designed, and the Pearson correlation coefficient is introduced to compare the correlation between the normalized zero-mode current of each feeder and the total normalized zero-mode current. The fault selection is completed based on the characteristics that the correlation coefficient of the sound feeder is close to 1 and the correlation coefficient of the faulty feeder is close to -1. The simulation results show that the proposed method can reliably identify single-pole grounding fault occurring at any location on the bus or each feeder under high-resistance grounding fault. |
| first_indexed | 2024-03-13T09:31:47Z |
| format | Article |
| id | doaj.art-cac76fcfc3ca4d0cbcdd7686b1379893 |
| institution | Directory Open Access Journal |
| issn | 2096-3203 |
| language | zho |
| last_indexed | 2024-03-13T09:31:47Z |
| publishDate | 2023-05-01 |
| publisher | Editorial Department of Electric Power Engineering Technology |
| record_format | Article |
| series | 电力工程技术 |
| spelling | doaj.art-cac76fcfc3ca4d0cbcdd7686b13798932023-05-26T00:26:41ZzhoEditorial Department of Electric Power Engineering Technology电力工程技术2096-32032023-05-0142321010.12158/j.2096-3203.2023.03.001220331429An active grounding fault line selection method for DC distribution network based on waveform correlationWANG Chenqing0CHEN Shi1QI Beibei2KONG Xiangping3LI Peng4GAO Lei5State Grid Jiangsu Electric Power Co., Ltd. Research Institute, Nanjing 211103, ChinaState Grid Jiangsu Electric Power Co., Ltd. Research Institute, Nanjing 211103, ChinaState Grid Jiangsu Electric Power Co., Ltd. Research Institute, Nanjing 211103, ChinaState Grid Jiangsu Electric Power Co., Ltd. Research Institute, Nanjing 211103, ChinaState Grid Jiangsu Electric Power Co., Ltd. Research Institute, Nanjing 211103, ChinaState Grid Jiangsu Electric Power Co., Ltd. Research Institute, Nanjing 211103, ChinaThe fault characteristics of direct current (DC) distribution network with small current grounding mode are inconspicuous when single-pole grounding fault occurs. In order to accurately and reliably select the fault line, a grounding fault selection method based on the injected signal waveform correlation is proposed. Firstly, a predesigned additional control strategy is applied to the modular multilevel converter (MMC) of the DC distribution network to achieve the detection signal injection. Then, in combination with the zero-mode network, the fault characteristics are as follows. The specific frequency zero-mode current flow at the beginning of each sound feeder are same, which are opposite to zero-mode current flow at the beginning of the faulty feeder. Finally, based on this fault characteristic, the fault selection criterion is designed, and the Pearson correlation coefficient is introduced to compare the correlation between the normalized zero-mode current of each feeder and the total normalized zero-mode current. The fault selection is completed based on the characteristics that the correlation coefficient of the sound feeder is close to 1 and the correlation coefficient of the faulty feeder is close to -1. The simulation results show that the proposed method can reliably identify single-pole grounding fault occurring at any location on the bus or each feeder under high-resistance grounding fault.https://www.epet-info.com/dlgcjsen/article/abstract/220331429direct current (dc) distribution networkmodular multilevel converte (mmc)line selection of small current grounding faultinjected signalzero-mode networknormalized currentpearson correlation coefficient |
| spellingShingle | WANG Chenqing CHEN Shi QI Beibei KONG Xiangping LI Peng GAO Lei An active grounding fault line selection method for DC distribution network based on waveform correlation 电力工程技术 direct current (dc) distribution network modular multilevel converte (mmc) line selection of small current grounding fault injected signal zero-mode network normalized current pearson correlation coefficient |
| title | An active grounding fault line selection method for DC distribution network based on waveform correlation |
| title_full | An active grounding fault line selection method for DC distribution network based on waveform correlation |
| title_fullStr | An active grounding fault line selection method for DC distribution network based on waveform correlation |
| title_full_unstemmed | An active grounding fault line selection method for DC distribution network based on waveform correlation |
| title_short | An active grounding fault line selection method for DC distribution network based on waveform correlation |
| title_sort | active grounding fault line selection method for dc distribution network based on waveform correlation |
| topic | direct current (dc) distribution network modular multilevel converte (mmc) line selection of small current grounding fault injected signal zero-mode network normalized current pearson correlation coefficient |
| url | https://www.epet-info.com/dlgcjsen/article/abstract/220331429 |
| work_keys_str_mv | AT wangchenqing anactivegroundingfaultlineselectionmethodfordcdistributionnetworkbasedonwaveformcorrelation AT chenshi anactivegroundingfaultlineselectionmethodfordcdistributionnetworkbasedonwaveformcorrelation AT qibeibei anactivegroundingfaultlineselectionmethodfordcdistributionnetworkbasedonwaveformcorrelation AT kongxiangping anactivegroundingfaultlineselectionmethodfordcdistributionnetworkbasedonwaveformcorrelation AT lipeng anactivegroundingfaultlineselectionmethodfordcdistributionnetworkbasedonwaveformcorrelation AT gaolei anactivegroundingfaultlineselectionmethodfordcdistributionnetworkbasedonwaveformcorrelation AT wangchenqing activegroundingfaultlineselectionmethodfordcdistributionnetworkbasedonwaveformcorrelation AT chenshi activegroundingfaultlineselectionmethodfordcdistributionnetworkbasedonwaveformcorrelation AT qibeibei activegroundingfaultlineselectionmethodfordcdistributionnetworkbasedonwaveformcorrelation AT kongxiangping activegroundingfaultlineselectionmethodfordcdistributionnetworkbasedonwaveformcorrelation AT lipeng activegroundingfaultlineselectionmethodfordcdistributionnetworkbasedonwaveformcorrelation AT gaolei activegroundingfaultlineselectionmethodfordcdistributionnetworkbasedonwaveformcorrelation |