Improvement of a high current DC power supply system for testing the large scaled superconducting cables and magnets

Author

Yamada, Shuichi ; Chikaraishi, Hirotaka ; Tanahashi, Shugo ; Mito, Toshiyuki ; Takahata, Kazuya ; Yanagi, Nagato ; Sakamoto, Mizuki ; Nishimura, Arata ; Motojima, Osamu ; Yamamoto, Junya ; Yonenaga, Yuji ; Watanabe, Ryouzo

Author_Institution

Nat. Inst. for Fusion Sci., Gifu, Japan

Volume

30

Issue

4

fYear

1994

fDate

7/1/1994 12:00:00 AM

Firstpage

1782

Lastpage

1785

Abstract

A DC 75 kA power supply system was constructed to test the SC (superconducting) R&D (research and development) cables and magnets for the Large Helical Device (LHD). It consists of three 25 kA unit banks. A unit bank has two double-star-rectifier connections with the inter-phase reactors. A digital feedback control method is applied to the automatic current regulation (ACR) in each unit bank. For shortening the dead time of the feedback process, a new algorithm of a digital phase controller for the ACR is investigated. A Bode diagram of the feedback process is directly measured. It is confirmed that the dead time of the feedback process is reduced to one sixth, and that the feedback gain of PID (proportional, integral and differential) compensation is improved by a factor of two from the original method

Keywords

power systems; stellarators; superconducting cables; superconducting magnets; 25 kA; 75 kA; ACR; Bode diagram; LHD; Large Helical Device; PID compensation; automatic current regulation; dead time; digital feedback control method; digital phase controller; double-star-rectifier connections; feedback gain; high current DC power supply system; inter-phase reactors; large scaled superconducting cables; proportional integral differential compensation; superconducting magnets; unit banks; Current control; Current supplies; Digital control; Feedback control; Inductors; Power supplies; Research and development; Superconducting cables; Superconducting magnets; System testing;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.305606

Filename

305606