直流配电网交错串联式固态断路器

Interleaved Series Solid State Circuit Breaker of DC Distribution Network

鉴于有源直流配电网的故障特性,能够快速有效切除故障电流的固态直流断路器对提高直流配电网的供电可靠性意义重大。为此,提出一种交错串联式固态断路器,其拓扑将多个内层单元串联交错以提高整体耐压能力,每个内层单元由多个串联的常通型SiC JFET开关管组成,电路拓扑具有极强的可扩展性。通过双层均压网络实现串联开关的快速响应、动静态电压平衡。基于LTspice软件构建4.5 kV/20 A固态断路器仿真,仿真结果表明额定工况下该断路器关断时间仅为80 ns,验证了所提交错串联式固态断路器拓扑可行性。

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.