Artificial neural network-based fault positioning method of ultrahigh-voltage DC power transmission line

Abstract

The invention discloses an artificial neural network-based fault positioning method of an ultrahigh-voltage DC power transmission line. The artificial neural network-based fault positioning method comprises the following steps of acquiring a fault voltage signal and a current signal of measurement points at two sides of a DC line; decoupling to obtain linear mode components; performing wavelet transformation on the linear mode components to obtain different scale signals, and solving amplitude ratio of an initial wave head; training a neural network by taking the amplitude ratio of the initialwave heads of the linear mode components of the obtained voltage signal and the obtained current signal as an input sample of the neural network and fault distance as an output sample set to form a fault distance-measurement neural network, inputting a test sample of the amplitude ratio of the initial wave heads of the linear mode components of the voltage signal and the current signal into the trained neural network to obtain fault distance; and performing result optimization by a global geometric mean optimal method. By the artificial neural network-based fault positioning method, the faultdistance measurement of the power transmission line can be achieved, and the artificial neural network-based fault positioning method has the advantages of relatively high accuracy and high transition resistance endurability.

Description

technical field [0001] The invention relates to a fault location method of an extra-high voltage direct current transmission line based on an artificial neural network, and belongs to the technical field of power system line protection. Background technique [0002] UHV DC transmission has the advantages of large transmission capacity, long power transmission distance, and narrow line corridor, so it has obvious advantages in long-distance power transmission. my country's vast territory and the reverse distribution of energy and load determine that UHV DC transmission technology has broad application prospects in my country. The DC transmission line is the component with the highest failure rate in the DC system. Since the DC transmission line is generally long, the terrain along the line is complex, and the environment is harsh, it is extremely difficult to accurately find the fault point through line inspection, which seriously affects the recovery of permanent faults. ti...

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Problems solved by technology

It has low requirements on sampling rate and high reliability, but is affected by the accuracy of

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