The Internal Model Control And Imc-pid Control And Its Applications

In this paper, three fundamental issues of robust control are discussed, which are model uncertainty description, nominal performance, robust stability and robust performance. There are two ways by which model uncertainty is described, they are norm-bounded uncertainty regions and general uncertainty regions. Consequently, two methods are discussed in this paper to deal with robust stability and robust performance.The methods discussed in robust control is used to construct a IMC controller. The detailed procedure is : establishing the uncertainy region of the model. designing a controller which ensure the nominal performance. tuning the fiter time constant to yield a IMC controller which guarantee robust stability and robust performance.This method is applied to deadtime uncertainty and three-parameter uncertain first order process with deat time(FOPDT). The tuning effect is very pleasing.Internal model control-based PID (IMC-PID) controller and its application is researched for FOPDT and SOPDT(second order process with deat time). Detailed IMC-PID controllers which have filter time constant as their only tuning parameter for processes mentioned above is acquired. Tuning results of such controller are put forward as well.A automatic tuning IMC-PID controller application software is developed in this paper for the first time. The software will be implemented as a part of computer control in atmospheric and decompressing plant in Kelamayi petrochemical factory.