Pneumatic control valve control method based on quantitative feedback theory

Abstract

The invention relates to a pneumatic control valve control method based on a quantitative feedback theory, and the method comprises the steps: building a mathematical model of a pneumatic control valve system, considering the uncertainty variation range of system model parameters under an actual working condition to obtain a controlled object template, and designing a robust stability index and a tracking performance index; converting model uncertainty, performance index requirements and the like of the pneumatic control valve system into control boundaries in a quantitative mode to obtain constraint conditions of a controller; and obtaining a feedback controller meeting the robustness requirement and a prefilter meeting the tracking performance index requirement by using a loop forming method according to the controller constraint condition. According to the method, the robustness of the pneumatic control valve system is improved by utilizing the known object model and the uncertainty information of the known object model, so that the control effect of the pneumatic control valve system meets the performance index requirements of the system when the model parameters change.

Description

technical field [0001] The invention relates to the technical field of automatic control, in particular to a control method of a pneumatic regulating valve based on quantitative feedback theory. Background technique [0002] Pneumatic control valve is an indispensable and important equipment in modern industrial process control system, and its performance will directly affect the entire industrial process. In the actual production process, pneumatic control valves often work in complex environments and are easily affected by external interference and internal equivalent interference (including model uncertainty, unmodeled dynamics, etc.). Therefore, the pneumatic control valve system The robust performance requirements of the controller are higher. [0003] At present, the control algorithms used in the pneumatic control valve system mainly include: conventional PID control method and improved control method based on PID. The improved control algorithm based on PID includes...

AI Technical Summary

Problems solved by technology

However, the method based on PID control has poor robustness and cannot better meet the performance index requirements of the system under external disturbance and model uncertainty, and the model dependence is strong

Although the improved control method based on PID can improve the robustness of the system, it cannot effectively use the known object model and its uncertain information.

Images