Thermal Characteristics of REBCO Coil in a Wireless Power Transmission System for the Railway Vehicle in Liquid Nitrogen
Thermal Characteristics of REBCO Coil in a Wireless Power Transmission System for the Railway Vehicle in Liquid Nitrogen
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DOI：
10.1109/tasc.2021.3059234
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发表时间：
2021-08
影响因子：
1.8
通讯作者：
Ryota Inoue;H. Ueda;S. Kim;M. Tsuda
中科院分区：
文献类型：
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作者：
Ryota Inoue;H. Ueda;S. Kim;M. Tsuda
铁路车辆使用高温超导（HTS）线圈的无线电力传输（WPT）系统需要在短时间内（60秒）传输数百千瓦的电力。为了设计使用具有热稳定性的HTS线圈的WPT系统，有必要明确HTS线圈在kHz频段工作电流下的热特性以及WPT系统中考虑热稳定性的工作条件。我们分析了高温超导线圈在1 kHz以上的临界电流的频率特性，并研究了在液氮中使用高温超导线圈的铁路车辆WPT系统中考虑热稳定性的运行条件。结果，HTS线圈在kHz频段的临界电流随着频率的增加而减小。这是因为高温超导线圈中的交流损耗随着频率的增加而增加，而高温超导线圈的临界电流密度随着表面温度的升高而降低。为了设计在kHz频带内具有热稳定性的HTS线圈，需要在小于直流电测量的临界电流的约50%的交流电下操作HTS线圈。我们发现，能够通过约2kHz频率的工作电流来实现能够快速充电60秒的热稳定WPT系统。
A wireless power transmission (WPT) system using the high temperature superconducting (HTS) coil for a railway vehicle is required to transmit the electric power of several hundred kW in a short time (60 s). In order to design the WPT system using HTS coil with the thermal stability, and it is necessary to clarify the thermal characteristics of the HTS coil at the operating current in kHz band and the operating conditions considering thermal stability in the WPT system. We analyzed the frequency characteristics of the critical current in the HTS coil above 1 kHz and investigated the operating conditions considering thermal stability in the WPT system for the railway vehicle using HTS coil in liquid nitrogen. As a result, the critical current of the HTS coil in the kHz band decreased with the frequency. This is because the AC loss in the HTS coil increased with the frequency, and the critical current density of the HTS coil decreased with increasing the surface temperature. In order to design the HTS coil with thermal stability in the kHz band, and it is necessary to operate the HTS coil on alternating current less than about 50% of the critical current measured by direct current. We found that the thermally stable WPT system capable of fast charging for 60 seconds can be realized by operating current at the frequency of about 2 kHz.