SSD operating experience

A self-contained system called the SSD that uses the energy stored in a superconducting magnet to provide voltage support for large electrical loads was developed. Operating experience gained during the development and first two years of SSD field operation is reported. The SSD delivers energy from its superconducting magnet to a customer's load using a current-to-voltage converter which feeds an inverter. Two different systems were developed based on different inverter topologies. One configuration supports an adjustable speed motor load. The other supports diverse AC loads and incorporates a static isolation switch. These systems were installed at customer sites. Each system successfully carried industrial loads through numerous voltage sags. Field operating data on both system configurations are reported. >