Fast single-end line protection method for the meshed multi-terminal HVDC grid

In view of the short‐circuit fault characteristics, the protection technique of the dc lines limits the development of the modular multi‐level converter (MMC)‐based HVDC grid in a large extent. This study derives the calculation formulas of the transient voltages of internal and external faults and proposes a single‐end protection scheme based on the transition period (TP) from the abrupt changing point to the first extreme point of the fault voltage. Due to the current‐limiting reactors, the TP of the internal fault is much shorter than that of the external fault, which is used to discriminate internal fault from external fault. A four‐terminal symmetrical bipolar HVDC grid based on MMC is modelled using PSCAD/EMTDC, and simulation results demonstrate the validity of the new proposed dc transmission line protection method.

Abstract licence: CC BY-ND

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