Robust semi-supervised modelling method and its application to fault detection in chemical processes

doi:10.11949/j.issn.0438-1157.20161205

CIESC Journal ›› 2017, Vol. 68 ›› Issue (3): 1109-1115.DOI: 10.11949/j.issn.0438-1157.20161205

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Robust semi-supervised modelling method and its application to fault detection in chemical processes

ZHOU Le¹, SONG Zhihuan², HOU Beiping¹, FEI Zhengshun¹

1 School of Automation and Electrical Engineering, Zhejiang University of Science and Technology, Hangzhou 310024, Zhejiang, China;
2 College of Control Science and Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China

Received:2016-08-30 Revised:2016-12-03 Online:2017-03-05 Published:2017-03-05
Contact: 10.11949/j.issn.0438-1157.20161205
Supported by:
supported by the National Natural Science Foundation of China (61603342),the Natural Science Foundation of Zhejiang Province (LQ15F030006) and the Educational Commission Research Program of Zhejiang Province (Y201636867).

一种鲁棒半监督建模方法及其在化工过程故障检测中的应用

周乐¹, 宋执环², 侯北平¹, 费正顺¹

1 浙江科技学院自动化与电气工程学院, 浙江杭州 310024;
2 浙江大学控制科学与工程学院, 浙江杭州 310027

通讯作者: 周乐,zhoule@zust.edu.cn
基金资助:
国家自然科学基金项目（61603342）；浙江省自然科学基金项目（LQ15F030006）；浙江省教育厅项目（Y201636867）。

Abstract

Abstract:

In most complex chemical processes, measurements are often collected with noises and some outliers. These contaminated data would have negative effect on the accuracy of data-based process modelling and fault detection. A new robust semi-supervised PLVR model (RSSPLVR) was proposed by consideration of the real measuring environment in chemical processes and extended to a nonlinear model K-RSSPLVR with a kernel methodology. In both RSSPLVR and K-RSSPLVR, a weighted coefficient based on sample similarity among all observations was used as prior checking parameter of probability model to effectively eliminate influence of outliers on modelling. Model parameter training was accomplished by analysis of the weighted dataset with EM algorithm and a fault detection scheme was developed. Finally, TE process simulation demonstrated effectiveness of the proposed modelling methods.

Key words: fault detection, robust model, semi-supervised learning, process control, process systems, principal component analysis

摘要：

复杂化工过程的观测样本往往包含着测量噪声与少量的离群点数据，而这些受污染的数据会影响数据驱动的过程建模与故障检测方法的准确性。本文考虑了化工过程测量样本的这一实际情况，提出了一种鲁棒半监督PLVR模型（RSSPLVR），并利用核方法将其扩展为非线性的形式（K-RSSPLVR）。此类算法利用基于样本相似度的加权系数作为概率模型的先验参数，能有效消除离群点对建模的影响。利用加权后的建模样本，本文通过EM算法训练了RSSPLVR和K-RSSPLVR的模型参数，并提出了相应的故障检测算法。最后，通过TE过程仿真实验验证了所提出方法的有效性。

关键词: 故障检测, 鲁棒模型, 半监督, 过程控制, 过程系统, 主元分析

CLC Number:

TP277

ZHOU Le, SONG Zhihuan, HOU Beiping, FEI Zhengshun. Robust semi-supervised modelling method and its application to fault detection in chemical processes[J]. CIESC Journal, 2017, 68(3): 1109-1115.

周乐, 宋执环, 侯北平, 费正顺. 一种鲁棒半监督建模方法及其在化工过程故障检测中的应用[J]. 化工学报, 2017, 68(3): 1109-1115.

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Robust semi-supervised modelling method and its application to fault detection in chemical processes

一种鲁棒半监督建模方法及其在化工过程故障检测中的应用

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