Investigation on Dynamics of SFCLs Combined With H-DCCB in MTDC Distribution System

Multiterminal DC (MTDC) distribution systems have a sharply rising speed and high fault current. Superconductor fault current limiter (SFCL) can effectively mitigate this issue. While several topologies of SFCLs have been proposed, no comparative analysis of their current limiting performance in combination with dc circuit breakers (DCCBs) in MTDC distribution systems has been conducted. In this article, three types of SFCLs are modeled, including the resistive SFCL (R-SFCL), saturated iron core SFCL, and hybrid SFCL for a four-terminal ±10 kV dc distribution system, and the fault current is computed. In addition, the application of three types of SFCLs on H-DCCB is studied, and the factors that affect the current limiting performance of SFCLs are discussed. Furthermore, a comparative analysis of the interrupting performance of H-DCCB combined with different types of SFCL is investigated. The results show that when the operating speed of H-DCCB is quick, the R-SFCL is the most suitable for limiting the fault current in MTDC distribution system.