Abstract
A cogeneration system, i.e., CGS, is the system that supplies both the electricity and hot water or steam to the plant in the case of emergency or on demand of low energy cost. Although this system is very important in the plant, only simple diagnosis techniques are often used. One of the reasons is that a system is very complicate and one trouble changes many parameters in the system. To operate the CGS with higher reliability and efficiently, an advanced diagnosis system is required. One of the techniques for an advanced diagnosis is model-based diagnosis, in which system load and outside air temperature etc. are taken into account. In this paper, first we built the CGS model including thermodynamic and kinetic characteristics, and then modified some parameters to simulate troubles. By identifying parameters in the model, we can recognize the occurrence of trouble and the location of a fault. Using proposed technique, we can detect faults in the system.
