DC fault detection method using current differential deviation in MTDC grid

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Abstract
Recently, the number of generation facilities using renewable energy is increasing, and HVDC attracts attention. With the proliferation of HVDC, it is expected that MTDC will be formed with complicated transmission system. Although HVDC is a promising system, there is a problem with system protection. For DC systems, faults must be detected and removed at high speed. Therefore, this paper proposes a fast fault detection method by measuring current slope using current differential information. With this proposed method, faults can be detected at high speed, and faulty areas and types can be distinguished.