The emergence of power electronics has lead to a paradigm shift toward dc grids, which are widely recognized to provide better performance and efficiency. However, fault isolation is one of the prime challenges of dc grids due to the absence of current zero-crossing. With this motivation, this article introduces a novel silicon-controlled-rectifier-based bidirectional dc solid-state circuit breaker. In addition to its ability to isolate the faulty section, the proposed topology can also provide soft reclosing capability, which aids in reducing repetitive voltage and current stress on the breaker and current feeding components. Moreover, the heat loss by the surge suppression devices during reclosing is negligible. Equations are derived to analyze the effect of component values on various circuit-level considerations. Simulation and scaled-down experimental results are presented to verify the operation of the breaker under various operating conditions.

中文翻译：

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用于直流系统保护的基于 SCR 的双向断路器，具有软重合闸功能


电力电子技术的出现导致了向直流电网的范式转变，人们普遍认为直流电网可以提供更好的性能和效率。然而，由于不存在电流过零，故障隔离是直流电网的主要挑战之一。以此为动机，本文介绍了一种新型可控硅双向直流固态断路器。除了能够隔离故障部分之外，所提出的拓扑还可以提供软重合闸功能，这有助于减少断路器和电流馈送组件上的重复电压和电流应力。此外，重合期间浪涌抑制装置的热损失可以忽略不计。推导出方程来分析元件值对各种电路级考虑因素的影响。仿真和按比例缩小的实验结果验证了断路器在各种运行条件下的运行情况。