Seiitsu Nigawara

An operation support expert system based on on-line dynamics simulation and fuzzy reasoning for startup schedule optimization in fossil power plants

An expert system which can support operators of fossil power plants in creating the optimum startup schedule and executing it accurately is described. The optimum turbine speed-up and load-up pattern is obtained through an iterative manner which is based on fuzzy reasoning using quantitative calculations as plant dynamics models and qualitative knowledge as schedule optimization rules with fuzziness. The rules represent relationships between stress margins and modification rates of the schedule parameters. Simulation analysis proves that the system provides quick and accurate plant startups. >

Hierarchical function-structured and autonomous control systems for fossil power plants

A distributed digital monitoring and control system suitable for fossil-fueled power plants is described along with the associated minicomputers, communication devices, and man-machine interface devices. The corresponding hardware and software are also discussed. The system covers the plant-wide (distributed) monitoring and control functions including data acquisition, boiler control, burner management, turbine control, auxiliaries control, and protection. >