Copyright © IFAC Fault Detection, Supervision and Safety for Technical Processes. Budapest. Hungary, 2000 FAULT DIAGNOSIS OF A SIMULATED MODEL OF AN INDUSTRIAL GAS TURBINE PROTOTYPE USING IDENTIFICATION TECHNIQUES R. J. Patton· • School of Engineering, University of Hull Cottingham Road. Hull HU6 7RX, UK Phone +44 01482 46 5878. Fax +44 01482 46 6006. e-mail: r.j.patton<oeng.hull.ac . uk S. Simani·· .* Dipartimento di Ingegneria, UniversitO. di Ferrara Via Saragat 1, 44100 Ferrara - ITALY Phone +39 0532 293839. Fax +39 0532 768602 e-mailssimani<Oing.unife.it S. Daley and A. Pike"· ... ABB-Alstom Power Cambridge Road. Whetstone. Leicester, LE8 6LH Phone +44 (0) 116 201 5638. Fax +44 (0) 116 201 5464 e-mail {andrew.pike.steve.daley}<Oenergy.alstom.com Abstract: This paper presents a model-based procedure for the detection and isolation of faults in an industrial gas turbine system. The diagnosis system is based on output observers designed in both deterministic and stochastic environments. A model of the process under investigation is obtained by identification procedures. Residual analysis and statistical tests are used for fault detection and isolation, respectively. The proposed designs have been evaluated using non-linear simulation, based on gas turbine data. Copyright @2000 IFAC Keywords: Analytical redundancy, fault detection and isolation, fault diagnosis, model-based approach, system identification, industrial gas turbines. 1. INTRODUCTION Control devices which are exploited to improve the overall performance of the industrial processes involve both sophisticated digital system design techniques and complex hardware (sensors, actu- ators, processing units). In this way, the prob- 511 ability of failure occurrence on such equipment may be significant. An automatic supervision con- trol should be used which is capable of isolating anomalous working conditions as early as possible. Fault detection and isolation (FDI) in linear time- invariant dynamic processes has received great attention during the last two decades and a wide