A control method for a process control system

A technology of a process control system and a control method, applied in the control field of the process control system, can solve the problems of the control strategy not meeting the requirements and the improper model identification, etc.

Active Publication Date: 2021-07-09
ZHENGZHOU UNIV +1
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  • Abstract
  • Description
  • Claims
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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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  • A control method for a process control system
  • A control method for a process control system
  • A control method for a process control system

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Embodiment Construction

[0033] The present invention considers the stability, economy and safety of the industrial process, and adopts the data obtained from the relevant input and output based on the step signal of the set value to perform closed-loop identification. In process control, most systems can be described by the transfer function system of first-order inertia plus pure delay. The delay time constant can be easily obtained from the input and output data of the closed-loop system. This parameter can be used directly without However, the parameters of the first-order inertia link need to be identified through the input and output data of the closed-loop system.

[0034] Therefore, the control method of the present invention is implemented on the basis of a closed-loop identification method of first-order inertia plus pure delay link based on step response and considering feedforward. The identification method is based on the input and output data of the step response of the closed-loop syste...

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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....

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/042
CPCG05B19/0423G05B2219/25257
Inventor 吴振龙刘艳红孙立明霍本岩李方圆杨磊
Owner ZHENGZHOU UNIV
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