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Control reconfiguration of a boiler-turbine unit after actuator faults

Boiler-turbines are one of the most important parts in power generation plants. The safety problem in such systems has always been a special concern. This paper discusses the application of control reconfiguration by fault-hiding approach for a boiler-turbine unit. In Fault-hiding approach, nominal controller of the system remains unchanged; instead, a reconfiguration block is designed and placed between nominal controller and faulty plant to modify input signals when an actuator fault occurs. Setpoint tracking recovery and optimal performance recovery problems in order to diminish effects of actuator faults in the system are investigated. The results of simulations show that the reconfiguration has been successful in both cases and also confirm the applicability of the method for the boiler-turbine unit.