Abstract: Due to the independent control of active and reactive power and no commutation failure, etc., voltage source converter based high-voltage direct current （VSC-HVDC） system is considered to be the development direction of the future power grid.However, the problem which quickly and efficiently isolates DC fault or AC fault becomes one of the important technical problems of VSC-HVDC system.In order to solve the problem of fault isolation and limit short-circuit current in VSC-HVDC system, the application of superconducting fault current limiter is considered seriously by people gradually. This paper proposes fault current limiting technique based on the resistive-type superconducting fault current limiter （R-SFCL）. Then, with utilizing the designed bipolar VSC-HVDC systems, this paper compares the feasible locations of R-SFCLs, when DC line-to-line, DC line-to-ground and three-phase AC faults are occurred, and proves the effectiveness of the proposed current limiting method. Finally, based on the simulation tests in PSCAD/EMTDC, this paper suggests the optimum locations of SFCLs in VSC-HVDC transmission systems.

Key words: voltage source converter based high-voltage direct current （VSC-HVDC）, fault isolation, fault limitation, resistive-type superconducting fault current limiter