Power distribution network failure cause analyzing method based on expert system and D-S evidence theory

Abstract

The invention relates to a power distribution network failure cause analyzing method based on an expert system and the D-S evidence theory. The method comprises the steps that information needed by power distribution network failure cause analysis and the source of the information are determined firstly, and the needed information comprises failure information and non-failure information; then, primary failure cause analysis is carried out through the expert system, and primary conclusions are obtained; finally, each primary conclusion is adopted as a basic trust distributive function, the basic trust distributive functions are integrated into a final basic trust distributive function through the combination mode of the D-S evidence theory, the final basic trust distributive function is the final conclusion, and the power distribution network failure cause is obtained. According to the method, the most precise conclusion of the failure cause is obtained according to various kinds of information based on reasonable derivation, therefore, the power supply reliability of a power distribution network can be overall improved, and economic benefits can be improved.

Description

technical field [0001] The invention relates to a method for analyzing the cause of a distribution network failure, in particular to a method for analyzing the cause of a distribution network failure based on an expert system and D-S evidence theory. Background technique [0002] In modern power systems, large-scale power plants are often far away from the load center. The power generated by the power plant is generally sent to the load center through a high-voltage or ultra-high-voltage transmission network, and then the power is distributed to different voltages by a network with a low voltage level in the load center. level users. This kind of network that mainly distributes electric energy in the power grid is called a power distribution network. The power distribution network mainly supplies electricity for a region, so it is also called the local power network. Compared with the regional power network, its voltage level and power supply range are smaller, but its big...

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Problems solved by technology

[0004] At present, there is almost no in-depth research on the analysis of the fault causes of the distribution network. Now the main method for finding the cause of the fault in the distribution network is the manual line inspection method. The manual line inspection method is mainly based on the fault indicator on the line or distribution automation. The fault area indication is located, and the fault point on the distribution line is found through the step-by-step patrol of the staff, and the cause of the fault is found by carefully checking the fault point; but this method not only wastes manpower, but also takes a long time to find the cause of the fault , the efficiency is low, especially for a wide range of rural distribution networks, due to the inconvenient transportation and harsh environment due to geographical conditions, this search method takes a longer time

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