SSD OPERATING EXPERIENCE

Superconductivity, Inc. has developed a self-contained system called the SSDTm that uses the energy stored in a superconducting magnet to provide voltage support for large electrical loads. This paper reports on operating experience gained during the development and first two years of SSD field operation. 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 have been 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. After commissioning on SI's test floor these systems have been installed at customer sites. Each system has successfully carried industrial loads through numerous voltage sags. Field operating data on both system configurations is reported. A companion paper by Buckles et. al. [1] contains a detailed discussion of the design of the SSD.