Development of UPS-SMES as a protection from momentary voltage drop

Toshiyuki Mito, Akifumi Kawagoe, Hirotaka Chikaraishi, Kagao Okumura, Ryo Abe, Tomosumi Baba, Kenji Yamauchi, Mitsuhiro Yokota, Tsutornu Henmi, Kazutaka Seo, Kazuo Hayashi, Masataka Iwakuma, Fumio Sumiyoshi

Research output: Contribution to journalArticlepeer-review


We have been developing the UPS-SMES as a protection from momentary voltage drop and power failure. The superconducting system is suitable as electric power storage for large energy extraction in a short time. The most important feature of superconducting coil system for the UPS-SMES is easy handling and maintenance-free operation. We have selected Low Temperature Superconducting (LTS) coils instead of High Temperature Superconducting (HTS) coils from the viewpoint of cost and performance. However, it is difficult for the conventional LTS coils to fulfill maintenance-free operation since the cooling methods are either pool boiling with liquid helium or forced flow of supercritical helium. Thus, a conduction cooled LTS pulse coil has been designed as a key component of the UPS-SMES. The development program of 1 MW, l sec UPS-SMES is explained.

Original languageEnglish
Pages (from-to)721-726
Number of pages6
JournalIEEE Transactions on Applied Superconductivity
Issue number2
Publication statusPublished - Jun 2004

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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