Progress in root cause and fault propagation analysis of large-scale industrial processes

Authors:
Fan Yang;Deyun Xiao
Affiliations:
Department of Automation, Tsinghua University, Beijing, China and Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, Canada;Department of Automation, Tsinghua University, Beijing, China
Venue:
Journal of Control Science and Engineering
Year:
2012

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Abstract

In large-scale industrial processes, a fault can easily propagate between process units due to the interconnections of material and information flows. Thus the problem of fault detection and isolation for these processes is more concerned about the root cause and fault propagation before applying quantitative methods in local models. Process topology and causality, as the key features of the process description, need to be captured from process knowledge and process data. The modelling methods from these two aspects are overviewed in this paper. From process knowledge, structural equation modelling, various causal graphs, rule-based models, and ontological models are summarized. From process data, cross-correlation analysis, Granger causality and its extensions, frequency domain methods, information-theoretical methods, and Bayesian nets are introduced. Based on these models, inference methods are discussed to find root causes and fault propagation paths under abnormal situations. Some future work is proposed in the end.