A Fault Location Method for Low-Voltage Active Distribution Network

Abstract

The invention discloses a low-voltage active distribution network fault location method, comprising the following steps: S1: collecting fault information; S2: establishing a distortion information model; S3: establishing a layered equivalent model; S4: outputting results, the In step S1, the feeder terminal unit is installed at the section switch or tie switch of the detection line. The feeder terminal unit collects fault information and uploads it to the data acquisition and monitoring control system. The data acquisition and monitoring control system establishes a distortion information model and layering equivalent model. In the step S2, the establishment of the distortion information model follows the following steps: S21: coding of fault detection information; S22: classification of characteristics of the distortion information; S23: determination of decision variables; S24: determination of an objective function; S25: determination of a switching function. When the information is distorted, the method can still locate the fault section, obtain the type and location of the distortion, and effectively ensure the accuracy and fault tolerance of the low-voltage distribution network fault location when the information is distorted.

Description

technical field [0001] The invention relates to the technical field of power line fault diagnosis, in particular to a fault location method for a low-voltage active distribution network. Background technique [0002] With the gradual increase of power load and the large-scale access of distributed power generation (DG) to the power grid, the structure and flow of the power distribution system are increasingly multi-branched and complex, and the user's requirements for power supply reliability are improved. The low-voltage distribution network Fault location has gradually gained the attention of researchers. The general measures for power line fault information collection are: the feeder terminal unit (FTU) installed at the line section switch or tie switch uploads the collected fault information to the data acquisition and supervisory control system (SCADA), and starts the fault location software to judge faulty section. However, errors such as packet loss, delay, and nois...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of inaccurate determination of the fault location by the background system after the information of the fault line is distorted, and proposes a fault location method for low-voltage active distribution networks, based on the analysis of fault monitoring information and its distortion type On the basis of the information distortion factor, a distortion information model is established. According to the structural characteristics of the multi-branch of the low-voltage distribution network, a hierarchical solution method for fault location is proposed on the basis of establishing the equivalent model of the branch structure fault.

Images