Abstract
PID control schemes have been widely used in most process control systems represented by chemical processes for a long time. However, it is still a very important problem how to determine or tune the PID parameters, because these parameters have a great influence on the stability and the perfonnance of the control system. In this paper, a new evolutionary tuning algorithm of PID parameters is proposed. A suitable set of PID parameters is calculated based on the relationship between the generalized predictive control(GPC) and the PID control. Then, the GPC includes some user-specified parameters. The suitable value of the user-specified parameter is sought by the genetic algorithm(GA). According to the proposed scheme, the search area of PID parameters is sharply reduced, and the computational burden is drastically shortened.
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