Digital valve flow control system and optimal control method thereof

Abstract

The invention discloses a digital valve flow control system and an optimal control method thereof. The system comprises a signal input device for inputting a preset value, a v-shaped ball valve, a three-phase asynchronous motor for controlling the opening degree of the v-shaped ball valve, a valve position feedback device, a frequency converter for adjusting the rotation number and the rotation direction of the three-phase asynchronous motor, an amplifier, and a PLC. The three-phase asynchronous motor is electrically connected with the frequency converter, and the frequency converter is electrically connected with the amplifier, and the valve position feedback device, the amplifier and the signal input device are all electrically connected with the PLC. The optimal control method comprisesthe steps that a transfer function of the system is established, and a state equation of the control system is worked out by the transfer function, and an optimal solution is performed on the state equation to obtain an optimal control system. The invention is advantageous in that flow stability and interference resistance are good; the intelligent control is adopted to enable the accurate valveflow control device to have relatively good stability and energy-saving effect.

Description

technical field [0001] The invention relates to the technical field of valve control, in particular to a digital valve flow control system and an optimal control method thereof. Background technique [0002] With the development of technology, the application of valves in people's lives is becoming more and more frequent, and the requirements for valve flow control are getting higher and higher, and more and more requirements are required for precision and simplification. Among them, solenoid valves and electric valves are the main actuators for flow regulation. Since it is difficult to adjust the opening of solenoid valves, electric valves have become the preferred actuators for flow control. However, in the existing electric valve applications, the valve The opening change process is not a linear process. The existing electric valve can only realize the adjustment of the valve opening, but not the positioning of the valve opening, so it is also difficult to realize the ac...

AI Technical Summary

Problems solved by technology

Among them, solenoid valves and electric valves are the main actuators for flow regulation. Since it is difficult to adjust the opening of solenoid valves, electric valves have become the preferred actuators for flow control. However, in the existing electric valve applications, the valve The opening change process is not a linear process

The existing electric valve can only realize the adjustment of the valve opening, but cannot realize the positioning of the valve opening, so it is also difficult to realize the accurate control of the flow rate, especially the accurate estimation of the flow rate

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