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A high-order system model reduction and pid control method based on frequency domain

A system model and control method technology, applied in the controller, electric controller, adaptive control and other directions with specific characteristics, can solve the problems of unsatisfactory closed-loop control effect and rough method, and achieve the effect of improving closed-loop control effect.

Active Publication Date: 2021-07-09
SOUTHEAST UNIV
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Problems solved by technology

[0012] The above-mentioned "engineering setting method" obtains the parameters of the PID controller through empirical formulas and tables. Although the application is simple, the method is too rough, and the final closed-loop control effect is not ideal.

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  • A high-order system model reduction and pid control method based on frequency domain
  • A high-order system model reduction and pid control method based on frequency domain
  • A high-order system model reduction and pid control method based on frequency domain

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Embodiment Construction

[0035] The technical solutions of the present invention will be further described below in conjunction with specific embodiments and drawings.

[0036] In this particular embodiment, a high-order system model reduction and PID control method based on the frequency domain, such as Figure 6 As shown, first, by a downgrade model The original high-order process is drawn into a second-order pure delay process, where K is a static gain, T 1 One time constant of the inertial part of the decline model, T 2 Another time constant of the inertial part of the lowering model, τ is a pure delay time constant; then based on the second-order pure delay process, the PID controller is designed to be used:

[0037]

[0038]

[0039] Where K C For the proportional factor in the PID control parameters, T d Differential coefficients in PID control parameters, T i Integral coefficients in PID control parameters, g PID (s) is the transfer function of the PID controller.

[0040] T 1 T 2 Get the foll...

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Abstract

The invention discloses a high-order system model reduction and PID control method based on the frequency domain. First, the original high-order process is reduced to a second-order pure delay process through the reduced-order model, and then PID is designed based on the second-order pure delay process. controller. The invention effectively improves the closed-loop control effect.

Description

Technical field [0001] The present invention relates to a high-order process downward process, in particular, to a high-order system model reduction and PID control method based on a frequency domain. Background technique [0002] At present, the control effect of the method common to the PID tuning for the high-order process during the thermal engineering process is not ideal, but the control effect of the PID tuning method for the low-order process is more ideal, so the high order can be The process is appropriately reduced to the low-order process, and then use the PID tuning method for the low-order process, the control effect should be improved. The traditional high-order process PID tuning method is the investigation form and critical proportional method in the engineering tuning method, and the method steps are as follows: [0003] 1. Book form: [0004] 1). According to Class N check [0005] 2). According to Value, check the table to get the parameter δ, T of the PID ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B11/42G05B13/04
CPCG05B11/42G05B13/042
Inventor 强筱婕孙立
Owner SOUTHEAST UNIV