Liquid level control method of dual-loop water tank based on model prediction

A technology of model prediction and liquid level control, which is applied in the direction of liquid level control, adaptive control, general control system, etc. It can solve the problems of difficult physical modeling parameters and not a modeling method of the double circuit water tank liquid level system

Inactive Publication Date: 2015-05-13
CENT SOUTH UNIV
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Problems solved by technology

In the ever-changing actual industrial process, it is also difficult to obtain the physical modeling parameters of the double-circuit water tank liquid level system, which is not a widely applicable and general modeling method

Method used

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  • Liquid level control method of dual-loop water tank based on model prediction
  • Liquid level control method of dual-loop water tank based on model prediction
  • Liquid level control method of dual-loop water tank based on model prediction

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Embodiment Construction

[0019] The connection block diagram of the double circuit water tank liquid level system of the present invention is as follows figure 1 As shown, the double-circuit water tank liquid level system is a double-circuit continuous water supply system composed of three water tanks. Among them: the water in the first water tank 1 is pumped out by the water pump 4, and injected into the third water tank 3 and the second water tank 2 through the electric control valves 5 and 6 respectively; the water in the third water tank 3 and the second water tank 2 is respectively passed through the manual valve 7 , 8 leaked to the second water tank 2 and the first water tank 1; the opening of the electric control valve 5 and the valve 6 are used to control the water intake intensity; the liquid level sensors 9 and 10 are used to detect the third water tank 3 and the second water tank 2 respectively liquid level in .

[0020] The control method of the present invention is as figure 2 As shown...

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Abstract

The invention discloses a liquid level control method of a dual-loop water tank based on model prediction; the method comprises the steps: performing off-line recognition to the liquid level system of the water tank according to the openness of an input valve of the liquid level system of the dual-loop water tank and the historical data of the output liquid level, and establishing an overall non-linear mathematic model of the system depending on a liquid level non-linear auto-regression (ARX) model of the water tank; optimizing the parameters of the non-linear ARX model and confirming the order of the non-linear ARX model by utilizing an AIC (Akaike Information Capacity) criteria; designing a non-linear predication control algorithm by means of a standard quadratic performance index, obtained by the off-line recognition, based on the overall non-linear mathematic model depending on the liquid level non-linear ARX model of the water tank; acquiring a prediction controlled quantity v at each sampling moment by means of the global non-linear characteristic depending on the liquid level non-linear ARX model of the water tank; and realizing the liquid level control performance index by setting the parameters of a predication controller. With the combination of a system recognition technique and an automatic control technique, the method is a modeling and prediction control method with wide applicability for the liquid level system of the dual-loop water tank.

Description

technical field [0001] The invention relates to the technical field of automatic control, in particular to a method for controlling the liquid level of a double-circuit water tank based on model prediction. Background technique [0002] The dual-loop water tank liquid level control system is an important controlled object in the industrial production process. It has typical characteristics of nonlinearity, strong coupling, time delay, etc., and plays an important role in the industrial production process. Its control effect is not only related to the quality of products, but also an important issue related to production efficiency and safety. Therefore, the precise control of the liquid level of the double-circuit water tank has important practical significance and broad application prospects. [0003] The classic PID controller is a commonly used dual-loop water tank liquid level control method. This method has the advantages of simple control principle and easy implementa...

Claims

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Application Information

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IPC IPC(8): G05D9/12G05B13/04
Inventor 彭辉周锋覃业梅顾云峰
Owner CENT SOUTH UNIV
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