Pilot protection based on voltage and current correlation for DC lines in mesh DC grid without boundary
As the scale of DC grids expands, the converter will be connected with multiple outgoing lines. In this context, locating current-limiting reactors at the outlet of the converter can effectively balance the contradiction between current-limiting requirements and construction costs. However, the abse...
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Elsevier
2025-07-01
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| Series: | International Journal of Electrical Power & Energy Systems |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0142061525002741 |
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| author | Zhihui Dai Xu Shi |
| author_facet | Zhihui Dai Xu Shi |
| author_sort | Zhihui Dai |
| collection | DOAJ |
| description | As the scale of DC grids expands, the converter will be connected with multiple outgoing lines. In this context, locating current-limiting reactors at the outlet of the converter can effectively balance the contradiction between current-limiting requirements and construction costs. However, the absence of a clear line boundary poses challenges for DC line protection. In response, a setting-less line pilot protection is proposed for the mesh DC grid without boundary. First, through the analysis of measured impedance characteristics, it is found that for internal faults, the high-frequency voltage and high-frequency current on both ends of the line are negatively correlated. Whereas for external faults, there is at least one end of the line where the high-frequency voltage and high-frequency current are positively correlated. Then, a suitable high-pass filter is designed, and the cosine similarity is utilized to evaluate whether the filtered voltage and current waveforms display a similar trend of change, further providing a comprehensive protection scheme. Finally, numerous simulation results demonstrate that the proposed method exhibits strong endurance to fault resistance and noise environment. The proposed method remains applicable even when system parameters change and does not require complex setting. |
| format | Article |
| id | doaj-art-844c47320b394ffe8073c43dd37101ae |
| institution | Kabale University |
| issn | 0142-0615 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | International Journal of Electrical Power & Energy Systems |
| spelling | doaj-art-844c47320b394ffe8073c43dd37101ae2025-08-20T03:49:41ZengElsevierInternational Journal of Electrical Power & Energy Systems0142-06152025-07-0116811072310.1016/j.ijepes.2025.110723Pilot protection based on voltage and current correlation for DC lines in mesh DC grid without boundaryZhihui Dai0Xu Shi1Key Laboratory of Distributed Energy Storage and Microgrid of Hebei Province, North China Electric Power University, Baoding 071003, ChinaCorresponding author.; Key Laboratory of Distributed Energy Storage and Microgrid of Hebei Province, North China Electric Power University, Baoding 071003, ChinaAs the scale of DC grids expands, the converter will be connected with multiple outgoing lines. In this context, locating current-limiting reactors at the outlet of the converter can effectively balance the contradiction between current-limiting requirements and construction costs. However, the absence of a clear line boundary poses challenges for DC line protection. In response, a setting-less line pilot protection is proposed for the mesh DC grid without boundary. First, through the analysis of measured impedance characteristics, it is found that for internal faults, the high-frequency voltage and high-frequency current on both ends of the line are negatively correlated. Whereas for external faults, there is at least one end of the line where the high-frequency voltage and high-frequency current are positively correlated. Then, a suitable high-pass filter is designed, and the cosine similarity is utilized to evaluate whether the filtered voltage and current waveforms display a similar trend of change, further providing a comprehensive protection scheme. Finally, numerous simulation results demonstrate that the proposed method exhibits strong endurance to fault resistance and noise environment. The proposed method remains applicable even when system parameters change and does not require complex setting.http://www.sciencedirect.com/science/article/pii/S0142061525002741Mesh DC grids without boundaryPilot protectionFault characteristic analysisCorrelation discrimination |
| spellingShingle | Zhihui Dai Xu Shi Pilot protection based on voltage and current correlation for DC lines in mesh DC grid without boundary International Journal of Electrical Power & Energy Systems Mesh DC grids without boundary Pilot protection Fault characteristic analysis Correlation discrimination |
| title | Pilot protection based on voltage and current correlation for DC lines in mesh DC grid without boundary |
| title_full | Pilot protection based on voltage and current correlation for DC lines in mesh DC grid without boundary |
| title_fullStr | Pilot protection based on voltage and current correlation for DC lines in mesh DC grid without boundary |
| title_full_unstemmed | Pilot protection based on voltage and current correlation for DC lines in mesh DC grid without boundary |
| title_short | Pilot protection based on voltage and current correlation for DC lines in mesh DC grid without boundary |
| title_sort | pilot protection based on voltage and current correlation for dc lines in mesh dc grid without boundary |
| topic | Mesh DC grids without boundary Pilot protection Fault characteristic analysis Correlation discrimination |
| url | http://www.sciencedirect.com/science/article/pii/S0142061525002741 |
| work_keys_str_mv | AT zhihuidai pilotprotectionbasedonvoltageandcurrentcorrelationfordclinesinmeshdcgridwithoutboundary AT xushi pilotprotectionbasedonvoltageandcurrentcorrelationfordclinesinmeshdcgridwithoutboundary |