Concept design of 100 kA hybrid DC breaker on China fusion engineering test reactor

Abstract China Fusion Engineering Test Reactor (CFETR) is the next device for the Chinese magnetic confinement fusion program, which is now under conceptual design phase. This paper describes the concept design of the high current hybrid breaker for the quench protection of superconducting magnets. The rated currents and maximum reapplied interruption voltages for breaker are 100 kA and 20 kV. The concept solution design of DC breaker is presented, which is mainly composed of a mechanical main switch with three levels contacts for conducting the continuous current, and a solid-state switch in parallel for current transferring. The design principles of each part and the preliminary results are given respectively. Finally, two test platforms were built to verify the calculation and design. Compared with the traditional oscillation zero-point DC breaker, the hybrid breaker topology can improve the dielectric strength recovery speed of mechanical switch and reduce the whole operation time. It is more suitable for fast current interruption at heavy DC current level.

[1]  Gye-Yong Jang,et al.  OVERVIEW OF SUPERCONDUCTING MAGNET POWER SUPPLY SYSTEM FOR THE KSTAR 1 ST PLASMA EXPERIMENT , 2008 .

[2]  Abderrezak Rezzoug,et al.  3D-computation of a thermal process in a superconducting coil , 1995 .

[3]  Jiawu Zhu,et al.  Electromagnetic, mechanical and thermal performance analysis of the CFETR magnet system , 2015 .

[4]  Peng Fu,et al.  Structure Optimization of Fast Discharge Resistor System for Quench Protection System , 2019, IEEE Access.

[5]  Alexander Roshal,et al.  Type tests of switches for the ITER coil power supply system , 2017 .

[6]  Liao Yan-chuan.  Analysis of Discharge Based on Toroidal Field Coils of EAST , 2009 .

[7]  E. Gaio,et al.  Final design of the Quench Protection Circuits for the JT-60SA superconducting magnets , 2012, 2011 IEEE/NPSS 24th Symposium on Fusion Engineering.

[8]  P. Libeyre,et al.  The ITER Magnets: Design and Construction Status , 2012, IEEE Transactions on Applied Superconductivity.

[9]  R. Piovan,et al.  Vacuum Breaker for High DC Current: Experimental Performances and Operational Limits , 2009, IEEE Transactions on Plasma Science.

[10]  E. Salpietro,et al.  The European development of a full scale switching unit for the ITER switching and discharging networks , 2005 .

[11]  Y. M. Eyssa,et al.  Modeling of electromagnetic and thermal diffusion in a large pure aluminum stabilized superconductor under quench , 2001 .

[12]  He Zhiyuan,et al.  Control strategy of the full-bridge based hybrid DC breaker , 2015, 2015 IEEE First International Conference on DC Microgrids (ICDCM).

[13]  Anshuman Shukla,et al.  A Survey on Hybrid Circuit-Breaker Topologies , 2015, IEEE Transactions on Power Delivery.

[14]  Jun Liang,et al.  Interlink Hybrid DC Circuit Breaker , 2018, IEEE Transactions on Industrial Electronics.

[15]  P. Barabaschi,et al.  Overview of engineering design, manufacturing and assembly of JT-60SA machine ☆ , 2014 .

[16]  Zhiquan Song,et al.  Quench protection of the poloidal field superconducting coil system for the EAST tokamak , 2006 .

[17]  J. Hourtoule,et al.  ITER power supply innovations and advances , 2013, 2013 IEEE 25th Symposium on Fusion Engineering (SOFE).

[18]  Peng Fu,et al.  Concept Design of CFETR Tokamak Machine , 2014, IEEE Transactions on Plasma Science.

[19]  Zhiquan Song,et al.  Conceptual Design of Switch Network Unit for CFETR Coil Power Supply Systems , 2019, IEEE Access.

[20]  Wenge Chen,et al.  The design and the manufacturing process of the superconducting toroidal field magnet system for EAST device , 2008 .

[21]  Jun Tao,et al.  Current sharing design of ITER poloidal field converter bridges , 2018, Fusion Engineering and Design.

[22]  Steffen Bernet,et al.  Comparison of 4.5-kV Press-Pack IGBTs and IGCTs for Medium-Voltage Converters , 2013, IEEE Transactions on Industrial Electronics.

[23]  J.-M. Meyer,et al.  A DC hybrid circuit breaker with ultra-fast contact opening and integrated gate-commutated thyristors (IGCTs) , 2006, IEEE Transactions on Power Delivery.

[24]  Ivone Benfatto,et al.  The fast discharge system of ITER superconducting magnets , 2011, 2011 International Conference on Electrical Machines and Systems.

[25]  B. Wan,et al.  Physics Design of CFETR: Determination of the Device Engineering Parameters , 2014, IEEE Transactions on Plasma Science.

[26]  J. H. Schultz,et al.  The KSTAR superconducting magnet system , 1997, 17th IEEE/NPSS Symposium Fusion Engineering (Cat. No.97CH36131).

[27]  Guo Bin,et al.  Current Sharing Analysis of Arm Prototype for ITER PF Converter Bridge , 2014 .

[28]  Inho Song,et al.  Quench Protection System for KSTAR Superconducting Coil , 2007, 2007 IEEE International Symposium on Industrial Electronics.

[29]  Luca Novello,et al.  Full scale prototype of the JT-60SA Quench Protection Circuits , 2013 .

[30]  Arman Hassanpoor,et al.  Technical assessment of load commutation switch in hybrid HVDC breaker , 2015, 2014 International Power Electronics Conference (IPEC-Hiroshima 2014 - ECCE ASIA).

[31]  Tullio Bonicelli,et al.  The development and testing of a 66 kA by-pass switch with arc commutation capability for the ITER coil power supply system , 1997, 17th IEEE/NPSS Symposium Fusion Engineering (Cat. No.97CH36131).

[32]  Rong Zeng,et al.  Analysis and Experiments for IGBT, IEGT, and IGCT in Hybrid DC Circuit Breaker , 2018, IEEE Transactions on Industrial Electronics.