100 kA/10kV thyristor stack design for the quench protection system in CRAFT  

作　　者：仝玮 徐猛 李华 陈波 宋执权 Wei TONG;Meng XU;Hua LI;Bo CHEN;Zhiquan SONG(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,People’s Republic of China;Institute of Plasma Physics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,People’s Republic of China;University of Science and Technology of China,Hefei 230026,People’s Republic of China)

机构地区：[1]School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,People’s Republic of China [2]Institute of Plasma Physics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,People’s Republic of China [3]University of Science and Technology of China,Hefei 230026,People’s Republic of China

出　　处：《Plasma Science and Technology》2023年第5期193-206,共14页等离子体科学和技术（英文版）

基　　金：supported by National Key Research and Development Program of China(Nos.2017YFE0300504 and 2017YFE0300500);the Comprehensive Research Facility for the Fusion Technology Program of China(No.2018000052-73-01-001228)。

摘　　要：Thyristors have longer lifetimes,higher reliability,and very high voltage and current ratings and they require less maintenance than other high-power semiconductor devices.As a result,they are particularly suitable for quench protection systems(QPSs),which protect the superconducting magnets in large fusion devices from damage.In this paper,we propose a design for a 100 k A/10 k V thyristor stack supported by both theoretical and simulation-based analyses as well as experimental verification.Due to the ultrahigh electrical performance requirements imposed on the QPS by the Comprehensive Research Facility for Fusion Technology(CRAFT),three main issues must be considered:the voltage-balancing problem caused by multiple thyristors in a series structure,the increased junction temperature problem caused by extremely high currents,and the reverse recovery phenomenon that arises from the thyristor’s physical structure.Hence,a series of detailed theoretical analyses,simulations,and experiments,including a thyristor junction temperature prediction method and reverse recovery process modeling,were carried out to optimize the design.Finally,the reliability and stability of the thyristor stack were verified by a series of prototype experiments.The results confirmed the correctness and accuracy of the proposed thyristor stack design method and also indicated that the proposed thyristor stack can meet the application conditions of a 100 k A QPS in the CRAFT project.

关 键 词：superconducting magnet THYRISTOR pulsed power supply quench protection system 

分 类 号：TL631.24[核科学技术—核技术及应用]