Title :
A 0.3 MJ SMES magnet of a voltage sag compensation system
Author :
Jiang, Xiaohua ; Liu, Xun ; Zhu, Xiaoguang ; He, Yeye ; Cheng, Zhiguang ; Ren, Xiaopeng ; Chen, Zhenmin ; Gou, Luhai ; Huang, Xianrui
Author_Institution :
Dept. of Electr. Eng., Tsinghua Univ., Beijing, China
fDate :
6/1/2004 12:00:00 AM
Abstract :
To protect an 110 kVA critical load from voltage sags, a SMES-based voltage sag compensator is developed. This system consists of a 0.3 MJ NbTi magnet and a 150 kVA IGBT-based current source converter. The magnet has a solenoidal coil with an inductance of 1.85 H. Its helium-vapor cooled HTS current leads are further cooled by liquid nitrogen. A protection system is designed for quenches which would most likely happen during the period of charging or discharging of the magnet when a voltage sag occurs or the voltage supply recovers from a sag. The topology of the main circuit of the compensator is also presented and analyzed.
Keywords :
compensation; high-temperature superconductors; niobium compounds; power supply quality; power system protection; power system stability; solenoids; superconducting coils; superconducting magnet energy storage; superconducting magnets; 0.3 MJ; 110 kVA; 150 kVA; HTS current lead; IGBT-based current source converter; NbTi; NbTi magnet; SMES magnet; compensator circuit; critical load; helium-vapor cooled HTS current leads; liquid nitrogen cooling; magnet charging; magnet discharging; quench protection system; solenoidal coil; voltage sag compensation system; voltage supply recovery; Coils; Inductance; Insulated gate bipolar transistors; Niobium compounds; Power quality; Protection; Samarium; Superconducting magnetic energy storage; Titanium compounds; Voltage fluctuations; HTS current lead; SMES; quench protection; voltage sag compensation;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2004.830083
