Fault location method for a low-voltage active power distribution network

The invention discloses a fault location method for a low-voltage active power distribution network. The fault location method comprises the following steps: S1, collecting fault information; S2, establishing a distorted information model; S3, establishing a layered equivalent model; and S4, outputting a result. In the step S1, a feeder terminal unit is installed at a section switch or an interconnection switch of a detection line, the feeder terminal unit collects fault information and uploads the fault information to a data acquisition and monitoring control system, and a distorted information model and a layered equivalent model are established in the data acquisition and monitoring control system. In the step S2, the establishment of the distorted information model comprises the following steps: S21, encoding fault detection information; S22, classifying the characteristics of distorted information; S3, determining a decision variable; S24, determining an objective function; and S25, determining a switchi