Grounding grid fault diagnosis method based on BP neural network

Abstract

The present invention discloses a grounding grid fault diagnosis method based on a BP neural network. The method comprises a step of simulating a grounding grid to be diagnosed as a plane lattice-like structure, selecting a pair of adjacent nodes as excitation nodes ad multiple pairs of adjacent nodes as m accessible test points, a step of establishing a grounding grid simulation circuit and applying DC power supply excitation, and orderly disconnecting a pair of adjacent accessible test points in the accessible test points to carry out measurement, establish multiple groups of test data and train the BP neural network, a step of applying DC power supply excitation to grounding grid excitation nodes to be diagnosed, generating an input vector according to the voltage of the accessible test points and inputting the input vector into the BP neural network, and diagnosing the fault branch of the grounding grid to be diagnosed according to an output vector. According to the method, the safe operation of the grounding grid is ensured, and the method has the advantages of accurate and reliable fault positioning, small on-site workload, fast diagnosis speed, high diagnosis efficiency, simple operation of fault diagnosis, and easy and convenient promotion.

Description

technical field [0001] The invention relates to a grounding grid fault diagnosis technology in a power system, in particular to a grounding grid fault diagnosis method based on a BP neural network. Background technique [0002] The safe operation of the grounding grid is a key factor to ensure the safe operation of the power system, and its anti-corrosion problem has become an urgent problem for power companies to solve. As the grounding of substation AC / DC equipment and lightning protection grounding in the power system, the grounding grid plays an important role in the safe operation of the power system. In the case of defects in the grounding grid, when the power system has a grounding short circuit defect or is struck by lightning, the potential of the grounding point of the equipment and the local potential difference on the ground surface will increase abnormally, directly endangering the lives of operating personnel and the safety of equipment. The conductor of the g...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: aiming at the complexity, uncertainty, corrosion and pollution of the resistance reducing agent in the prior art grounding grid fault inspection, to provide a guarantee for the safe operation of the grounding grid. Accurate and reliable positioning, less on-site workload, fast diagnosis speed, high diagnosis efficiency, less on-site workload, simple operation of fault diagnosis, and easy promotion of grounding grid fault diagnosis method based on BP neural network

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