The Research Of APC Software Based On Fuzzy-PID Control

It is very important and necessary to apply these advanced software technology into the design of advanced process control (APC) software because of the development of Internet and software. There are several limitations in existing APC software products as follows: (1) poor function and low integration; (2) appropriative driver with poor open-ability; (3) inflexible structure with poor adaptability. Thus this paper mainly studies the design and development of APC software based on OPC technique.The paper summarized and studied the distributed component technique, e.g. COM/DCOM and OPC specification, and then put forward the design mode of APC software. Afterwards, the fuzzy control software package has been designed and developed based on OPC technique. The research works can be summarized as follows:1) The history of distributed component technique, the basic principle of COM/DCOM and its application in the industrial automation have been dissertated. Then, the well-known realization of applying COM/DCOM in industry automation, e.g. OPC, has been discussed about its specification, special background, communication mode, application framework in industry automation and the running environment configuration of its server and client. In conclusion, the method of using OPC to design APC software has been brought forward.2) Based on fuzzy control , fuzzy-pid control software package has been designed. The total framework of the software package has been presented. Its function modules have been designed in detail. This software package has good open-ability, flexibility, reliability.3) For the boiler combustion system who is a non-linear characteristics and large inertia industrial process , a fuzzy-pid algorithm has been presented based on the control experience recently.4)The realization method of the fuzzy control software package was researched based on CENTUM CS1000 DCS system. The detail approach was using CS1000's function block window to configure the the boiler combustion system, using OPC automation interface to access process data and then depositing them to database, applying fuzzy-pid algorithm to calculate the optimization manipulated variable and download it back to CS1000 by OPC interface.Finally, on the basis of the summarization of the research work in this dissertation, the further development about APC software is discussed.