CompactLogix-based fuzzy self-tuning PID liquid level control method

A technology of liquid level control and fuzzy controller, which is applied in the direction of liquid level control, non-electric variable control, control/regulation system, etc. It can solve the problems of difficult setting of control parameters, low efficiency, and difficulty in achieving the best control effect. Good control effect, improve efficiency and save calculation time

Inactive Publication Date: 2017-05-10
XIAN UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a liquid level control method based on CompactLogix-based fuzzy self-tuning PID, which solves the problems of difficult setting of conventional PID control parameters, low efficiency and difficulty in achieving the best control effect

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  • CompactLogix-based fuzzy self-tuning PID liquid level control method
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  • CompactLogix-based fuzzy self-tuning PID liquid level control method

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Embodiment Construction

[0046] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0047] The present invention is a liquid level control method based on CompactLogix-based fuzzy self-tuning PID, the control structure is as follows figure 1 As shown, the actual liquid level signal y is sampled, filtered, adjusted and quantized, and then the set liquid level signal y is calculated d The deviation e and the deviation change rate ec between the actual liquid level signal y; take e and ec as the input variables of the fuzzy controller, and perform fuzzy, fuzzy reasoning, and clear processing on the input variables to obtain the output of the fuzzy controller ΔK p , ΔK i , ΔK d , combined with the initial reference value set by the conventional PID controller, the three parameters of the PID controller can be obtained, and finally the control signal is calculated by the PID regulator formula, and acts on the controlled object....

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Abstract

The invention discloses a CompactLogix-based fuzzy self-tuning PID liquid level control method which comprises the following steps: in step 1, actual liquid level signals y are subjected to sampling, filtering, tuning and quantifying operation; deviation e and a change rate ec of the deviation between the actual liquid level signals y and preset liquid level signals yd are calculated; in step 2, input quantities are subjected to fuzzification, fuzzy reasoning and deblurring operation; output quantities [delta]Kp, [delta]Ki and [delta]Kd of a fuzzy controller can be obtained finally; in step 3, based on an initial benchmark value set in a conventional PID controller, three parameters of a PID controller is obtained, and control output is calculated and is applied to an object being controlled. Via the control method, a problem that the conventional PID control parameter setting is high in difficulty and low in efficiency and difficult in realization of optimal control effects can be solved.

Description

technical field [0001] The invention belongs to the technical field of automatic control and automatic adjustment, and in particular relates to a liquid level control method based on a CompactLogix-based fuzzy self-tuning PID. Background technique [0002] Liquid level control technology has an irreplaceable position in the field of automatic control and automatic adjustment systems, involving oil refining, power generation, chemical industry, metallurgy, medicine, papermaking and light industry and other industrial sectors, and plays a very important role in the development of the national economy. For example, the water level control of the steam drum of the boiler, once the liquid level is too low, the temperature of the boiler will be too high and a safety accident will occur; will have a huge impact. In short, in order to ensure the safety and stability of production, it is necessary to continuously develop advanced liquid level control technology and control strategy....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D9/12
CPCG05D9/12
Inventor 弋英民沈乾坤
Owner XIAN UNIV OF TECH
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