An electric power generating plant is a very large and important public utility. For this reason, if an accidental failure, a trip, occurs, it can cause enormous economical loss and trouble for the public.
Trips are occurred by various reasons, but quite a portion of these is due to faults in the electronic analog controller.
In this thesis, an efficient method is suggested by which a fault tolerant control system is achieved over the boiler system of a thermal power plant. Essentially, the method is to place the hardware redundancy, i.e. a backup controller with fault detecting capability.
The backup controller is based on a micro computer with a data acquisition system and a switching system, which contains many subprograms for backup control. Each subprogram corresponds to a part of original control loops i.e. 'backup section', and backup control can be performed for one section at a time.
The control system of ULSAN thermal power plant was examined, all the details of the backup control system was designed, and related software except fault detecting algorithm was developed. In addition, practical problem such as bumpless transfer was also considered. To demonstrate the performance of the backup controller, an experiment was carried out by hardware simulation.
