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Fault Section Location Method of DC Distribution Network Based on Current Direction Characteristics

This paper proposes a fault section location method based on the product of adjacent current directions for two-terminal DC distribution network. Firstly, the topology and operation mode of DC distribution network are presented. Secondly, the DC lines are divided into several sections based on the idea of distributed location. By transmitting the information of fault current directions between adjacent protection devices, the fault section is located and fault type can be identified. The current differential criterion is added to avoid misjudgment caused by power flow reversal and the setting value is calculated by the DC side fault characteristics analysis. The proposed method does not require strict data synchronization with less data communication and can be applied to DC distribution networks under different operation modes. Finally, simulation results in PSCAD/ EMTDC verify the validity and accuracy of the proposed scheme, which can accurately locate the fault section under the different conditions of fault points, fault types and operation modes.