The multi-terminal flexible DC transmission system will emerge a large fault current

when the DC side fault occurs.Thus

a fault current limiting device needs to be installed on the DC side.This paper takes the Nan’ ao multi-terminal flexible DC transmission project as an example.First

the simulation model of Nan’ ao multi-terminal flexible DC project with resistance superconducting current limiter is built on the PSCAD/EMTDC;Secondly

in the case of an inter-electrode short-circuit fault condition on the DC side of the simulation system

the fault current limiting effects of the resistance-type superconducting current limiters（RSFCL） with different maximum resistance values are compared and analyzed

thereby the maximum resistance value of the RSFCL can be determined;Furthermore

A comparative analysis by simulation was conducted to determine whether a resistive current limiter was used

for an the negative ground fault occurred on the DC side of the simulation system.The simulation results show that the RSFCL can effectively suppress the short-circuit fault current

which can reduce the system’s requirements for the DC circuit breaker and improve the safety of system operation.