Interleaved Series Solid State Circuit Breaker of DC Distribution Network

doi:10.3969/j.issn.1008-0198.2024.01.012

Abstract

Abstract: Facing the fault characteristics of DC system, DC circuit breaker that can quickly and effectively cut off the fault current is of great significance to improve the power supply reliability of the DC distribution network. This paper proposes an interleaved series solid state circuit breaker. The topology interleaves multiple internal units in series is proposed to improve the overall withstand voltage capability. Each internal unit is composed of multiple normally-on SiC JFET in series. The circuit topology has strong scalability. The fast response, dynamic and static voltage balance of the series switch are effectively realized through the double-layer voltage sharing network. Based on sofware LTspice, a simulation of a 4.5 kV/20 A solid-state circuit breaker is constructed, and the simulation results show that its rated shutdown time is only 80ns, verifying the feasibility of the proposed ISSSBS topology.

Key words: DC distribution network, solid state circuit breaker, interleaved series, dynamic and static voltage balance

CLC Number:

TM561

ZHOU Qianfan, WAN Dai, HE Zhixing, LI Zongjian. Interleaved Series Solid State Circuit Breaker of DC Distribution Network[J]. Hunan Electric Power, 2024, 44(1): 85-93.

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