Protection from internal faults in a special high power switching conversion system for thermonuclear fusion application

L. Zanotto, M. Dan, E. Gaio, D. Gutierrez, H. Decamps, M. Perna, Daniele Falchi, C. Finotti, C. Panizza, A. Premoli
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引用次数: 1

Abstract

This paper compares different provisions to protect a special high power switching power supply from internal short-faults, in particular internal short-circuits. The power supply is based on a five three-phase NPC inverters, with common dc-link, rated for a total power of about 60MW and for an output voltage of 6.5kV, using IGCTs as switching components. A large, distributed, capacitor bank is connected at the dc-link side of the inverters, with huge amount of stored energy, as high as 760kJ during nominal operation. In case of internal short-circuit of one inverter leg, due for example to a failure of one IGCT, this energy is discharged into the faulty leg, potentially leading to explosion and fault propagation. Simulations have been performed in order to analyze, select and design the most suitable protection to avoid this risk.
热核聚变专用大功率开关转换系统的内部故障保护
本文比较了一种特殊大功率开关电源的内部短路保护措施,特别是内部短路保护措施。该电源基于5个三相NPC逆变器,采用普通直流链路,额定总功率约60MW,输出电压为6.5kV,使用igct作为开关元件。在逆变器的直流侧连接了一个大型的分布式电容器组,存储了大量的能量,在标称运行期间高达760kJ。在一个逆变器分支内部短路的情况下,例如由于一个IGCT的故障,这种能量被释放到故障分支中,可能导致爆炸和故障传播。为了分析、选择和设计最合适的保护措施来避免这种风险,进行了仿真。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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