【Daily Question 20090319】How can the control quality of a control system be improved from the perspective of control instruments?
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How can the control quality of a control system be improved from the perspective of control instruments? Summary: 1. Calibration must be carried out strictly in accordance with the technical specifications of the control instrument. 2. Set the parameters of the control instruments reasonably. 3. For the general characteristics of the regulated object, a suitable control law should be selected. 4. For some special characteristics of the control objects, such as when there are large fluctuations in the load of generator sets and corresponding changes in the properties of those control objects, a parameter self-tuning regulator can be used ； If the process to be regulated is nonlinear, a nonlinear PID controller can be used ； The controlled object has a fast response to changes, and switch or PID dual-mode regulators can be used for control ； The object characteristics are time-varying control objects, for which an adaptive PID controller can be used. 5. For the follow-up control system, a setpoint regulator (abbreviated as SPC regulator) can be used; that is, it is necessary to modify the setpoint of the regulator at any time during the production process (which can be done using time-based programs or parameter programs) in order to improve the quality and quantity of the products. This post was last edited by Mobei Yihai on 2009-3-19 21:11]
Appropriate PID parameters can also be set using the self-tuning function built into the instrument itself, but this approach often doesn’t work very well
How can the control quality of a control system be improved from the perspective of control instruments? Does the regulating instrument mentioned by the poster refer to a regulator? Yesterday, we discussed the impact of transmitters on control quality. For a control system, it is necessary first to determine the control parameters and the characteristics of the parameter being controlled (such as whether there is any lag), as well as the characteristics of the transmitter and the control valve. Once these are known, the PID parameters of the controller can be set; by adjusting these PID parameters, the control quality of the system can be improved. If it is system-controlled, it can be configured to achieve this. If it is an intelligent programmable panel-mounted regulator, the adjustment parameters can be set on the regulator itself ； If a programmable fixed regulator is selected, the settings are programmed and fixed in the regulator module ； If it is a disc-type regulator, then it is necessary to decide whether to choose a dual-unadjusted regulator, a proportional regulator, an integral regulator, another integral regulator, a proportional-integral regulator, a proportional-differential regulator, an anti-differential regulator, or a proportional-integral-differential regulator.
1. Calibration must be carried out strictly in accordance with the technical specifications of the control instrument. 2. Set the parameters of the control instruments reasonably. 3. For the general characteristics of the regulated object, a suitable control law should be selected. 4. For some special characteristics of the control objects, such as when there are large fluctuations in the load of generator sets and corresponding changes in the properties of those control objects, a parameter self-tuning regulator can be used ； If the process to be regulated is nonlinear, a nonlinear PID controller can be used ； The controlled object has a fast response to changes, and switch or PID dual-mode regulators can be used for control ； The object characteristics are time-varying control objects, for which an adaptive PID controller can be used. 5. For the follow-up control system, a setpoint regulator (abbreviated as SPC regulator) can be used; that is, it is necessary to modify the setpoint of the regulator at any time during the production process (which can be done using time-based programs or parameter programs) in order to improve the quality and quantity of the products.
The correct answer is on the upper floor. Could you please provide a practical example for each type of regulator mentioned in point four, along with an explanation? Thank you!