Design and experimental verification of an ultrafast medium-voltage DC solid-state circuit breaker using cascaded normally-on SiC JFETs

被引：0
|
作者：
He, Dong [1 ]
Xu, Xingdong [1 ]
Lan, Zheng [1 ]
Wang, Wei [2 ]
机构：
[1] College of Electrical and Information Engineering, Hunan University of Technology, Zhuzhou,412007, China
[2] College of Electrical and Information Engineering, Hunan University, Changsha,410082, China
来源：
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | 2024年 / 52卷 / 05期
关键词：
The solid-state circuit breaker (SSCB) is a crucial component in the protection of DC distribution networks in that they facilitate reliable; arc-free; and fast isolation of DC faults. First; a novel medium-voltage DC SSCB topology based on cascaded silicon carbide (SiC) junction field effect transistors (JFETs) is proposed. When a DC fault occurs; metal oxide varistors (MOVs) are used to provide driving voltage to the gate-source terminals of cascaded normally-on SiC JFETs of the SSCB main switch. These can achieve fast DC fault protection. Additionally; the operational characteristics of the SSCB turn-off and turn-on processes are analyzed in detail; and the design method of key parameters of the SSCB drive circuit is proposed. Finally; a 1.5 kV/63 A medium-voltage SSCB prototype based on three cascaded normally-on SiC JFETs is developed; and the effectiveness of the design scheme is verified through short-circuit fault and fault recovery experiments. The results indicate that the response time for the SSCB to turn off the 250A short-circuit current is about 20 μs. Fault recovery conduction response time is about 12 μs. This provides a foundation for the topology optimization design of medium-voltage DC SSCB and the improvement of dynamic and static voltage balance performance of cascaded normally-on SiC JFETs. © 2024 Power System Protection and Control Press. All rights reserved;
D O I：
10.19783/j.cnki.pspc.231277
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页码：158 / 167
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