A fault identification scheme for protection and adaptive reclosing is proposed for a hybrid multi-terminal HVDC system to increase the reliability of fault isolation and reclosing. By analyzing the “zero passing” characteristic of current at the local end during the converter capacitor discharge stage

the fault identification scheme is proposed. The distributed parameter-based fault location equation

which incorporates fault distance and fault impedance

is developed with the injection signal and the distributed parameter model during the adaptive reclosing stage. The fault distance is determined using a trust region reflection algorithm to identify the permanent fault

and a fault identification scheme for adaptive reclosing is developed. Simulation results show that the proposed scheme is suitable for long-distance transmission lines with strong anti-fault impedance and anti-interference performance. Also

it is less affected by communication delay and DC boundary strength than existing methods.