A fault diagnosis and classification evaluation method for intelligent distribution network lines

Abstract

The invention discloses a fault diagnosis and classification evaluation method of an intelligent distribution network line. The steps include: 1. Obtaining the three-phase voltage signal U of the power grid online a (t), U b (t), U c (t); 2. The three-phase voltage signal is decomposed into 5 layers by discrete wavelet, and the a5 signal is used to reconstruct the three-phase voltage characteristic signal u a (t), u b (t), u c (t); 3. Fourier transform, calculate the phase information of the three-phase voltage 4. Draw a polar coordinate diagram, and obtain a matrix Z of n*n size through grayscale binary conversion a ,Z b ,Z c ; 5. Calculate the characteristic matrix C, D and the characteristic parameter V to obtain the characteristic coefficient E of the three-phase voltage a ,E b ,E c ; 5. According to the characteristic coefficient E a ,E b ,E c Determine the status of the smart distribution network line. The invention can accurately judge the fault type, is beneficial to fault phase selection and accident analysis, thereby improving the power supply reliability of the power grid and ensuring safe operation and maintenance efficiency of the power grid.

Description

technical field [0001] The invention relates to the field of line fault detection of an intelligent distribution network, in particular to a detection and evaluation method for a short circuit fault of a power grid. Background technique [0002] The power grid is an efficient and fast energy transmission channel and an optimized configuration platform. It is a key link in the sustainable development of energy and power. It plays an important pivotal role in the modern energy supply system and is related to national energy security. With the comprehensive construction of intelligent, digital, and information technology power grids, the data in the power industry has shown an explosive growth trend. The power system in operation generates a large amount of information, and the incidence of faults in the increasingly complex power grid system also increases. Naturally, Or the impact of human factors on the power grid is becoming more and more obvious, causing frequent failures,...

AI Technical Summary

Problems solved by technology

[0003] In order to meet the needs of the people for the power grid, some automation-based equipment and devices have been widely used. When a fault occurs, the corresponding circuit breaker and other devices will respond immediately and give a series of alarm information, but the content of these alarm information is complicated. Or there are misstatements and omissions, resulting in the safety and reliability of the power grid being unable to be guaranteed

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