Replacing expensive IGBT with thyristor to design dc circuit breaker (dcCB) is attracting attention recently due to its advantages in terms of low investment and low conduction loss. However, due to the half-controlled characteristic of thyristor, the existing thyristor-based dcCBs (T-CBs) cannot be actively turned off. As a result, the opening process is not fully controllable and reliable. In this letter, a simple active T-CB (AT-CB) topology is proposed. The proposed AT-CB can interrupt both fault current and operation current actively, and the current breaking process is fast, reliable, and fully controllable. Moreover, the proposed AT-CB can be improved to be bidirectional without increasing the conduction loss, and the topology remains simple. Parameters design principle and operation process of AT-CB are presented. Scaled-down experiment verified the effectiveness of the proposed solution.

中文翻译：

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一种具有可靠分闸过程的新型有源晶闸管直流断路器


用晶闸管代替昂贵的IGBT来设计直流断路器(dcCB)因其投资少、导通损耗低等优点而备受关注。然而，由于晶闸管的半控特性，现有的基于晶闸管的直流断路器（T-CB）无法主动关断。因此，开启过程并不完全可控且可靠。在这封信中，提出了一种简单的有源 T-CB (AT-CB) 拓扑。所提出的AT-CB能够主动分断故障电流和操作电流，并且电流分断过程快速、可靠且完全可控。此外，所提出的AT-CB可以在不增加传导损耗的情况下改进为双向，并且拓扑保持简单。介绍了AT-CB的参数设计原理和运行流程。缩小实验验证了所提出解决方案的有效性。