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Research Papers: Gas Turbines: Controls, Diagnostics, and Instrumentation

Proportional Integral Derivative Based Fault Tolerant Control for a Gas Turbine

[+] Author and Article Information
Marino Sanchez-Parra, Dionisio A. Suarez

División de Sistemas de Control GCI 29-1, Instituto de Investigaciones Eléctricas, Reforma 113, Col. Palmira, Cuernavaca, Morelos 62490, Mexico

Cristina Verde

Instituto de Ingeniería, Universidad Nacional Autónoma de México, Coyoacán, DF 04510, Mexico

J. Eng. Gas Turbines Power 132(11), 111601 (Aug 12, 2010) (11 pages) doi:10.1115/1.4001053 History: Received June 02, 2009; Revised December 18, 2009; Published August 12, 2010; Online August 12, 2010

This paper presents a fault tolerant control switching scheme with embedded fault detection and isolation system for the gas turbine of a combined cycle power plant. Mechanical faults of the turbogenerator are considered as case study. Previous to the control design, the detection and isolation capabilities of the gas turbine are studied by applying structural analysis to a first principles based gas turbine model. As a result, a new sensor was suggested to improve the detectability and isolability with respect to mechanical faults and sensors faults. Furthermore, the active fault tolerant control developed is based on stabilizing families of proportional integral derivative (PID) controllers, which are tuned off-line and the plant switching scheme preserves the stability of the whole closed-loop system, thanks to a careful selection of controller according to fault conditions. Simulation results with nonlinear model show the potential of the procedure.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Gas turbine system description

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Figure 2

Gas Turbine conventional control

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Figure 3

Incidence matrix for the GT model

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Figure 4

Graph without redundancy

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Figure 5

Residual ARR11 detecting friction fault at 5000 s

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Figure 6

Fault tolerant control scheme

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Figure 7

Surface for the PID with kp=0.02 and performance indices GM=5 dB, PM=20 deg, and tr=200 s

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Figure 8

Electric power with nonlinear model with fault at 5000 s

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Figure 9

Response with linear model Pf1 and Cp1∗

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Figure 10

Response of the nonlinear model with faults

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