With the rapid development of DC transmission technology, DC circuit breakers, the key equipment for DC fault handling, have become a research hotspot of scholars. This paper proposes a novel hybrid DC circuit breaker topology to improve the shortcomings of traditional hybrid DC circuit breakers. Traditional hybrid DC circuit breakers use too many IGBTs, which results in a large volume and a high cost. The main innovation of this topology is the use of a mechanical switch in series in a solid-state branch, which withstands most of the voltage. An oscillating circuit is in parallel on the mechanical switch, which can generate reverse current to reduce the current flowing through the mechanical switch to zero, to achieve arc free breaking. The feasibility of the proposed topology is verified based on a PSCAD simulation platform. It should serve as a valuable reference for the design of DC distribution systems and DC breakers.

中文翻译：

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基于振荡电路的混合直流断路器

随着直流输电技术的飞速发展，作为直流故障处理关键设备的直流断路器已成为学者们的研究热点。本文提出了一种新颖的混合直流断路器拓扑结构，以改善传统混合直流断路器的缺点。传统混合直流断路器使用过多的IGBT，体积大，成本高。这种拓扑结构的主要创新是在固态支路中串联使用机械开关，可承受大部分电压。振荡电路并联在机械开关上，可产生反向电流，使流经机械开关的电流为零，实现无电弧分断。基于 PSCAD 仿真平台验证了所提出拓扑的可行性。