NI-HTS线圈不同波形电流自场交流损耗的计算  

AC loss calculation in self-field of NI-HTS coil carrying different transport currents

作　　者：赵明菲 崔英敏[1,2] 李琦 ZHAO Mingfei;CUI Yingmin;LI Qi(School of Mathematical and Physical Science,North China Electric Power University,Baoding,Hebei 071003,China;Hebei Key Laboratory of Physics and Energy Technology,Baoding,Hebei 071003,China)

机构地区：[1]华北电力大学数理学院,河北保定071003 [2]河北省物理学与能源技术重点实验室,河北保定071003

出　　处：《河北科技大学学报》2024年第5期471-478,共8页Journal of Hebei University of Science and Technology

基　　金：国家自然科学基金(51977078);河北省高等教育改革研究与实践项目(2021GJJG416,2019GJJG414,2023GJJG427)。

摘　　要：针对无绝缘高温超导线圈在交流传输和减小屏蔽电流采用的电流扫描反转等各种传输波形引起的自场交流损耗问题,基于E-J幂指数模型,提出采用磁矢势A和电流矢势T的T-A方法中的均质化模型方法,模拟计算传输电流、频率和n值对无绝缘高温超导饼式线圈的电流密度分布和传输交流损耗的影响。定量计算了双饼线圈中方波、锯齿波和正弦波的瞬时交流损耗;采用等效电路模型模拟分析了充/放电速率对无绝缘高温超导线圈匝间电流分布的影响。结果表明:在几百至几千赫兹时,无绝缘线圈的交流损耗随频率的增加而增加;受线圈匝间电流径向流动的影响,无绝缘线圈快速充电初期可出现局部环向电流反向,急速放电初期产生局部环向电流增加的情况。所得结果可以为无绝缘高温超导线圈的稳定性和交流损耗研究提供一定的理论参考。To solve the problems of the AC loss in self-field for no-insulation(NI)HTS coils carrying different currents,such as AC transport current,the current scanning inverse in order to decrease the screening current,and so on,by using the T-A homogenization model based on the E-J power law,the effects of the transport current,frequency,and the n-value on the magnetic flux density and AC loss of NI-HTS pancack coils were simulated.The instantaneous AC losses of square wave,sawtooth wave,and sinusoidal wave for double-pancake coil were simulated quantitatively.The effects of charging and discharging ramping rates on the current distribution were also discussed by using partial element equivalent circuit(PEEC).The results show that the AC losses increase with the increase of frequency from several hundred to kilo Hz.Due to the transfer of the radial current within coil’s turns,some inverse azimuthal currents may appear in the NI-HTS coil in the early charging period,and some of the azimuthal currents may increase during short discharging period for the same reason.The simulation work can provide some theoretical references for the studies of the stability and AC loss for NI-HTS pancake coils.

关 键 词：超导物理学 高温超导磁体 无绝缘线圈 REBCO 交流损耗 

分 类 号：O511.9[理学—低温物理]