Conductor design in bipolar superconducting DC energy pipelines
HUANG Weican, JIANG Xiaohua, XUE Peng, LI Xinyang, SHEN Zhidong, SUN Yuguang
State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
Abstract：Superconducting DC energy pipelines combine high temperature superconducting (HTS) DC transmission lines with long-distance liquefied natural gas (LNG) transmission lines where the flowing LNG acts as the refrigerant for the superconducting cable in the pipeline.This greatly increases the overall system energy transmission density and efficiency.The conductors then need to be carefully designed to ensure the safety and reliability of the high-capacity superconducting transmission system for the special operating conditions of superconducting DC energy pipelines.This study analyzed the critical current density degradations of the high temperature superconducting tapes influenced by the magnetic fields at the pipeline operating temperature and the effects of the copper former during short-circuit faults in the superconducting cable.The analysis was then used to optimize the conductor design of a ±10 kV/1 kA bipolar coaxial superconducting DC energy pipeline.The results indicate that at least 12 HTS tapes are required for a single pole and the minimum cross-sectional area of the copper former is 1.48×10-4 m2.The thermal stability of the superconducting DC energy pipeline during a short-circuit fault was then verified by finite element simulations.The conductor design method presented in this paper is also applicable to the design of superconducting DC energy pipelines with various voltage and current levels and pipeline structures.
[1] ZAHEDI A. A review of drivers, benefits, and challenges in integrating renewable energy sources into electricity grid[J]. Renewable and Sustainable Energy Reviews, 2011, 15(9):4775-4779. [2] FLOURENTZOU N, AGELIDIS V G, DEMETRIADES G D. VSC-based HVDC power transmission systems:An overview[J]. IEEE Transactions on Power Electronics, 2009, 24(3):592-602. [3] VENKATARAMANAN G, JOHNSON B K. A superconducting DC transmission system based on VSC transmission technologies[J]. IEEE Transactions on Appiled Superconductivity, 2003, 13(2):1922-1925. [4] MORANDI A. HTS dc transmission and distribution:Concepts, applications and benefits[J]. Superconductor Science and Technology, 2015, 28(12):123001. [5] KOPYLOV S, SYTNIKOV V, BEMERT S, et al. HTS DC transmission line for megalopolis grid development[C]//Proceedings of the 11th European Conference on Applied Superconductivity (EUCAS2013). Genoa, Italy:IOP Publishing, 2014, 507:032047. [6] ZHANG Y, TAN H B, LI Y Z, et al. Feasibility analysis and application design of a novel long-distance natural gas and electricity combined transmission system[J]. Energy, 2014, 77:710-719. [7] QIU Q Q, ZHANG G M, XIAO L Y, et al. General design of±100 kV/1kA energy pipeline for electric power and LNG transportation[J]. Cryogenics, 2020, 109:103120. [8] SIM K, KIM S, CHO J, et al. Design and current transporting characteristics of 80 kV direct current high temperature superconducting cable core[J]. IEEE Transactions on Applied Superconductivity, 2013, 23(3):5401804. [9] SYTNIKOV V E, BEMERT S E, IVANOV Y V, et al. HTS DC cable line project:On-going activities in Russia[J]. IEEE Transactions on Applied Superconductivity, 2013, 23(3):5401904. [10] YAMAGUCHI S, KAWAHARA T, HAMABE M, et al. Experiment of 200-meter superconducting DC cable system in Chubu University[J]. Physica C:Superconductivity and its Applications, 2011, 471(21-22):1300-1303. [11] XIAO L Y, DAI S T, LIN L Z, et al. Development of a 10 kA HTS DC power cable[J]. IEEE Transactions on Applied Superconductivity, 2012, 22(3):5800404. [12] ZHANG D, DAI S T, ZHANG F Y, et al. Design research on the conductor of 10 kA class HTS DC power cable[J]. Cryogenics, 2012, 52(12):725-729. [13] 徐靖捷,莫思铭,蔡渊,等.双极同轴高温超导直流电缆通电导体设计[J].低温与超导, 2019, 47(10):40-44, 54. XU J J, MO S M, CAI Y, et al. Design of bipolar coaxial HTS DC cable[J]. Cryogenics and Superconductivity, 2019, 47(10):40-44, 54.(in Chinese) [14] 林玉宝,林良真,高智远,等. 2000安高温超导输电电缆的研制[J].高技术通讯, 2001, 11(10):95-99. LIN Y B, LIN L Z, GAO Z Y, et al. Development of a 2000A HTS transmission power cable[J]. High Technology Letters, 2001, 11(10):95-99.(in Chinese) [15] HUANG W C, JIANG X H, XUE P, et al. Electromagnetic analysis of HTS DC cables based on critical state model[J]. IEEE Transactions on Applied Superconductivity, 2021, 31(5):4803005. [16] HAJIRI G, BERGER K, DORGET R, et al. Thermal and electromagnetic design of DC HTS cables for the future french railway network[J]. IEEE Transactions on Applied Superconductivity, 2021, 31(5):5400208. [17] 郭伟,李卫国,丘明,等.单通道冷绝缘高温超导电缆铜骨架的设计计算[J].低温与超导, 2013, 41(8):35-39. GUO W, LI W G, QIU M, et al. Calculation and design of single cold dielectric HTS cable's copper former[J]. Cryogenics and Superconductivity, 2013, 41(8):35-39.(in Chinese) [18] YANG T H, LI W X, XIN Y, et al. Research on current carrying capacity of Bi-2223/Ag superconducting tape in the temperature range of 75-105 K[J]. Physica C:Superconductivity and Its Applications, 2021, 582:1353825. [19] GRILLI F, SIROIS F, ZERMEÑO V M R, et al. Self-consistent modeling of the IC of HTS devices:How accurate do models really need to be?[J]. IEEE Transactions on Applied Superconductivity, 2014, 24(6):8000508. [20] 韩亮,白小会,陈波,等.张北±500kV柔性直流电网换流站控制保护系统设计[J].电力建设, 2017, 38(3):42-47. HAN L, BAI X H, CHEN B, et al. Control and protection system design of Zhangbei±500 kV converter station in VSC-HVDC power grid[J]. Electric Power Construction, 2017, 38(3):42-47.(in Chinese) [21] 时伯年,李岩,孙刚,等.基于快速重合闸的多端直流配电网极间故障隔离恢复策略[J].电力系统保护与控制, 2019, 47(8):88-95. SHI B N, LI Y, SUN G, et al. Fault isolation recovery strategy for multi-terminal DC distribution network based on DC breaker reclosing[J]. Power System Protection and Control, 2019, 47(8):88-95.(in Chinese) [22] 王渝红,傅云涛,曾琦,等.柔性直流电网故障保护关键技术研究综述[J].高电压技术, 2019, 45(8):2362-2374. WANG Y H, FU Y T, ZENG Q, et al. Review on key techniques for fault protection of flexible DC grids[J]. High Voltage Engineering, 2019, 45(8):2362-2374.(in Chinese) [23] 戴志辉,葛红波, CROSSLEY P,等.柔性直流配电网故障识别与隔离策略综述[J].华北电力大学学报, 2017, 44(4):19-28. DAI Z H, GE H B, CROSSLEY P, et al. An overview on fault detection and isolation strategies of flexible DC distribution networks[J]. Journal of North China Electric Power University, 2017, 44(4):19-28.(in Chinese) [24] CAMPBELL A M, EVETTS J E. Critical currents in superconductors[M]. London:Taylor and Francis, 1972. [25] BEAN C P. Magnetization of high-field superconductors[J]. Reviews of Modern Physics, 1964, 36(1):31-39. [26] MORANDI A, FABBRI M. A unified approach to the power law and the critical state modeling of superconductors in 2D[J]. Superconductor Science and Technology, 2015, 28(2):024004. [27] YANG J, FLETCHER J E, O'REILLY J. Short-circuit and ground fault analyses and location in VSC-based DC network cables[J]. IEEE transactions on Industrial Electronics, 2012, 59(10):3827-3837.
2022, Vol. 62 
