With the development of a distributed generation, direct current (DC) load and energy-storage equipment, voltage-source-converter-based medium-voltage DC systems (VSC-MVDC) have attracted more attention due to its low power consumption, high reliability, independent power control and so on. However, VSC-MVDC has the problem of DC fault isolation, which requires the fast-acting DC circuit-breakers to isolate faulty lines and ensure low cost. This problem can be solved by coordinating resistive type superconducting-fault-current-limiter (R-SFCL) and integrated-gate-commutated-thyristor (IGCT) based hybrid circuit breaker. Based on this, IGCT based superconducting DC circuit breaker (SDCCB) is proposed and analysed. Combining R-SFCL with IGCT could realise large current limiting and interruption and ensure low cost. In addition, the IGCT based hybrid DC circuit breaker (IGCT-HDCCB) is compared with the traditional insulated gate bipolar transistor (IGBT) based hybrid DC circuit breaker (IGBT-HDCCB) to evaluate which circuit breaker is more suitable for VSC-MVDC. The results show that, coordination based on R-SFCL and SDCCB, the fault current is successfully limited from 17.6 to 2.1 kA, and then interrupted within 3.8 ms. In addition, IGCT-HDCCB overcomes the disadvantage that IGCT has less interrupting capacity than IGBT, retains the advantage of low cost of IGCT and is more suitable for MVDC system.

中文翻译：

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基于集成门极换流晶闸管的超导混合直流断路器仿真研究

随着分布式发电、直流负载和储能设备的发展，基于电压源换流器的中压直流系统（VSC-MVDC）因其低功耗、高可靠性而受到越来越多的关注。 、独立电源控制等。但VSC-MVDC存在直流故障隔离的问题，需要快速动作的直流断路器来隔离故障线路并保证低成本。这个问题可以通过协调基于电阻型超导故障限流器（R-SFCL）和集成门极换流晶闸管（IGCT）的混合断路器来解决。在此基础上，提出并分析了基于IGCT的超导直流断路器（SDCCB）。R-SFCL与IGCT相结合，可实现大限流和分断，并保证低成本。此外，将基于IGCT的混合直流断路器（IGCT-HDCCB）与基于传统绝缘栅双极晶体管（IGBT）的混合直流断路器（IGBT-HDCCB）进行比较，以评估哪种断路器更适合VSC-MVDC。结果表明，基于R-SFCL和SDCCB的配合，成功地将故障电流从17.6 kA限制到2.1 kA，并在3.8 ms内中断。此外，IGCT-HDCCB克服了IGCT开断能力低于IGBT的缺点，保留了IGCT成本低的优点，更适合MVDC系统。