Specifications and performance experiences of internally cooled small-scale SMES

Hamajima, T.; Kitamura, K.; Shimizu, Masaki; Satow, T.

doi:10.1016/s0011-2275(98)00101-5

Cited by 3 publications

(1 citation statement)

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“…Superconducting magnetic energy storage (SMES) is a remarkable application of superconducting magnets [1][2][3][4]. The potential utilization of high-temperature superconducting materials is especially promising in order to obtain devices showing high efficiency and lifetime for uninterruptible power supplies (UPS) [5,6].…”

Section: Introductionmentioning

confidence: 99%

Use of a High-Temperature Superconducting Coil for Magnetic Energy Storage

Fagnard¹,

Crate²,

Jamoye³

et al. 2006

J. Phys.: Conf. Ser.

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Abstract. A high temperature superconducting magnetic energy storage device (SMES) has been realised using a 350 m-long BSCCO tape wound as a "pancake" coil. The coil is mounted on a cryocooler allowing temperatures down to 17.2 K to be achieved. The temperature dependence of coil electrical resistance R(T) shows a superconducting transition at T = 102.5 K. Measurements of the V(I) characteristics were performed at several temperatures between 17.2 K and 101.5 K to obtain the temperature dependence of the critical current (using a 1 µV/cm criterion). Critical currents were found to exceed 100 A for T < 30 K. An electronic DC-DC converter was built in order to control the energy flow in and out of the superconducting coil. The converter consists of a MOS transistor bridge switching at a 80 kHz frequency and controlled with standard Pulse Width Modulation (PWM) techniques. The system was tested using a 30 V squared wave power supply as bridge input voltage. The coil current, the bridge input and output voltages were recorded simultaneously. Using a 10 A setpoint current in the superconducting coil, the whole system (coil + DC-DC converter) can provide a stable output voltage showing uninterruptible power supply (UPS) capabilities over 1 s.

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