Browse > Article
http://dx.doi.org/10.6113/TKPE.2014.19.5.399

Comparative Analysis of Sequence Control in Six Series-Connected ITER VS Converters  

Jo, Hyunsik (Dept. of Electrical Eng., Chungnam National University)
Jeong, Jinyong (Dept. of Electrical Eng., Chungnam National University)
Jo, Jongmin (Dept. of Electrical Eng., Chungnam National University)
Cha, Hanju (Dept. of Electrical Eng., Chungnam National University)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.19, no.5, 2014 , pp. 399-406 More about this Journal
Abstract
This study investigates the structure and operation of the ITER VS converter and proposes a sequence control method for six series-connected VS converters to reduce reactive power. The operation and the proposed sequence control method are verified through RTDS simulation. The ITER VS converter must supply voltage/current to the superconducting magnets for plasma current vertical stabilization, and the four-quadrant operation must proceed without a zero-current discontinuous section. The operation mode of the VS converter is separated into a 12- and 6-pulse circulating current and transition modes according to the size of the load current. The output voltage of the unit VS converter is limited because of the rated voltage; however, the superconducting coil must increase the operating output voltage. Thus, the VS converter must be connected in a 6-series to provide the required operating output voltage. The output voltage of the VS converters is controlled continuously; however, reactive power is limited within a minimized value of the grid. In this study, the unit converter is compared with converters connected in a 6-series to determine a suitable sequence control method. The output voltage is the same in all cases, but the maximum reactive power is reduced from 100% to 73%. This sequence control method is verified through RTDS simulation.
Keywords
ITER VS converter; Sequence control; 12-pulse phase controlled rectifier; RTDS;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 C. Lee, H. Liu, K. Hwang, S. Lee, H. Park, C. Kim, J.S. Oh, J.H. Suh, J. Choi, "A novel control for four-quadrant operation of ITER VS converter," Electrical Machines and Systems(ICEMS), 2013 International Confrence, pp. 1657-1661, 2013.
2 S. Mukhopadhyay, "A new concept for improving the performance of phase-controlled converters," IEEE Transactions on Industry Applications, Vol. 1A-14, No. 6, pp. 594-603, Nov./Dec. 1978.
3 E. P. Wiechmann, R. P. Burgos, J. Holtz, "Sequential connection and phase control of a high-current rectifier optimized for copper electrowinning applications," IEEE Transactions on Industrial Electronics, Vol. 47, No. 4, pp. 734-743, 2000.
4 H. S. Heo, K. W. Park, I. C. Jeong, H. S. Shin, J. A Park, Y. W. Lee, J. W. Choi, J. S. Oh, J. H. Suh, "Sequence control of small-scaled ITER power supply for reactive power compensation," Industrial Technology(ICIT), 2010 International Conference, pp. 813-817, 2010.
5 J. W. Choi, "ITER Superconducting Magnet Power Supply System," KIPE Magazine, Vol. 17, No. 4, pp. 33-38, Aug. 2012.
6 C. Neumeyer, I. Benfatto, J. Hourtoule, J. Tao, A. Mankani, F. Milani, S. Nair, I. Suh, H. Tan, M. Wang, J.S. Oh, A. Roshal, "ITER Power supply innovations and advances," Fusion Engineering(SOFE), 2013 IEEE 25th Symposium, pp. 1-8, 2013.
7 J. Goff, I. Benfatto, J. Tao, I. Yonekawa, K. C. Hwang, J.B. Kang, H.G. Kim, J.S. Oh, E. Seo, J.H. Suh, "Control and instrumentation of the ITER coil power supply system," Control and Automation 2013, Uniting Problems and Solutions, IET Conference, pp. 1-6, 2013.
8 E. Gaio, R. Piovan, V. Toigo, I. Benfatto, "The control system of the ITER vertical stabilization converter," 22nd Symposium on Fusion Technoloy, pp. 719-725, Sep. 2003.
9 G. B. Chung, J. K Ji, H. S. Mok, "Output control of ITER vertical stabilization converter with circulating current technique," Trans. KIPE, Vol. 14, No. 5, pp. 379-386, Oct. 2009.   과학기술학회마을
10 J. H. Suh, J. S. Oh, J. Choi, E. H. Song, G. S. Lee, K. S. Eom, J. Goff, J. Tao, P. Fu, "Korean R&D on the converter controller for ITER AC/DC converters," Fusion Engineering(SOFE), 2011 IEEE/NPSS 24th Symposium, pp. 1-5, 2011.