Title :
2 MJ SMES for an uninterruptible power supply
Author :
Salbert, H. ; Krischel, D. ; Hobl, A. ; Schillo, M. ; Blacha, N. ; Tromm, A. ; Roesgen, W.
Author_Institution :
ACCEL Instruments GmbH, Germany
fDate :
3/1/2000 12:00:00 AM
Abstract :
A low temperature 2 MJ SMES is being built for an uninterruptible power supply. The superconducting magnet is designed for a carry over time of 8 s at a mean power of 200 kW. The maximum power of the SMES is 800 kW at an operating current of 1 kA. The magnet is being built as a liquid helium bath cooled solenoid. The cryogenic system is designed for no boil-off operation and cryocoolers are used for recondensation of the evaporated helium. Low cryogenic losses are achieved by the use of HTS-current leads, AC losses of the magnet are reduced by using a mixed matrix Cu/CuNi/NbTi superconductor. The SMES is connected to the power electronic of the UPS by a chopper circuit and a DC link capacitor. This paper describes the system design and focuses on the superconducting magnet.
Keywords :
choppers (circuits); cryogenics; solenoids; superconducting magnet energy storage; superconducting magnets; uninterruptible power supplies; 1 kA; 2 MJ; 200 kW; 8 s; 800 kW; AC losses; Cu-CuNi-NbTi; DC link capacitor; HTS-current leads; SMES; chopper circuit; cryocoolers; cryogenic system; evaporated helium recondensation; liquid helium bath cooled solenoid; low cryogenic losses; mixed matrix Cu/CuNi/NbTi superconductor; no boil-off operation; superconducting magnet; uninterruptible power supply; Cryogenics; Magnetic losses; Niobium compounds; Samarium; Solenoids; Superconducting magnetic energy storage; Superconducting magnets; Temperature; Uninterruptible power systems;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
