Model-based robust fault detection and isolation of an industrial gas turbine prototype using soft computing techniques

Authors:
Hasan Abbasi Nozari;Mahdi Aliyari Shoorehdeli;Silvio Simani;Hamed Dehghan Banadaki
Affiliations:
Department of Mechatronics, Faculty of Engineering, Islamic Azad University, Science and Research Branch, Tehran, Iran;Mechatronics Group, Faculty of Electrical Engineering, Khaje nasir Toosi University of Technology, Tehran, Iran;Department of Engineering, University of Ferrara, Via Sargat, IE-44122 Ferrara (FE), Italy;Department of Mechatronics, Faculty of Engineering, Islamic Azad University, Science and Research Branch, Tehran, Iran
Venue:
Neurocomputing
Year:
2012

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Abstract

This study proposes a model-based robust fault detection and isolation (RFDI) method with hybrid structure. Robust detection and isolation of the realistic faults of an industrial gas turbine in steady-state conditions is mainly considered. For residual generation, a bank of time-delay multilayer perceptron (MLP) models is used, and in fault detection step, a passive approach based on model error modelling is employed to achieve threshold adaptation. To do so, local linear neuro-fuzzy (LLNF) modelling is utilised for constructing error-model to generate uncertainty interval upon the system output in order to make decision whether a fault occurred or not. This model is trained using local linear model tree (LOLIMOT) which is a progressive tree-construction algorithm. Simple thresholding is also used along with adaptive thresholding in fault detection phase for comparative purposes. Besides, another MLP neural network is utilised to isolate the faults. In order to show the effectiveness of proposed RFDI method, it was tested on a single-shaft industrial gas turbine prototype model and has been evaluated based on the gas turbine data. A brief comparative study with the related works done on this gas turbine benchmark is also provided to show the pros and cons of the presented RFDI method.