Design method for IMC-PID (Internal Mode Control-Proportion Integration Differentiation) controller of non-square time delay system

A non-square time-delay and design method technology, applied to controllers with specific characteristics, electric controllers, etc., can solve problems such as difficult to guarantee the dynamic performance and robustness of controllers

Inactive Publication Date: 2013-01-23
BEIJING UNIV OF CHEM TECH
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Problems solved by technology

[0055] In order to solve the problem that the traditional internal model control method is difficult to guarantee the dynamic performance and robustness of the controller when dealing with non-square time-delay systems

Method used

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  • Design method for IMC-PID (Internal Mode Control-Proportion Integration Differentiation) controller of non-square time delay system
  • Design method for IMC-PID (Internal Mode Control-Proportion Integration Differentiation) controller of non-square time delay system
  • Design method for IMC-PID (Internal Mode Control-Proportion Integration Differentiation) controller of non-square time delay system

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Embodiment Construction

[0092] Taking a Shell standard control problem proposed by Shell Petroleum Company of the United States as an example to illustrate the specific implementation steps of this method

[0093] A multi-variable controlled process is established based on the heavy oil fractionation tower in the fluid catalytic cracking unit. The structure diagram of the heavy oil fractionation tower is as follows Figure 8 As shown, in the Shell standard control problem, there are no obvious constraints and control requirements for some output quantities, and the Shell problem is simplified as a system with three inputs and two outputs.

[0094] G p (s) is the transfer function matrix of an m×n process with n inputs and m outputs, that is, a 2×3 matrix, and the transfer function g of each channel ij (s) for G p (s) The transfer function between the j-th input channel and the i-th output channel, K, θ,, τ are the transfer functions g ij (s) gain, lag time and time constant, g ij The form of (s)...

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Abstract

The invention provides a design method for an IMC-PID (Internal Mode Control-Proportion Integration Differentiation) controller of a non-square time delay system, and relates to the field of industrial process control. The design method comprises the following steps of: converting the control problem of the non-square system into the control of a series of independent loops due to the thinking of effective open-loop transfer functions, and designing the IMC-PID controller capable of being used for the actual field in combination with a design method of an inner die controller and a numerical search algorithm. The design method has the advantages that (1) an equivalent model is used, so that the complex computation such as first decoupling and second designing can be avoided; (2) the parameter values of the PID of the non-square system can be directly searched by the search algorithm, so that the design method is simple in computation process; (3) the input/output at two ends of the controller is sampled due to a non-square multi-given data acquisition method; and (4) the novel incremental IMC-PID controller in the form of incomplete differential PID is adopted, so that the calculated quantity of full quantity accumulation can be observably reduced, and the adaptability of the anti-interference performance and the actual working condition can be improved.

Description

technical field [0001] The invention relates to a control method for a non-square time-delay system in the field of industrial process control. Background technique [0002] The Shell standard control problem is based on the heavy oil fractionation tower in the fluid catalytic cracking unit to establish a multivariable controlled process model. The heavy oil fractionation tower has three product outlets and three side loop reflux loops, and the gaseous superheated steam flow brought in by the feed provides heat for the fractionation tower. The heavy oil fractionation tower achieves the desired separation of products through the reverse flow of the unbalanced vapor-liquid two-phase in the tower, and conducts heat and mass transfer in multiple intimate contacts. It is a non-square model. Due to the special structure of the non-square system, most of the control methods suitable for the non-square system cannot be directly applied to the control of the non-square system. A co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B11/42
Inventor 靳其兵郝俸
Owner BEIJING UNIV OF CHEM TECH
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