Active low-voltage power distribution network fault positioning optimization method based on hierarchical model

Abstract

The invention discloses an active low-voltage power distribution network fault positioning optimization method based on a hierarchical model. The active low-voltage power distribution network fault positioning optimization method comprises the following steps of: performing hierarchical equivalence on a power distribution network; setting a plurality of monitoring nodes and reporting monitoring information; encoding a fault state of a fault current information monitoring section reported by means of the monitoring nodes; constructing a monitoring node switching function of the power distribution network by utilizing a monitoring node switching state information matrix and a section state information matrix; introducing a decision-making variable Di of information distortion to form a faulthypothesis vector; and introducing a section state Si and a distortion factor into the design of the decision-making variable to design a target function. According to the active low-voltage power distribution network fault positioning optimization method, a weight coefficient of a key node is optimized, stability and precision of a positioning algorithm are provided, a fault information reporting threshold value is designed according to access conditions of distributed power supplies of an actual low-voltage power distribution network, the number of the distributed power supplies in the model is reduced, the hierarchical model is optimized, positioning efficiency and precision are improved, and the operation management level of a power supply department is improved.

Description

technical field [0001] The invention relates to the field of power grid fault processing, in particular to a layered model-based fault location optimization method for an active low-voltage power distribution network. Background technique [0002] With the rapid development of new energy technologies, a large number of small-capacity distributed photovoltaics are connected to the low-voltage distribution network, which also brings interference to the fault location of the low-voltage distribution network. In the fault location research of active low-voltage distribution network, due to the complex conditions such as short lines of low-voltage distribution network, many branches, many nodes, small capacity and large number of distributed power sources, the direction of fault current is different, and the traditional fault The location method is difficult to accurately locate the fault section, and the calculation process is too complicated due to the large number of nodes. C...

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Problems solved by technology

[0005] The present invention mainly solves the original technical problems of many equivalent source-containing areas and low fault location efficiency, and provides a layered model-based fault location optimization method for active low-voltage distribution networks. By optimizing the weight coefficients of key nodes, it provides The stability and accuracy of the positioning algorithm. At the same time, according to the access situation of distributed power sources in the actual low-voltage distribution network, the fault information reporting threshold is designed to reduce the number of distributed power sources in the model, optimize the layered model, and improve positioning efficiency and Accuracy, improve the operation and management level of the power supply department

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