Analysis And Research Of Leakage Magnetic Field For Toroidal-Type HTS SMES Magnet

With the rapid development of economy in our country, the traditional coal, oil and other fossil fuels as the representative of the energy is gradually replaced by renewable energy. Storage technology as the core technology of renewable energy, plays a leading role for the extensive use of renewable energy. Storage technology could be divided into many types according to its specific form, including flywheel energy storage, pumped storage, superconducting magnetic energy storage, battery energy storage, etc. Superconducting magnetic energy storage system is stored electromagnetic energy under the normal working conditions, can quickly exchange high-power energy with the grid, realize lossless storage, without mechanical rotation application, simple maintenance and little pollution at the same time, compared with other storage methods has obvious advantages.Superconducting energy storage magnet as the key part of the superconducting magnetic energy storage system, can generate the energy density to 108 J/m3 when open great current into magnets under the normal working, the center of the field intensity produced several tesla’s level, the leakage magnetic field produced in the outer space generated by a magnet system when it is working, it can bring adverse effect on the surrounding environment. To make the use of superconducting magnetic energy storage system play a great role, the magnet system as the key part, it is very necessary to reduce the negative influence of leakage magnetic field.This thesis mainly aimed at the study on the leakage magnetic field of toroidal magnet, which is one type of the superconducting magnet. Firstly, the composition and working principle of superconducting magnetic energy storage system were introduced, then, the present situation of the development of superconducting energy storage system and the research status of toroidal high temperature superconducting energy storage magnet were summarized.Secondly, on the basis of the theory foundation of electromagnetic field analysis of the high temperature superconducting energy storage magnet and mathematical model of superconducting solenoid coil magnetic field calculation, combined with the ANSYS electromagnetic finite element simulation analysis software, by using the combined method of analytic and numerical analysis, analysed the leakage magnetic field for six units, eight units, twelve units toroidal magnet and single solenoidal magnet, obtained the cloud distribution and the path diagram of magnetic induction intensity vector and other parameters, compared the results to get the advantages of toroidal magnet.Finally, under the premise of toroidal magnet electromagnetic field analysis, obtained the electromagnetic force cloud distribution, and then on the basis of theory of electromagnetic structure, the stress simulation analysis of ANSYS on the toroidal magnet with a support structure to get the magnet coils structure with displacement deformation. Then turn to make the analysis of leakage magnetic of deformation coil,compared to summarize the change of leakage magnetic field. The simulation results provided a reference basis for the optimization of design, the superconducting magnet structures improvement, had a certain reference value on the taken of shielding measures of the leakage magnetic field produced in the work at the same time.