A Study On Predictive Control Technology And Its Appilications In The Process Industry

The Predictive Control strategy has been developing quickly both in the theories research and application, with its three characteristics of predictive model, receding horizon control construction and feedback correction meeting the industrial process control's needs. The Predictive Function Control is one of the most novel direction in this area, and it applies in the fast-processes initially, such as robot's arm control and radar tracking control, now it applies also in the slow-processes, such as fitful reaction temperature control, etc. The theory and application of the Predictive Control are studied in this paper. On the theory, the Predictive Function Control method based on the state space is discussed and the simulation results validate the PFC method's advantages on robust and anti-jamming comparing with PID method by computer simulation. The application research includes the application of the software of Predictive Function Control (APC-PFC) and the software of the Multiple-variables Predictive Control (APC-Hiecori). The former were applied in the temperature control Chlorinating process and PH control in the process of zymolysis of penicillin, the latter were applied in the advanced control of reclaim equipment of lox in China Petroleum & Chemical Corporation Yangzi Petrochemical Co., LTD. The main works are summed up as following: The basic concepts and the development of the Advanced Control and the Predictive Control are stated with the focus on the effects of the Advanced Control on the process industry in our country after the author has studied a lot of references. The Predictive Function Control is discussed in detail. Considering the step function as an example, the stability and robustness of the PFC system are analyzed through the discrete system structure and the inter-model control system characteristics. The Predictive Function Control is proved to be a simple-computation, robust, anti-jamming and high precision control method by detail simulation study. The Predictive Control comes into being from the industry production field, and it returns to the industry field to solve the practical control problems. The Predictive Function Control is one of new predictive control methods and thecorresponding software packet ofAPC-PFC is introduced. This method is provedto be much better than PID control with the advantages of fast-tracking, highprecision, non-oversheet through three applications in the industry process.The Multiple-variables Predictive Control strategy and the correspondingsoftware packet of APC-Hiecon are introduced. The results of its application inthe process control show this method can guarantee the system's stability andsecurity furthest, optimize the operation point of process and enhance theproductivity.The future research and development of the theory and application in this areaare also presented.