Pilot protection for hybrid multi-terminal HVDC transmission lines based on Euclidean distance between differential current and distributed capacitance current
•Waveform characteristics of differential current and distributed capacitance current are discussed by mathematical expression.•A new principle of fault identification based on waveform similarity between differential current and distributed capacitor current is proposed.•A pilot protection method b...
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| Published in | Electric power systems research Vol. 224; p. 109752 |
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| Main Authors | , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier B.V
01.11.2023
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| Subjects | |
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| Abstract | •Waveform characteristics of differential current and distributed capacitance current are discussed by mathematical expression.•A new principle of fault identification based on waveform similarity between differential current and distributed capacitor current is proposed.•A pilot protection method based on Euclidean distance is proposed, which well adapts to the hybrid multi-terminal HVDC system and overcomes the shortcomings of time delay and slow action speed of traditional current differential protection, with high sensitivity and reliability, and does not depend on complicated calculation, strict synchronization, and precise line parameters.
Aiming at the influence of distributed capacitance on differential current in long HVDC transmission lines, the waveform characteristics of differential current and distributed capacitance current is investigated. It is discovered that the waveforms similarity between differential current and distributed capacitance current can effectively identify internal fault and external fault. On this basis, normalized Euclidean distance is adopted to extract the similarity features, and then a new principle of pilot protection for hybrid multi-terminal HVDC transmission lines based on Euclidean distance is proposed. Finally, extensive simulation tests on three-terminal bipolar Hybrid-MTDC transmission system built in PSCAD/ EMTDC show that the proposed protection can detect faults rapidly and accurately, does not depend on complicated calculation, strict data synchronization and precise line parameters, with high sensitivity and reliability. |
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| AbstractList | •Waveform characteristics of differential current and distributed capacitance current are discussed by mathematical expression.•A new principle of fault identification based on waveform similarity between differential current and distributed capacitor current is proposed.•A pilot protection method based on Euclidean distance is proposed, which well adapts to the hybrid multi-terminal HVDC system and overcomes the shortcomings of time delay and slow action speed of traditional current differential protection, with high sensitivity and reliability, and does not depend on complicated calculation, strict synchronization, and precise line parameters.
Aiming at the influence of distributed capacitance on differential current in long HVDC transmission lines, the waveform characteristics of differential current and distributed capacitance current is investigated. It is discovered that the waveforms similarity between differential current and distributed capacitance current can effectively identify internal fault and external fault. On this basis, normalized Euclidean distance is adopted to extract the similarity features, and then a new principle of pilot protection for hybrid multi-terminal HVDC transmission lines based on Euclidean distance is proposed. Finally, extensive simulation tests on three-terminal bipolar Hybrid-MTDC transmission system built in PSCAD/ EMTDC show that the proposed protection can detect faults rapidly and accurately, does not depend on complicated calculation, strict data synchronization and precise line parameters, with high sensitivity and reliability. |
| ArticleNumber | 109752 |
| Author | Chu, Beiyu Peng, Guangqiang Wang, Gang Liang, Yuansheng Li, Haifeng Zhang, Qixuan |
| Author_xml | – sequence: 1 givenname: Beiyu surname: Chu fullname: Chu, Beiyu organization: School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China – sequence: 2 givenname: Haifeng orcidid: 0000-0001-5696-8051 surname: Li fullname: Li, Haifeng email: lihf@scut.edu.cn organization: School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China – sequence: 3 givenname: Yuansheng surname: Liang fullname: Liang, Yuansheng organization: School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China – sequence: 4 givenname: Qixuan surname: Zhang fullname: Zhang, Qixuan organization: School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China – sequence: 5 givenname: Guangqiang surname: Peng fullname: Peng, Guangqiang organization: Electric Power Research Institute of EHV, CSG, Guangzhou 510663, China – sequence: 6 givenname: Gang surname: Wang fullname: Wang, Gang organization: School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China |
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| SubjectTerms | DC transmission line protection Differential current Distributed capacitance current Pilot protection Waveform similarity |
| Title | Pilot protection for hybrid multi-terminal HVDC transmission lines based on Euclidean distance between differential current and distributed capacitance current |
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