Accurate fault location method suitable for multi-power distribution line

The invention discloses an accurate fault location method suitable for a multi-power distribution line, and the method comprises the following steps: enabling a positive sequence injection current ofa fault point to be equivalent to a virtual injection current of nodes at two ends of a fault region, and determining the relation between a positive sequence fault voltage vector and a virtual injection current vector; converting the relation between the positive sequence fault voltage and the virtual injection current into a node voltage equation based on amplitude calculation; solving the nodevoltage equation based on amplitude calculation by using a compressed sensing theory, and reconstructing the virtual injection current vector in the node voltage equation so as to locate the fault region; and solving the voltage amplitude of the nodes at two ends of the fault region by using the reconstructed virtual injection current vector, thereby realizing fault location. Through the method, the fault positioning effic