A 30 MJ Superconducting Magnetic Energy Storage system will be installed in 1982 in Tacoma, WA, to act as an alternate means of transmission line stabilization. This will be the first use of superconductivity in the electric utility industry. The conductor has been fully tested electrically and mechanically, all major components of the electrical, control, and cryogenic systems have been received, coil assembly is complete, and the epoxy-fiberglass dewar is being purchased.

The 30-MJ superconducting magnetic energy storage for BPA transmission-line stabilizer

The power-system-stabilizing ability of a superconducting magnetic energy storage (SMES) unit consisting of a superconducting coil and an AC/DC power conditioner has been examined experimentally using a model power system and a small SMES unit. A current-fed pulsewidth-modulated power conditioner was used to obtain maximum stabilizing effect by controlling active and reactive power simultaneously and independently. The power conditioner configuration, operating characteristics, and control scheme for power system stabilization are described. Experimental results showing the effectiveness of the approach are reported. >

Power system stabilization by SMES using current-fed PWM power conditioner

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Sistema de Armazenamento de Energia em Bobinas Supercondutoras

Characteristics of Internally Induced Voltage in a Superconducting Magnet under Energy Transfer Conditions

A small-scale Superconducting Magnetic Energy Storage(SMES) unit was constructed using small magnets and a high-voltage converter, and the characteristics of this unit were examined. The high output voltage of the converter makes it possible for even a small magnet to charge and discharge large power. Moreover, converter control provides adequate protection during quenching. AC and DC filters can be eliminated from the converter system, and ripple voltage does not harm the superconducting magnet. These features demonstrated the potential of an SMES unit as a power system stabilizer and a peak load power supply.

H. Kaminosono

Papers

Characteristics of superconducting magnetic energy storage (SMES) energized by a high-voltage SCR converter