Structural Optimization Design of Rotor Magnet of Large High Temperature Superconducting Condenser

AbstractHigh temperature superconducting (HTS) condenser has the advantages of small volume, light weight, and high efficiency, and is widely used to adjust the reactive power balance in the power grid. To meet the requirements of the air gap magnetic field, the rotor in a large Rotor-Type HTS condenser usually needs to be stacked with multiple Racetrack-Type magnets. To reduce the influence of magnetic field on magnets operation and improve the critical current of magnets, four stacked methods of racetrack magnets with different structures are proposed and simulated through finite element software. Through the comparison of simulation results, the optimal stacked structure is obtained, and the structural parameters are optimized. The results show that the maximum vertical component of the magnetic field generated by the magnets in structure (c) is the smallest, which has a greater critical current and safety margin of the magnets and can also increase the air gap magnetic field above the magnets. KeywordsHigh temperature superconducting condenserRotor magnetStructural optimizationElectromagnetic analysis