100kJ高温超导储能磁体电磁分析及研究

Electromagnetic analysis and research on 100kJ SMES magnet

超导磁储能系统(SMES)是超导在电力领域的一个重要应用。文中介绍的100k J SMES磁体由30个Bi2223/Ag带材绕制的双饼线圈组成,设计工作温度20K,工作电流200A。SMES在运行时,磁体不同位置的带材所受到的磁场的大小和方向不同,其临界电流退化程度也不相同。保证一定的临界电流裕度是磁体稳定工作的前提。文中通过有限元法计算了磁体的磁场分布,分析了磁体的临界电流裕度以及磁体在不同温度下的临界电流。结果表明,磁体在设计工况下电流裕度可达57.5%。计算结果可以为SMES磁体的设计和运行提供参考。

Superconducting magnetic energy storage （SMES） is one of the application of superconductivity in the power grid. The magnet of 100kJ SMES described in this paper consists of 30 double pancakes wound by Bi2223/Ag tapes. When working at design temperature 20K and design current 200A, the coils suffer different magnetic fields at different locations which results in different degradation of critical current of the tapes. Adequate current margin should be assured for the sake of safety and stability of the magnet operation. In this paper, the magnetic fields distribution is obtained using the Finite Element Method and the criti- cal operation current is obtained at different temperature. The results show that the current margin is 57.5% when the magnet works at the design condition. The analysis in this paper provides reference for the design and operation of SMES magnet.