U-tube Steam Generator Fault Detection Using Fuzzy Model

Zuheir Ahmad


In safety critical system like power plant system,
the problem of detecting the occurrence of faults is of paramount
importance due to their disastrous consequences. To allow
efficient performance under different operating conditions, a
power plant system requires the integration of many subsystems.
This results in a complex system which will inevitably be
subjected to faults caused by actuators, sensors or subsystems
faults during operation. One of the major subsystems, in power
plant is U-tube Steam Generator (UTSG). This paper is
concerned with Fault Detection and Isolation (FDI) of UTSG
system using fuzzy model. These methods aims at checking the
consistency between observed and predicted behaviour by
residuals. When an inconsistency is detected between the
measured and predicted behaviours obtained using a faultless
system model, a fault can be indicated. Simulation results
presented in the final part of the paper confirm the effectiveness
of this approach.


Fault detection; Fuzzy model; PWR Power Plant; Steam generator

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