Author/Authors :
Yamada، نويسنده , , Shuichi and Mito، نويسنده , , T. and Chikaraishi، نويسنده , , H. and Nishimura، نويسنده , , A. and Kojima، نويسنده , , H. and Nakanishi، نويسنده , , Y. and Uede، نويسنده , , T. and Satow، نويسنده , , T. and Motojima، نويسنده , , O.، نويسنده ,
Abstract :
The LHD is an SC experimental fusion device of heliotron type. Eight sets of the helium compressors with total electric power of 3.5 MW are installed in the cryogenic system. The analytical studies of the SMES-UPS for the compressors under the deep voltage sag are reported in this paper. The amplitude and frequency of the voltage decrease gradually by the regenerating effect of the induction motors. The SMES-UPS system proposed in this report has the following functions; (1) variable frequency control, (2) regulations by ACR and AVR, and (3) rapid isolation and synchronous reconnection from the loads to grid line. We have demonstrated that SMES was useful for the large-scaled cryogenic system of the experimental fusion device.
Keywords :
SMEs , Induction motor , voltage sag , Cryogenic system , LHD , UPS
