The current limiting function enables the solid-state circuit breaker (SSCB) to have proper protection coordination. It allows sustained overcurrent for a certain period while preventing the fast fault current increase in dc systems. For the conventional method of using switches alone to limit the current, the high loss results in a short withstand time and low current limiting capability of the SSCBs. In this letter, a control strategy is proposed to utilize the energy absorption component to handle the major part of the energy during the current limiting stage to increase the current limiting capability for series-connected SSCB switching cells. The proposed method is experimentally verified to have more than 3X current limiting withstand time compared to the conventional control strategy in a case study.

中文翻译：

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具有串联开关单元的基于 WBG 的固态断路器的限流策略


限流功能使固态断路器（SSCB）具有适当的保护配合。它允许在一定时间内持续过流，同时防止直流系统中故障电流快速增加。传统的单独使用开关限流的方法，损耗较高，导致SSCB的耐受时间短、限流能力低。在这封信中，提出了一种控制策略，利用能量吸收组件来处理限流阶段的大部分能量，以提高串联SSCB开关单元的限流能力。在案例研究中，经实验验证，所提出的方法与传统控制策略相比具有超过 3 倍的限流耐受时间。