Double-tank cascade liquid level system based on piping and instrument diagram (PID) controller and control method thereof

Abstract

The invention discloses a double-tank cascade liquid level system based on a piping and instrument diagram (PID) controller. The double-tank cascade liquid level system based on the PID controller mainly comprises a water storage tank (1), a lower water tank (2) which is arranged above the water storage tank (1), an upper water tank (3) which is arranged above the lower water tank (2). The water storage tank (1), the lower water tank (2) and the upper water tank (3) is communicated with one another. A motor-driven control valve (4) is also comprised. The water storage tank (1) and the above water tank (3) are both connected with the motor-driven control valve (4) through water pipes. Control devices are arranged on motor-driven control valve (4) and the water pipes between the lower water tank (2) and the upper water tank (3). The invention also discloses a control method of the double-tank cascade liquid level system based on the PID controller. The double-tank cascade liquid level system based on the PID controller and the control method of the double-tank cascade liquid level system based on the PID controller not only achieves a good control effect, but also is lower in control cost, good in control effect and high in practical value. And when a perturbance occurs, a minor loop where a middle water tank is located can response quickly to eliminate effect of the perturbance. Ideal control effect is achieved.

Description

technical field [0001] The invention relates to a dual-capacity cascaded liquid level system based on a PID controller and a control method thereof. Background technique [0002] Liquid level is one of the control parameters often encountered in industrial process production. Accurate liquid level control of the required control object is related to the quality of the product and is an important issue to ensure the production effect and safety. Therefore, the control of the liquid level has important practical significance and broad application prospects. [0003] Control theory has gone through two stages of development, classical control theory and modern control theory, and now it has entered the development period of nonlinear intelligent control theory. In terms of the problems solved by control theory, many major and fundamental problems, such as controllability, observability, stability, etc., have established a relatively complete theoretical system in traditional c...

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Problems solved by technology

The second problem is the controllability of the system

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