Superconducting DC energy pipeline combines long-distanceelectricity and liquified natural gas transmission, which could improve the overall efficiency of the pipeline system and save construction space. The characteristics of superconducting DC energy pipelines with bipolar coaxial, double-core and partitioned structural layouts are analyzed and compared in this paper, which are significant for the selection of pipeline structure. The voltage levels are set as ±10 kV/±100 kV for electricity distribution and transmission applications, and the rated current is set as 1 kA. The simulation models of energy pipelines with each structural layout are established in order to evaluate the respective operation characteristics. The operation conditions of the steady state, the quench transient process under a short-circuited fault and the quench recovery transient process afterwards are analyzed in order to evaluate the stability and safety of the pipeline system. The comparison results illustrate the distinguishing features of each structural layout from various aspects. It is found that the double-core structure and the partitioned structure are the most suitable options at the voltage levels of ±10 kV and ±100 kV respectively.

中文翻译：

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不同双极结构布局的超导直流输能管道对比研究

超导直流能源管道将长距离输电与液化天然气相结合，可提高管道系统的整体效率，节省建设空间。本文分析比较了双极同轴、双芯和分区结构布局的超导直流能源管道的特点，对管道结构的选择具有重要意义。配电和输电应用的电压等级设置为±10 kV/±100 kV，额定电流设置为1 kA。建立了各种结构布局的能源管道的仿真模型，以评估各自的运行特性。稳态运行条件，分析了短路故障下的失超瞬态过程和之后的失超恢复瞬态过程，以评价管道系统的稳定性和安全性。比较结果从各个方面说明了每种结构布局的显着特征。结果表明，双芯结构和分区结构分别在±10 kV和±100 kV的电压水平下是最合适的选择。