Energy Storage Characteristics of MJ-Class Toroidal HTS-SMES Considering Maximum Value of Perpendicular Magnetic Field☆

Abstract The Superconducting Magnet Energy Storage (SMES) will be more and more popular in the electric power system in the near future. A toroidal SMES magnet with large capacity is a tendency for SMES because it has great energy density and low stray field. Firstly, a toroidal HTS-SMES magnet model is built to obtain the maximum value of the perpendicular magnetic field by the finite element method (FEM), and then the storage energy is calculated. Secondly, the operating current Iop=1kA and internal radius Ri=150mm keep unchangeable to research the relationship for the storage energy E, the number of double pancake coil (DPC) n wound by 150m YBCO tapes and the distance from the element coil center to the toroidal magnet center R. Finally, a 3 MJ toroidal HTS-SMES magnet is designed using the characteristic analysis results and its distribution of magnetic induction intensity and stray field are discussed in detail.