基于COMSOL的超导带材交流损耗仿真分析

Simulation and analysis of AC loss in HTS strip based on COMSOL

推导了求解交流损耗H方程法的数值计算公式,利用COMSOL Multiphysics有限元仿真软件PDE模块建立单根超导带材仿真模型,并介绍模型参数、网格剖分和物理场设置等流程和细节,系统分析不同幅值交流传输电流下的磁场分布和交流损耗。仿真结果显示,磁场强度较大的位置在超导带材的两端,并向中间区域逐渐减小。随着通入交流传输电流的幅值增加,超导带材内部及周围空气的磁场强度、磁场穿透深度和交流损耗也有了明显的增加。通过二维与三维仿真结果对比分析,证实三维仿真设置的正确性和结果的可靠性。

A numerical calculation of H equation to solve AC loss was deduced,the two-dimensional and three-dimensional simulation models of the second generation(2 G)high temperature superconducting(HTS)strip were established by COMSOL Multiphysics of PDE.The process and details of model parameters,the grid generation and physical field setting were also introduced,the AC loss of a single superconducting strip under the condition of different AC current was analysed.The result shows that the magnetic field intensity is located at both ends of the 2 G HTS,and gradually decreases toward the middle area.With the increase of the amplitude of AC transmission current,the magnetic field intensities of the air inside and around,penetration depth and AC loss increase obviously.Besides,the correctness of the three dimensional simulation settings and the reliability of the results are confirmed by comparing the results of two dimensional simulation and three dimensional simulation.