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System and method for optimizing and adjusting controller parameters in distributed control system

A distributed system and controller technology, applied in electric controllers, controllers with specific characteristics, etc., can solve problems such as unreasonable settings and difficult PID parameter tuning, and achieve stable objects, strong anti-interference, and stable device control. Effect

Inactive Publication Date: 2012-03-28
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to provide a system and method for optimizing and setting controller parameters in a collection and distribution system, which can solve the problems of difficult and unreasonable setting of PID parameters in the prior art, optimize the control, and greatly improve the control effect. Improve product quality, save energy and reduce consumption

Method used

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  • System and method for optimizing and adjusting controller parameters in distributed control system
  • System and method for optimizing and adjusting controller parameters in distributed control system
  • System and method for optimizing and adjusting controller parameters in distributed control system

Examples

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Effect test

Embodiment 1

[0098] For example, LIC110 and LIC111, these two control loops are often manually controlled, resulting in poor electrical desalination effect and fluctuations in the liquid level at the bottom of the initial distillation tower.

[0099] LIC111 controls the water level settled in the north tank of electric desalination, and sends water to the south tank of electric desalination at the same time. The parameters of the PID controller of this loop: before optimization: KP=0.8; KI=1; KD=0, FT=0; after optimization: KP=0.59; KI=70; KD=0, FT=0; Figure 4 As shown, the first half of the picture shows the control trend before optimization. The valve position fluctuates from 0 to 95%. The fluctuation of the boundary position brings about the fluctuation of the liquid level at the bottom of the primary distillation tower, which affects the stability of crude oil feed and deteriorates the The effect of electric desalination. After parameter optimization, from Figure 4 In the middle an...

Embodiment 2

[0102] The heavy oil at the bottom of the atmospheric tower is pumped out by pump 103 in four ways to the decompression heating furnace, heated to 382°C and then combined in four ways, and then enters the decompression tower 104 through the oil transfer line. The decompression tower has 7 sections of packing. The oil vapor at the top of the tower is distilled from the top of the tower, condensed and cooled by the water cooler (110 / l-4), and the uncondensed gas enters the first-stage vacuum pump for vacuuming, and then enters the first-stage water cooler (cold 111 / 1.2.3) cooling, the non-condensed gas is evacuated by the secondary vacuum pump, enters the secondary water cooler (112) for cooling, and the non-condensable gas is discharged from the top of the cooling 112 to the heating furnace to be burned or discharged to the atmosphere. The furnace temperature and furnace outlet temperature of the decompression heating furnace are controlled in cascade, the furnace outlet tempera...

Embodiment 3

[0105] In petrochemical production, the control of the liquid level of the high-pressure separator is very important and critical. If the control is not good, the high pressure of the high pressure separator is connected to the low pressure separator in series, which is easy to cause an explosion. The high-pressure separator in a petrochemical refinery was connected to low pressure due to improper liquid level control, which caused the explosion of the device and caused a serious accident. Because this circuit is very critical, but this circuit is very difficult to control, the operators and craftsmen are helpless, so they have to operate it manually, and the operators have to pay attention to the liquid level at all times, which is very hard.

[0106] After adopting the optimal setting system and method of controller parameters in the collection and distribution system of the embodiment of the present invention, the liquid level of the high-pressure separator has been put int...

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Abstract

The invention discloses a system and method for optimizing and adjusting controller parameters in a distributed control system. The system comprises a data exchange interface module, an object dynamic test module, an object model identifying module, a model online simulation module and a PID parameter adjusting module, wherein the data exchange interface module is used for reading the measured data to obtain the process data of a controlled object and the measured characteristic parameter data, and transferring the process data to the object model identifying module, and transferring the measured characteristic parameter data to the online simulation module; the object dynamic test module is used for generating and adding the test signals to the controlled object; the object model identifying module is used for obtaining the model characteristic data of an object model of the controlled object by an identifying method; the model online simulation module is used for comparing the identified model characteristic data with the measured characteristic parameter data, and determining an object model; and the PID parameter adjusting module is used for adjusting the controller parametersby a controller parameter computing method, and selects a proper control mode. Through the invention, the control effect is remarkably improved, the product quality is improved, energy is saved and consumption is reduced.

Description

technical field [0001] The present invention relates to the technical field of parameter processing of a distributed control system (Distributed Control System, DCS) controller, in particular to the processing of PID (proportion integration differentiation proportional-integral-differential) parameters in the parameters of a distributed control system (Distributed Control System, DCS) controller A tuning system and method for optimal tuning of controller parameters in a collection and distribution system. Background technique [0002] DCS is the English abbreviation of Distributed Control System (Distributed Control System), also known as Distributed Control System in the domestic automatic control industry. The so-called distributed control system, or the distributed system in some materials, is a new type of computer control system relative to the centralized control system. It is developed and evolved on the basis of the centralized control system. here. It is a multi-l...

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
Owner BEIJING UNIV OF CHEM TECH
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