Dynamic loss analysis for 4.5 MJ SMES

Dynamic or transient loss inside the proposed sector toroidal coil cryostat has been evaluated for the indigenous development of 4.5 MJ/1 MW superconducting magnetic energy storage (SMES) at VEC Centre, Kolkata. The frequent charging/discharging mode of operation in SMES coil results in dynamic loss that needs to be addressed for safe and reliable operation of the coil. The dynamic losses are derived considering local bi-directional magnetic field variation on the conductor for constant voltage output across the SMES coil through DC link. This loss will eventually determine the stability of Rutherford type cable inside the bath cooled cryostat. The result of dynamic loss analysis and subsequent additional cryogen load on plant is presented here.