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Single-ended Protection Scheme for Hybrid DC Transmission Lines Considering Boundary Re-fraction Coefficients:Taking the Wudongde Hybrid DC Project as an Example
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Chuan-jian WU1, 2, Cong-cong LI1, 2, Yan-qi HOU1, 2, Yan ZHANG1, 2, Xiao-dong ZHANG1, 2, Da-hai ZHANG3
Science Technology and Engineering | 2025, 25(18) : 7659 - 7667
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Science Technology and Engineering | 2025, 25(18): 7659-7667
• Papers·Electrical Technology •
Single-ended Protection Scheme for Hybrid DC Transmission Lines Considering Boundary Re-fraction Coefficients:Taking the Wudongde Hybrid DC Project as an Example
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Chuan-jian WU1, 2, Cong-cong LI1, 2, Yan-qi HOU1, 2, Yan ZHANG1, 2, Xiao-dong ZHANG1, 2, Da-hai ZHANG3
Affiliations
  • 1 State Grid Shandong Electric Power Research Institute, Jinan 250002, China
  • 2 State Grid Shandong Electric Power Company, Jinan 250001, China
  • 3 School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Published: 2025-06-28 doi: 10.12404/j.issn.1671-1815.2405178
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The hybrid DC transmission system has problems such as inconsistent boundary components, inconsistent fault response characteristics, difficult resolution of high resistance fault effects, and low accuracy in identifying near end faults, which reduces the reliability of protection schemes. Therefore, the phase characteristics of the regional refractive index of the hybrid DC transmission system were analyzed for the first time, and a single ended protection scheme suitable for hybrid boundaries was proposed based on this. Firstly, establish a hybrid DC transmission system model and analyze the traveling wave transmission characteristics of different fault types. Subsequently, the fault areas of the hybrid DC transmission system were divided, and the refractive index expressions and phase frequency characteristics of the areas were derived separately. Finally, a single ended protection scheme based on a specific frequency refractive index is proposed and its performance is tested. The test results show that the proposed protection scheme not only has the speed of traditional protection schemes, but also has better resistance to high impedance faults, noise interference, and other abilities.

hybrid DC transmission  /  line protection  /  single-ended protection  /  near-end fault  /  fault resistance  /  refraction factor
Chuan-jian WU, Cong-cong LI, Yan-qi HOU, Yan ZHANG, Xiao-dong ZHANG, Da-hai ZHANG. Single-ended Protection Scheme for Hybrid DC Transmission Lines Considering Boundary Re-fraction Coefficients:Taking the Wudongde Hybrid DC Project as an Example[J]. Science Technology and Engineering, 2025 , 25 (18) : 7659 -7667 . DOI: 10.12404/j.issn.1671-1815.2405178
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Year 2025 volume 25 Issue 18
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Article Info
doi: 10.12404/j.issn.1671-1815.2405178
  • Receive Date：2024-07-10
  • Online Date：2025-12-17
  • Published：2025-06-28
Article Data
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History
  • Received：2024-07-10
  • Revised：2025-03-19
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Affiliations
    1 State Grid Shandong Electric Power Research Institute, Jinan 250002, China
    2 State Grid Shandong Electric Power Company, Jinan 250001, China
    3 School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
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多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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