Transformer fault diagnosis method for optimizing random forest model based on particle swarm algorithm

Abstract

The invention discloses a transformer fault diagnosis method for optimizing a random forest model based on a particle swarm algorithm. The method comprises the steps: dividing a training set and a test set by taking a non-coding ratio of analysis data of dissolved gas in transformer oil as characteristic vector input; constructing a random forest model, and optimizing the random forest model through a particle swarm optimization algorithm to obtain two optimal parameters; and rebuilding a random forest model according to the obtained optimal parameters to identify the fault type of the transformer. According to the method, the fault diagnosis accuracy of the transformer is effectively improved, and a reliable basis is provided for operation and maintenance personnel to correctly judge theoperation condition of the transformer.

Description

technical field [0001] The invention relates to the technical field of power equipment monitoring, in particular to a transformer fault diagnosis method based on a particle swarm algorithm optimization random forest model. Background technique [0002] At present, the power system has developed into a cross-regional interconnected large power grid. As the energy conversion hub of the network, the transformer will seriously affect the stable operation of the power grid if it fails. The analysis of dissolved gas in oil can identify latent faults inside and outside the transformer and their development trend, which is a feasible method for diagnosing transformer faults recognized by the power industry. Therefore, the DGA data of the dissolved gas concentration in the transformer oil is the most intuitive and effective characteristic parameter of the transformer, which can provide a basis for diagnosing the state of the transformer. [0003] Based on the characteristics of diss...

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Problems solved by technology

[0003] Based on the characteristics of dissolved gas in transformer oil, so far, researchers have proposed many fault diagnosis methods, mainly including two: one is the traditional diagnosis method, such as IEC three-ratio method, Rogers four-ratio method, uncoded ratio method etc. These ratio discrimination methods are simple to operate, but they often show defects such as imperfect coding and absolute fault boundary distinction; the second is a machine learning model that uses the concentration ratio of dissolved gas in oil or the proportion of components as feature quantities to mine, and is commonly used There are artificial neural network (BPNN), support vector machine (SVM), etc. These machine learning models have effectively improved the accuracy of fault diagnosis and achieved certain results, but there are also certain defects.

For example, BPNN takes a long time to train, it is easy to fall into the local optimum, and it is difficult to obtain the global optimal solution; SVM is not sensitive to the selection of kernel functions, and it needs to combine multiple binary classifiers to solve the multi-classification situation, and it is difficult to obtain more accurate classification results.

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