Design Of High Temperature Superconducting Energy Storage Magnet Based On Multi Fields Coupled

The superconducting magnetic energy storage system(SMES) has the characteristics of short response time and high efficiency. It can improve the stability of the system and the power quality. Superconducting magnet is a key part of SMES. The optimization of the design needs to consider the influence of electromagnetic field, stress field and temperature field. It is one of the key problems in the superconducting power technology. This paper focuses on the study of electromagnetic, force and thermal analysis of high temperature superconducting magnetic energy storage magnet. The electromagnetic and structural design of 10 MJ high temperature superconducting magnetic energy storage magnet is carried out. The main work and achievements are as follows:(1) The electromagnetic characteristics of two types of HTS tapes and stress/strain characteristics are measured to construct a database of magnet interpolation simulation. We set the length of the superconducting tapes as the goal to achieve the 10 MJ HTS magnet design and optimization, and finally propose an initial electromagnetic design scheme.(2) The supporting structure and cooling structure of 10 MJ high temperature superconducting magnet are designed. The equivalent simplified model of SMES is established to calculate the stress and strain distribution of the superconducting coil, the supporting structure, the cold guiding plate and the reinforcement plate.(3) A further optimization is proposed based on structure optimization: The maximum radial stress on the superconducting coil is calculated, either is the maximum equivalent stress on the guide cold plate and reinforcement plate. To optimize the magnet, the initial electromagnetic parameters and structure parameters are adjusted. The optimization results show that the critical current of the superconducting coil and the strength of the support material are both considered in the design, which meet the design goal.(4) An empirical formula calculation method is proposed to achieve the AC loss calculation. AC loss distribution is simulated, either is the magnet cooling process and the thermal stability of the magnet in the power exchange.