Circuit breaker residual life prediction method based on stage attention mechanism network model

Abstract

The invention relates to a phase attention mechanism network model-based circuit breaker residual life prediction method, which comprises the following steps of: firstly, acquiring a vibration signal in an opening process, then optimizing a VMD algorithm, decomposing the vibration signal by using the optimized VMD algorithm, and selecting a modal component with relatively high kurtosis for reconstruction; then, according to the energy-entropy ratio, a contact breaking vibration segment is extracted from the reconstructed vibration signal; and finally, a prediction model fusing a stage attention mechanism is established, the prediction model takes a one-dimensional convolutional neural network and a GRU network as a trunk network, the stage attention mechanism is divided into two stages, the first stage is a distributed attention mechanism applied to the one-dimensional convolutional neural network, weighting is performed on an input sample in time and feature dimensions, and the second stage is a distributed attention mechanism applied to the GRU network. And in the second stage, weighting is carried out on the time dimension again by applying a time step attention mechanism of the GRU network. According to the method, the contribution degree of important information on the time dimension and the feature dimension to the prediction result is enhanced, and the prediction precision is improved.

Description

technical field [0001] The invention belongs to the technical field of circuit breaker remaining life prediction, in particular to a method for predicting the remaining life of a circuit breaker based on a stage attention mechanism network model. Background technique [0002] The low-voltage power distribution system is a key part of the transmission and distribution network system, which plays an important role in transmitting electric energy to the load. A momentary interruption or abnormality of the power supply may lead to the paralysis or disorder of the transmission and distribution network system, and even cause safety accidents and huge Economic losses. Universal circuit breaker, as an important electrical switching device in low-voltage power distribution system, has a wide range of applications. On the one hand, as a dispatching control device for low-voltage power grids, it can perform on-off or off operations on specific power distribution lines according to powe...

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Problems solved by technology

[0003] Remaining useful life (RUL) prediction technology has been maturely applied in many fields such as bearings, aero-engines and lithium batteries, but in the field of circuit breakers, especially in the research on mechanical life prediction, there are obvious deficiencies. , this is mainly because the circuit breaker is a complex mechanical system, and it is technically difficult to achieve a more accurate life prediction

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