Temporary faults often occur on overhead transmission lines of flexible DC grid

so reclosing scheme is the key measurment to inprove the reliability of power supply. However

reclosing may result in overcurrent and overvoltage again

and thus influence the safe operation of the system. A simple and effective calculation of the reclosing current limiting resistance is first proposed. The constraint relation between the arm current and current limiting resistance is established by estimating the maximum arm current

so the overcurrent in the bridge arm of the converter can be limited to a reasonable level and the converter blocking time can be avoided during reclosing. Then

the cause of overvoltage across the converter is analyzed

and a novel voltage limiting circuit

which composed of a thyristor and energy absorption resistance is proposed

which is in parallel with the arm reactor and can provide additional current path for arm reactor when the DC circuit breaker trips. Consequently

the transient overvoltage of the system can be prevented effectively. At last

a three-terminal DC test system with ring topology is modeled in PSCAD software

and a large number of simulation results verify the effectiveness of the proposed method.