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Linear control method for electric heater by DCS

A technology of electric heater and linear control, applied in electric controllers, controllers with specific characteristics, etc., can solve problems such as difficult to achieve expected control effect, large time lag of electric heaters, etc., to solve the problem of time lag , Reliable control and reliable adjustment

Pending Publication Date: 2020-09-01
杭州青云新材料股份有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention mainly solves the problem that the control of the electric heater in the prior art has a large time lag, and it is difficult to achieve the expected control effect; it provides a linear control method for the electric heater by the DCS, and linearly controls the electric heater to solve the large Control Effects Due to Time Lag

Method used

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  • Linear control method for electric heater by DCS
  • Linear control method for electric heater by DCS
  • Linear control method for electric heater by DCS

Examples

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Effect test

Embodiment

[0034] A DCS linear control method for electric heaters, such as figure 1 shown, including the following steps:

[0035] S1: The temperature sensor collects the temperature on site, and transmits the collected temperature information to the PID control module.

[0036] In this embodiment, the heating object of the electric heater is liquid. Liquids are mostly heated objects, and the models established by using liquids as objects are more universal.

[0037] S2: The PID control module outputs the manipulated variable MV after the PID control operation.

[0038] The manipulated variable MV is input to the FUNC-VAR function module as an input value, and the FUNC-VAR function module outputs a control quantity that is linear with the input after operation.

[0039] The operation function in the FUNC-VAR function module is a combination of at most seven segments of linear functions, and the linear function is f(x)=ax+b; wherein, a and b are constants.

[0040] The control funct...

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Abstract

The invention discloses a linear control method for an electric heater by a DCS, thereby solving a problem that in the prior art, control over an electric heater has large time lag, and an expected control effect is difficult to achieve. The method comprises the following steps that S1, a temperature sensor collects the temperature of a site and transmits the collected temperature information to aPID control module; S2, a PID control module outputs a manipulated variable MV after PID control operation; the manipulated variable MV serves as an input value to be input into an FUNC-VAR functionmodule; the FUNC-VAR function module outputs a control quantity which is linear with the input after operation; and S3, controlling the opening degree of the electric heater according to the control quantity output by the FUNC-VAR, and performing heating work. The FUNC-VAR function module is added after the PID link, so that the change rate of the PID operation variable MV adapts to the theoretical operation variable MV-electric heater opening curve change, the control has better linear control precision, the control is more reliable, and a time lag problem of the electric heater is solved.

Description

technical field [0001] The invention relates to the field of electric heater control, in particular to a DCS linear control method for the electric heater. Background technique [0002] An electric heater is the process of converting electrical energy into heat. It is a very common type of equipment in industrial production. Due to its characteristics of large time lag and nonlinearity, it is difficult to establish an accurate mathematical model. In actual production, it is often difficult to obtain the desired control effect by using the traditional PID control strategy. [0003] For example, a "PID control-based intelligent temperature control system design method for electric heating furnace" disclosed in the Chinese patent literature, its announcement number CN109634319A, includes the design of the PID controller: the control system uses an intelligent control algorithm, namely the PID control algorithm, The execution state of the actuator is controlled by the algorithm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B11/42
CPCG05B11/42
Inventor 高康
Owner 杭州青云新材料股份有限公司
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