大功率AC输电用MgB2导线的数值模拟
Numerical modelling of MgB2 conductors for high power AC transmission
摘要：
由MgB 2超导体制成的电缆目前被探索为在AC体系中传输高电力的可行解决方案。为了与直流解决方案竞争，电缆需要具有可接受的交流损耗水平。在这篇文章中，我们讨论了设计一个足够低的交流损耗水平的电缆相关的主要方面。为此，我们进行有限元法（FEM）模拟，以确定电流和场分布，并计算这种电缆配置的交流损耗。对于2-5 kA（峰值）的电流容量，电力电缆由相对少量的MgB 2股组装而成。这种电缆的性能很大程度上取决于电流和场分布，而电流和场分布又受到超导部件的数量和布置以及支撑材料的磁特性的影响。数值模拟可以帮助测试不同的电缆配置，并为优化电缆设计提供重要见解。数值模型包括超导体的临界电流密度Jc（B）的场依赖性以及磁性材料的非线性特性。
英文摘要：
Cables made of MgB2 superconductors are currently explored as a viable solution for transporting high electrical power in the AC regime. In order to be competitive against the DC solution, the cables need to have an acceptable level of AC losses. In this contribution, we discuss the main aspects relevant for designing a cable with a sufficiently low AC loss level. To this end, we perform finite-element-method (FEM) simulations to determine the current and field distributions and calculate the AC losses of such cable configuration. For current capacities of 2-5 kA (peak), power cables are assembled from a relatively small number of MgB2 strands. The performance of such cables strongly depends on the current and field distributions, which are in turn influenced by the number and the arrangement of the superconducting components and also by the magnetic properties of supporting materials. Numerical simulations can help to test different cable configurations and provide important insights for optimizing the cable's design. The numerical model includes the field dependence of the superconductor's critical current density Jc(B) as well as the non-linear properties of magnetic materials.
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