Title :
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
fDate :
7/1/1994 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
