论文标题
在多层2G-HTS冷介电导体中对AC损耗的实际预测
Practical Forecasting of AC Losses in Multi-layer 2G-HTS Cold Dielectric Conductors
论文作者
论文摘要
随着最新的设计和制造，轻巧和高工程电流密度超导电缆的设计和制造，需要在冷测量导体中预测AC-alsses的既定，快速且足够准确的计算模型，这对于增加电力电网运营商的投资信心是关键的。但是，验证此类模型并不是一件容易的事，这是因为一方面，对于大型电源电缆的实验结果的可用性较低，另一方面，涉及大量的2G-HTS磁带，其横截面纵横比阻碍了合理交付时间内模型的数值。因此，为了克服这一挑战，我们提出了一个详细的二维H模型，能够重现由数十2G-HTS磁带制成的多层功率电缆的实验测量的AC-alses。已经考虑了两种具有很高临界电流的电缆设计，第一个额定电流为1.7 ka临界电流，由五十4 mm宽度2G-HTS磁带组成，这些磁带在5个同心层中分成5个同心层，在圆柱前的前一层中缠绕，三个内层形成了24个磁带，由24个磁带屏蔽，由两层带有13个磁带。该电缆与尺寸尺寸的等效电缆形成鲜明对比，67个超导胶带额定为3.2 ka临界电流，其设计意味着在四个核心层中使用40个3毫米宽度的宽度分配的40个磁带，而在两个屏蔽层中分布的4毫米宽度为4 mm宽度。在这两种情况下，都发现了模拟和实验之间的显着相似之处，从而使对冷介电导体的AC损坏的可接受估计值，并提供了伤口磁带的局部电动力学的独特视图，其中屏蔽，磁化硬化和运输电源的机理可以在远程过程中共存。
With the recent progresses on the designing and manufacturing of lightweight and high engineering current density superconducting cables, the need for an established, fast, and sufficiently accurate computational model for the forecasting of AC-losses in cold-dielectric conductors, is pivotal for increasing the investment confidence of power grid operators. However, validating such models is not an easy task, this because on the one hand, there is a low availability of experimental results for large scale power cables and, on the other hand, there is a large number of 2G-HTS tapes involved whose cross-sectional aspect ratio hinders the numerical convergence of the models within reasonable delivery times. Thus, aiming to overcome this challenge, we present a detailed two-dimensional H-model capable to reproduce the experimentally measured AC-losses of multi-layer power cables made of tens of 2G-HTS tapes. Two cable designs with very high critical currents have been considered, the first rated at 1.7 kA critical current, consisting of fifty 4 mm width 2G-HTS tapes, these split in 5 concentric layers wound over a cylindrical former, with the three inner layers forming an arrangement of 24 tapes shielded by two further layers with 13 tapes each. This cable is contrasted with a size wise equivalent cable with 67 superconducting tapes rated at 3.2 kA critical current, whose design implies the use of 40 tapes of 3 mm width split within four core layers, and 27 tapes of 4 mm width distributed in two shielding layers. In both situations a remarkable resemblance between the simulations and experiments has been found, rendering to acceptable estimates of the AC-losses for cold dielectric conductors, and offering a unique view of the local electrodynamics of the wound tapes where the mechanisms of shielding, magnetization, and transport currents can coexist within the hysteretic process.
