Abstract There are two main obstacles in front of the development of high temperature superconducting (HTS) conductors for electrical power network applications; tape price and cooling cost. In order to reduce cooling cost, it is vital to evaluate AC transport current loss of the tapes precisely and then reduce it by some design innovations. In addition, AC transport current loss in HTS materials is a critical design variable for large-scale power network applications such as HTS transformers, superconducting fault current limiters, and power cables, since they are continuously carrying the network/load current during their operating life. In existing power network, harmonic production sources are commonly used and thus, currents are distorted. Therefore, the effect of nonsinusoidal current on the critical apparatus in the network such as transformer must be studied. In this paper, AC transport current loss of a single-turn 2G YBCO HTS coil has been modelled and numerically calculated under nonsinusoidal transport current using finite element method. Furthermore, influence of dependency of critical current density to magnetic field on the AC transport current loss of HTS coil when carries distorted currents has been considered. It has been observed that nonsinusoidal current causes excessive losses in HTS coil. On the other hand, a case study on an HTS transformer supplying non-linear load with harmonic currents has been considered to study the loss increment as well as heat load change. It is been observed that current harmonics increases the AC loss, and heat load of transformer and decreases the efficiency, consequently.

中文翻译：

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场相关临界电流对提供非线性负载的超导变压器高温超导线圈谐波交流损耗分析的影响

摘要 发展用于电网应用的高温超导（HTS）导体面临两个主要障碍：磁带价格和冷却成本。为了降低冷却成本，精确评估磁带的交流传输电流损耗，然后通过一些设计创新来减少它是至关重要的。此外，HTS 材料中的交流传输电流损耗是大型电力网络应用（例如 HTS 变压器、超导故障限流器和电力电缆）的关键设计变量，因为它们在其使用寿命期间持续承载网络/负载电流. 在现有电网中，普遍使用谐波产生源，从而导致电流失真。所以，必须研究非正弦电流对网络中关键设备（如变压器）的影响。在本文中，使用有限元方法对单匝 2G YBCO HTS 线圈在非正弦传输电流下的交流传输电流损耗进行了建模和数值计算。此外，还考虑了临界电流密度对磁场的依赖性对 HTS 线圈在承载畸变电流时的交流传输电流损耗的影响。已经观察到非正弦电流会导致 HTS 线圈中的过度损耗。另一方面，一个 HTS 变压器为非线性负载提供谐波电流的案例研究已被考虑用于研究损耗增量以及热负载变化。据观察，电流谐波会增加交流损耗，