A control method for a process control system

Abstract

The invention belongs to the technical field of process control, and in particular relates to a control method of a process control system. The controlled object of the present invention is described by first-order inertia plus pure delay transfer function, and the parameters to be identified in the controlled object are identified based on the input and output data of the step response of the closed-loop system, the parameters of the feedback controller and the delay constant of the system , and the identified controlled object is a continuous system, which can effectively avoid the operation of open-loop identification or close-loop identification to obtain a discrete system; the continuous system based on the first-order inertia plus pure delay obtained from the identification can be directly applied to the system dynamic characteristics Analyzing and optimizing the control strategy to achieve better control of the controlled object has a very practical industrial application prospect in the implementation of advanced control methods.

Description

technical field [0001] The invention belongs to the technical field of process control, and in particular relates to a control method of a process control system. Background technique [0002] System identification is a necessary part of control system design and optimization, and it is also the basis for implementing advanced control methods and control method improvements. [0003] At present, the identification methods with relatively mature technology mainly have two directions: the open-loop identification method based on the excitation of the open-loop system and the closed-loop identification method for the discrete system. The former needs to change the operation method of the closed-loop system. In typical process industrial systems such as chemical industry and thermal power, considering the safety of the system and the stability and safety of the production process, and avoiding unnecessary cost increases, the open-loop identification method is generally not used....

AI Technical Summary

Problems solved by technology

[0004] The invention provides a control method of a process control system, which is used to solve the problem that the improper identification of the model caused by the prior art inevitably makes the control strategy designed based on the identified model unsatisfactory.

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