Fault processing method and system for direct-current power distribution network

The invention discloses a DC power distribution network fault processing method and system. Comprising the following steps: monitoring bus anode and cathode DC voltage and anode and cathode DC current of each branch in a DC power distribution network; determining a fault bus polar line according to the change condition of the bus positive and negative pole direct current voltage; determining a fault line according to the change condition of the direct current of the fault bus polar line and the change condition of the direct current of the positive and negative poles of the branch corresponding to the fault bus polar line; according to the position of the fault line, determining a direct-current circuit breaker needing to be opened; and opening the direct-current circuit breaker, cutting off the short-circuit current in the direct-current power distribution network, and isolating the fault area. The fault can be quickly detected and the fault position can be judged, so that the direct-current circuit breaker