A Novel Adaptive STFT-SFA Based Fault Detection Method for Nonstationary Processes

被引:8
作者
Li, Daye [1 ]
Dong, Jie [1 ]
Peng, Kaixiang [1 ]
机构
[1] Univ Sci & Technol Beijing, Sch Automat & Elect Engn, Key Lab Knowledge Automation Ind Proc, Minist Educ, Beijing 100083, Peoples R China
基金
中国国家自然科学基金;
关键词
Fault detection; Feature extraction; Data models; Adaptation models; Wind turbines; Industries; Analytical models; Adaptive model; fault detection; nonstationary process; slow feature analysis (SFA); wind turbine (WT); STATIONARY SUBSPACE ANALYSIS;
D O I
10.1109/JSEN.2023.3264994
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
In the field of fault detection, the nonstationary characteristics caused by external disturbances of wind turbine (WT) and other reasons can mask the fault signals, while the inconsistent data distribution between training data and test data due to equipment loss and other reasons can lead to model mismatch problems, both of which can lead to the degradation of fault detection performance. In order to solve the above problems, a novel adaptive fault detection framework is proposed in this work. First, the stationary features of nonstationary variables are extracted based on short-time Fourier analysis, after which the features are combined with the stationary variables. Second, isolation-based anomaly detection using nearest-neighbor ensembles (iNNE) is introduced as monitoring metrics for designing the statistic for the slow feature analysis (SFA) method. Then, the differences between online normal data and training data are calculated, the model update factor and update strategy are designed, and an adaptive fault detection framework based on short-time Fourier transform-SFA (STFT-SFA) is proposed. Finally, the effectiveness of the proposed fault detection framework is verified using the Tennessee Eastman process (TEP) and actual WT data. The results show that the proposed STFT-SFA method has a 94.0% correct monitoring rate (CMR) for TEP failures, and the proposed adaptive STFT-SFA method has a 95.6% CMR for WT failures, which are better than other comparative fault detection methods.
引用
收藏
页码:10748 / 10757
页数:10
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