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PlantInput

Sensors

Redundantsensors

FDImathematical

model

Diagnosticlogic

Diagnosticlogic

FaultalarmOutput

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PlantActuators Sensors

Plantmodel

Input

u(t)

Faults

Output

y(t)

Residualgenerator

Model-basedfault detection

Residualevaluation

Residualsr(t)

Fault alarm

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Process

Residualgeneration

Residualevaluation

Input Output

Measurements

Residuals

Fault information

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PlantActuators

Controller

Referencesignals

Input

sensors

Output

sensorsFDI system

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PlantActuatorsInput

sensors

Outputsensors

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Plant

Inputsensors

Outputsensors

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PlantActuators

Outputsensors

Inputsensors

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Inputs Outputs

Plant

Residuals

Plant+

-

Residuals

Simulator oroutput estimator

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++

f(z)

u*(z)

System

y(z)

++

Residual generatorr(z)

H (z)u*

H (z)y

G(z)yu*

G (z)yf

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Parameterestimator

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Parameterestimation

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+

-

+++

+

+

+

+

+

+

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y

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t

tt z

z

z

z

z

zz

z

t

tt

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x x(t)+ u(t)(t+1) = A B

y x(t) = C (t)

u(t) y(t)

Delay line Delay line

WQ +

_ W

r(t)

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Plant

Pre-

Process

or

Fault

Model

1

NF

Classifier

Threshold

Evaluation

u

thu()

r1

y

Fault

Model

2

FaultModel

n

FF

Model

r0

r3

r2Fault

Indication

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Neuro-Fuzzy

Model

Online

parameter

estimation

Plant

y

y

r

u

+

-

-PhysicalParameters:

TCSG

S0

+

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10

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...

.... .

.

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. . .

.

...

..

.

.

... .

.

..

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+

+

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Process

Residual

generation

Residual

evaluation

R1

R2

Rm

F1

M1

F2

M2

FnMp

**

** *

*

Measurements(Process variables)

Residuals Faults

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Plant

TSK Neuro-Fuzzybased Observer

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Compressor TurbineCombustor

Controller

u(t)

Inputs

y(t)

Outputs

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0 500 1000 1500 2000 2500

-2

0

2

4

6

0 500 1000 1500 2000 2500-0.2

-0.1

0

0.1

0.2

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Cb

aQ

Q d

6

Os

yR

Trs

Ts Pv

9

1 2

43

7

H.P. M.P. B.P.

8

,

5

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u(t)

Plant

Model

y(t)

+

+

+_

r(t)

Output sensors

Residuals

y(t)^

Input sensors

f (t)y

f (t)u

++

u*(t) y*(t)

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0 20 40 60 80

40

45

50

55

60

65

0 20 40 60 80

0

0.05

0.1

0.15

0.2

0.25

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System

+u(t)u(t)~

Input sensors

Actuators

Controller

Output sensorsy(t)y(t)~

f (t)

f (t)

+

*

f (t)s

*

y

f (t)u

c

u*(t) y*(t)

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Combustor Turbine

av ff

Controller

ff Nt

f (t)s

Compressor

u(t)

y(t)

Compressor

Observer

+ -

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Time (s)

f (t)c

x 10-6

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Turbine

Observer

+ -

0 10 20 30 40 50 60 70 80 900

100

200

300

400

500

600

t3

n

(t)

3

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Time (s)

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0 10 20 30 40 50 60 70 80 90

0

0.1

0.2

0.3

0.4

0.5

0.6

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0 20 40 60 80

0

2

4

6

8

x 10-4

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Turbine

Observer

+ -

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Controller

Turbine

Compressor

Observer

+ -

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0 20 40 60 801

2

3

4

5

6

7

8

910

11x 10

5

0 20 40 60 80-4

-3

-2

-1

0

1x 10

-5

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0 20 40 60 80

-1

1

3

5

7x 10

-4

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y(t)

y(t)^ r(t)

u(t)System

Observer

Adaptiveparameterestimator

B(t)

+_

x(t)A(t)^ ^ ^

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System

f (t)s

Residualgenerator

f (t)u f (t)y

u(t) y(t)

+++ +

Inputs Outputs

Faultidentification

f (t)s^

,f (t)u f (t)y,^^

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