In order to solve the problem of fault location accuracy in active distribution system affected by the distortion of fault alarm information

a fault location method for active distribution system that integrates the voltage loss alarm information of the distribution transformer terminal unit and the over-current alarm information of the feeder terminal unit is proposed.Firstly

a mapping relationship between alarm information and the topology structure of the distribution system is established

and interval functions and switch functions are constructed to obtain the expected values of fault alarm information. Then

taking the minimum difference between actual alarm information and expected alarm information as the objective function

gray wolf optimization algorithm based on particle swarm optimization is used to solve the fault interval location of a single information source

multi-source information fusion to get the final positioning result.Finally

taking the IEEE 33-bus system with distributed generation as an example for simulation testing

the fault location results of single information source and multi-source fusion are compared under different numbers of distortion points

verifying that the method has strong fault tolerance

and can improve the accuracy of fault location in active distribution system

and the location timeliness can meet the actual operation requirements of distribution system.