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

Plasma Science and Technology 2023年第5期25卷 193-206页

作者：仝玮徐猛李华陈波宋执权 School of Electrical Engineering and Automation Hefei University of TechnologyHefei 230009People’s Republic of China Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031People’s Republic of China University of Science and Technology of China Hefei 230026People’s Republic of China

Thyristors have longer lifetimes,higher reliability,and very high voltage and current ratings and they require less maintenance than other high-power semiconductor *** a result,they are particularly suitable for quench protection systems(QPSs),which protect the superconducting magnets in large fusion devices from *** 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 *** 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 ***,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 ***,the reliability and stability of the thyristor stack were verified by a series of prototype *** 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

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