Power distribution network power transmission line fault positioning method and system

The invention discloses a power distribution network power transmission line fault positioning method and system, and relates to the technical field of power transmission line monitoring, and the method comprises the steps: obtaining traveling wave transient signals of measurement points at two ends of a power transmission line; performing multi-scale wavelet decomposition on the traveling wave transient signal by using discrete wavelet transform, and calculating to obtain a modulus maximum and traveling wave transient energy of the traveling wave transient signal; preprocessing the data; and inputting the preprocessed modulus maxima and traveling wave transient energy into a distance measurement model based on an improved BP neural network, and outputting a final fault distance measurement result. Wherein the training process of the distance measurement model comprises the step of carrying out iterative training on the BP neural network based on an improved evaluation function of a random correction network