Fault Estimation For The Water Level System Of Steam Generator Based On LMI

The steam generator plays an extremely important role in the nuclear power stationwhich is the hub between first loop and second loop. In recent years, the accident rates of thesteam generator are always high, safety reliability and the economy of nuclear power plant areaffected seriously by the risk of accidents.Therefore, fault diagnosis is very important forensuring reliable operation of the steam generator, and reducing losses.Fault diagnosis is an effective way to improve system reliability and safety. The waterlevel of steam generator is a complex time-varying system with characters such asnon-minimum phase, strong non-linear, strong interference and so on. In order to diagnoseand estimate fault of the steam generator water level system, fault estimating (control) deviceshave been added to the original steam generator water level control system, the purpose is tomake system in fault signal and outside factors work normally, and detect the time and size ofit.Based on Irving’s steam generator water level system model, the study of this paper is topropose a polytope linear parameters varying water level system model with fault information.Via two methods of observer and output feedback, which achieve the water level system’sgain schedulingH∞control and fault estimation, the water level controller/fault estimator isdesigned respectively by local stable work process analysis and global stable work processanalysis, simulation studies have shown its effectiveness and feasibility.