极端条件下基于特征层面信号融合的电励磁双凸极电机匝间短路故障诊断研究

doi:10.19595/j.cnki.1000-6753.tces.220516

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Abstract

The Wound-Field Doubly Salient Machine (WFDSM) has the advantages of the simple structure and high reliability. It is suitable for aerospace and other applications in harsh environments. When an inter-turn short-circuit fault occurs, it is difficult to be distinguished by traditional diagnosis methods due to slight changes of currents and vibration. Therefore, a novel WFDSM inter-turn short circuit diagnosis method is proposed in this paper based on multi-signal fusion at feature level and improved Convolutional Neural Network(CNN).
Firstly, current and vibration data are collected from the 8-10 WFDSM. The 75 sets of four-phase current signals are processed by Empirical Mode Decomposition (EMD), and Intrinsic Mode Function (IMF) of length 101 are taken from each phase current. Thus, each condition of current feature matrix is 300 sets of length 101. At the same time, the wavelet packet transform is applied to the vibration signal, and each sensor gets kurtosis, margin and energy ratio of length 256. Thus, each condition of vibration feature matrix is 300 sets of length 768. Interval scaling, normalization, missing value processing and other feature processing are taken after two sets were arranged in parallel. Each group is randomly divided into training set and test set in the ratio of 4:1. After the input matrix is convolved and pooled, the data features are effectively preserved by batch normalization layer, next the flatten layer is laminated and finally passed to SoftMax classifier for diagnosis. The dropout layer is also applied in the diagnosis, while the learning rate is optimized to ensure the high classification efficiency and no overfitting occurs in the model.
The diagnosis results of different detection quantities show that, when only current signals are used, the accuracy can only reach 82.8% on 800r/min and 83.7% on 1000r/min; when only vibration signals are used, the accuracy can only reach 85.7% and 84.3%. In contrast, when the multi-signal fusion at feature level method is adopted, the accuracy can reach up to 98.3%, while the model convergence speed accelerates significantly. In order to simulate the extreme conditions, different degrees of white Gaussian noise are added to experiment. The accuracy of the fusion at feature level method barely changed when the SNR >20dB, which is still above 95%. Meanwhile, when SNR=10dB, the accuracy can still maintain 87.8%. By considering the accuracy and solving efficiency, the fusion at feature level method is superior to method of fusion at the data level or the result level.
The following conclusions can be drawn from the analysis of model theory and experimental data：1)The magnetic field of WFDSM will be distorted with additional harmonics generated when a short-circuit fault occurs, which also indirectly leads to the change of the current and vibration. 2)Compared with the single signal diagnosis method, the accuracy and convergence speed of the proposed model are greatly improved. 3)The proposed model performs better and has a strong anti-interference ability under the extreme conditions. 4) The features extracted by EMD and wavelet packet transform play a important role in fault identification, and the improved CNN also has a good classification effect.

Key words： Wound-field doubly salient machine empirical mode decomposition feature fusion improved convolutional neural network extreme conditions

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TM352

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	Zhao Yao
	Shen Chong
	Li Dongdong
	Lin Shunfu
	Yang Fan

Cite this article:

Zhao Yao,Shen Chong,Li Dongdong等. Research on Inter-turn Short circuit Diagnosis of Wound-Field Doubly Salient Machine Based on Multi-signal Fusion on Feature Level under Extreme Conditions[J]. Transactions of China Electrotechnical Society, 0, (): 8-8.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.220516 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/8

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