Research On Mechanical Stability Of 10MJ Superconducting Energy Storage Magnet

Compared with traditional energy storage,superconducting magnetic energy storage has many advantages such as small footprint,fast energy charging and discharging,high power density,and extremely fast response speed,and has broad application prospects.Composite conductors based on the second-generation hightemperature superconducting coating conductors have stronger current carrying capacity,which can meet the needs of rapid charging and discharging.Magnets generate significant Lorentz forces during operation,so when designing magnets,it is necessary to comprehensively consider electromagnetic and mechanical characteristics to ensure the safe operation of the magnets.This article optimizes a high current and low inductance energy storage magnet based on composite conductor design,analyzes its mechanical stability,and proposes and verifies protective measures.The performance of magnets designed with different composite conductors was compared.Propose simplification of the optimization scheme for magnet design.Based on quasi isotropic conductor(QIS)and direct stacked conductor(STC),the design optimization of the magnet was carried out with the goal of minimizing the consumption of strip material.The advantages and disadvantages of different structural parameters of the magnet were compared and analyzed,and the specific parameters of the magnet were determined.In order to verify the mechanical stability of the magnet,the stress distribution of the magnet based on quasi isotropic conductors with different support structures under operating current was calculated.Analyzed and compared the stress distribution of magnets under different material and thickness support structures.The hazardous areas where magnets are prone to force damage have been identified,and specific measures for using support protection have been proposed.The force acting on the magnet during operation was studied.The stress-strain distribution of the magnet during charging and discharging processes was simulated and calculated using a finite element model.The stress distribution in the hazardous area of the magnet was mainly analyzed,and the reliability of protective measures was verified.Analyzed the factors that affect the shielding current and compared the mechanical stability of two types of magnets.It has been proven that QIS conductors are more suitable for magnet design than STC conductors.