Valve position cascade control method based on fuzzy neural network PID controller

Abstract

The invention relates to a valve position cascade control method based on a fuzzy neural network PID controller, and belongs to the field of automatic control. According to the method, a valve position cascade control model comprising a regulating valve position control loop and a proportional valve downstream pressure control loop is established, the regulating valve position control loop is a main loop, and the valve position of a regulating valve is used as a main loop control object; the proportional valve downstream pressure control loop is used as an auxiliary loop, and the downstream pressure of a proportional valve is used as an auxiliary loop control object; the valve position cascade control model takes the valve position of the regulating valve as a control target, and a fuzzy neural network PID algorithm is adopted in the regulating valve position control loop. The problem that a traditional PID control method is poor in control effect and external disturbance can be hardlyeliminated by single-loop control due to the fact that the valve position control process is complex and changeable and a precise mathematical model is difficult to establish is solved, the valve position control process can be dynamically controlled in real time, the rapidity, accuracy and robustness of the control process are improved, and stable and continuous work of the regulating valve is facilitated.

Description

technical field [0001] The invention relates to the field of industrial automatic control, in particular to a valve position cascade control method based on a fuzzy neural network PID controller. Background technique [0002] The regulating valve, also known as the flow valve, is a device that uses power operation to change the flow of the medium in the process control system. It affects the adjustment quality of process control to a certain extent. In the industrial production system, the adjustment of environmental factors such as temperature, pressure, liquid level, concentration and other environmental factors that are closely related to product quality need to be adjusted through the opening control of the control valve. Whether the valve position meets the production requirements is directly related to whether the entire production system can run efficiently and safely. [0003] With the development of society and economy, industrial control systems have higher and hi...

AI Technical Summary

Problems solved by technology

[0011] Aiming at the deficiencies of the prior art, the present invention provides a valve position cascade control method based on a fuzzy neural network PID controller. The control effect is not good and the single loop control is difficult to eliminate the problem of external disturbance

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