The fault current of DC circuit in flexible DC distribution network is characterized by fast rising rate

high peak and rapid development

which increases the difficulty of designing DC circuit breaker. Based on the strong controllability of the transmitter converter

a fault current limiting control strategy was presented

by which the resistance of the DC line can be increased on the condition whether the DC side fault occurs or not

and the virtual resistance value can be adjusted adaptively. And simulation tests were carried out to verify the effectiveness of the theoretical analysis in Matlab/Simulink.Results show that

when the DC line fails

part of the capacitive energy is fed into the AC network quickly with the proposed current limiting control strategy

thus the peak value of the fault current

the current changing rate and the breaking stress of the DC circuit breaker are effectively reduced. The proposed strategy has a negligible influence on the steady state and transient characteristics of the normal operation of the system while effectively limiting the fault current.