Control device and control method for gas-liquid dual-phase current pipe

Abstract

A control device and a control method for a gas-liquid dual-phase current pipe belong to the field of wireless control devices. The process is as follows: a microprocessor of a slave computer collects pressure data and flow data through an input-output port of a console; the collected data is transmitted to a principal computer, the principal computer processes the collected data, calculates the frequency output value of a frequency converter, and the principal computer transmits the frequency output value to the slave computer; the microprocessor of the slave computer writes the frequency output value into the frequency converter through the input-output port of the console; the frequency converter controls the rotation speed of an asynchronous motor through the written frequency; and the asynchronous motor regulates the output of a pump through the variation of the rotation speed, so as to control the flow speed and pressure of gas-liquid dual-phase currents in an incoming pipe. Thepresent invention adopts an improved active disturbance rejection controller, so that the control effects of a gas-liquid dual-phase current pipeline system are improved greatly, such as shorter regulating time, higher control precision, stronger interference rejection, higher robustness and the like.

Description

technical field [0001] The invention belongs to the field of wireless control devices, in particular to a gas-liquid two-phase flow pipeline control device and a control method. Background technique [0002] Gas-liquid two-phase flow refers to the flow phenomenon in which two flow media, gas phase and liquid phase, exist simultaneously in the same flow system. It is one of the most common types of multiphase flow phenomena. Gas-liquid two-phase flow can be divided into various types according to components, flow environment, flow state, etc. For example, according to the different material components, gas-liquid two-phase flow can be divided into single-component gas-liquid two-phase flow (the components of the gas-liquid two-phase flow are the same substance), such as water vapor-water two-phase flow (also known as gas-liquid two-phase flow two-phase flow) and two-component gas-liquid two-phase flow (the components of gas-liquid two-phase flow are two different substances,...

AI Technical Summary

Problems solved by technology

[0004] (1) There are great potential safety hazards, and the transmission line is prone to safety accidents such as electric shock and fire;

[0005] (2) The wiring cost is high and the decoration cost is high;

[0006] (3) The construction is complicated. Since the transmission line often passes through the wall or hangs on the wall, wiring is required during the construction of the building, and it is very inconvenient to add new communication points during the production process;

[0007] (4) Mobility and convenience are poor, and rewiring is required after the communication point is relocated or changed

[0010] The control target V can "jump" in the process, but the change of the output of the controlled object Y has inertia, and it is impossible to jump. It is required to let the slowly changing variable Y track the variable V that can jump, and the initial error is large. Easy to cause overshoot, very unreasonable

[0011] (2) There is no good way to generate the differential signal of the error

[0012] Since the differentiator is not physically realizable, it can only be realized approximately

[0013] (3) The introduction of error integral feedback has many negative effects

[0014] In PID control, the function of error integral feedback is to eliminate static error and improve the accuracy of system response, but at the same time, the introduction of error integral feedback makes the closed loop dull, easy to generate oscillation, and easy to cause saturation of control quantity caused by integral saturation

[0015] (4) Linear combination is not necessarily the best combination

Images