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PID control dead zone adjusting method based on programmable logic controller

A technology for controlling dead zone and adjusting method, applied in the field of PID control, can solve the problems of difficulty in ensuring stable production operation and stop transmission, reduce the work of modifying the set value and the risk caused by misoperation, reduce stoppage, Guarantee the effect of stable production operation

Pending Publication Date: 2021-12-31
PIPECHINA SOUTH CHINA CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a PID control dead zone adjustment method based on a programmable logic controller, so as to solve the work of manual offline modification of PID parameter values ​​in the above-mentioned background technology, which may easily cause unnecessary stoppage of transmission and make it difficult to ensure production operation smooth problem

Method used

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  • PID control dead zone adjusting method based on programmable logic controller
  • PID control dead zone adjusting method based on programmable logic controller

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] S1: On the basis of the minimum opening degree obtained by the on-off test of the electric control valve on site, the on-off test of the electric control valve is carried out on site, and the minimum value of the instantaneous flow change under the standard condition (F_DEV_MIN) and the minimum opening degree are correspondingly obtained when the minimum opening degree changes. The setting range is 1.5%;

[0032] S2: The initial value of the valve position opening is FW1. At the moment when the PLC program is initially running, the valve position opening value FW is assigned to FW1, and the instantaneous flow rate F under standard conditions is assigned to F1;

[0033] S3: Judging whether the valve is at the minimum opening according to the instantaneous flow change value under the standard condition, using the valve opening value FW-FW1 at the current moment, the difference is not within the set 1.5% range, and the current is not at the minimum opening. The instantaneo...

Embodiment 2

[0035] S1: On the basis of the minimum opening degree obtained by the on-off test of the electric control valve on site, the on-off test of the electric control valve is carried out on site, and the minimum value of the instantaneous flow change under the standard condition (F_DEV_MIN) and the minimum opening degree are correspondingly obtained when the minimum opening degree changes. The setting range is 2%;

[0036] S2: The initial value of the valve position opening is FW1. At the moment when the PLC program is initially running, the valve position opening value FW is assigned to FW1, and the instantaneous flow rate F under standard conditions is assigned to F1;

[0037] S3: Judging whether the valve is at the minimum opening according to the instantaneous flow change value under the standard condition, using the valve opening value FW-FW1 at the current moment, the difference is within the set 2% range, and the current is at the minimum opening. The instantaneous flow rate...

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Abstract

The invention discloses a PID control dead zone adjusting method based on a programmable logic controller. Required equipment comprises an upper computer, a PLC system, an electric actuating mechanism and an electric adjusting valve switch. According to the PID control dead zone adjusting method based on the programmable logic controller, the natural gas flow of a current branch transmission branch serves as an input parameter to be introduced into a calculation module, the calculated flow dead zone value is closely related to the current flow, and then the flow dead zone value is written into a station yard flow PID control program, and therefore, the purpose of automatically setting the flow PID dead zone value according to the transfer or distribution quantity is achieved, the work of manually modifying the PID parameter value off line is replaced, unnecessary transmission stopping is reduced, stable production operation can be effectively guaranteed; in the method, the adjustment of the flow dead zone completely depends on judgment of a PLC system, logic calculation is executed according to a preset sequence, and the work of modifying the set value by personnel and the risk caused by misoperation are reduced.

Description

technical field [0001] The invention relates to the technical field of PID control, in particular to a PID control dead zone adjustment method based on a programmable logic controller. Background technique [0002] The distribution branch of the natural gas distribution station is equipped with a control valve driven by an electric actuator to control the distribution of natural gas downstream. In order to ensure the controllability of the distribution, the control valve adopts the PID control mode. According to the different controlled quantities, it can be divided into pressure PID and flow PID. [0003] PID control system is composed of proportional unit, integral unit and differential unit. its input with output The relationship is: [0004] [0005] So its transfer function is: ,in is the proportional coefficient; is the integral time constant, is the differential time constant. In order to reduce vibration, a certain amount of dead zone can be set fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B11/42
CPCG05B11/42Y02P90/02
Inventor 张平彭太翀王多才刘继银黄义辉管文涌杨阔
Owner PIPECHINA SOUTH CHINA CO