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Method for controlling liquid level of four-hold water tank based on phase plane method

A technology of liquid level control and four-capacity water tanks, which is applied in the direction of liquid level control, adaptive control, general control system, etc., and can solve the problem of high model dependence

Inactive Publication Date: 2012-09-12
JIANGNAN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The conventional decoupling idea requires decoupling control of the water tank on the basis of accurate modeling, or adopts model-based multivariable predictive control. Their common defect is that they are highly dependent on the model.

Method used

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  • Method for controlling liquid level of four-hold water tank based on phase plane method
  • Method for controlling liquid level of four-hold water tank based on phase plane method
  • Method for controlling liquid level of four-hold water tank based on phase plane method

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Embodiment Construction

[0020] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0021] figure 1 Among them, "out1" to "out4" are four water outlets with adjustable pipe diameters. image 3 Middle V Pi (i=1, 2) is the voltage value output from the controller to the water pump. The liquid level in tank 2 is L 2 , the liquid level of tank 4 is L 4 . They are the liquid level setting values ​​of tank 2 and tank 4 respectively. The liquid level of the upper water tank 1 is L 1 , the liquid level of tank 3 is L 3 . K 2i (i=0, 1±, 2±, 3±, 4±) means L 2 Nine open-loop gains of the loop controller, K 4i (i=0, 1±, 2±, 3±, 4±) means L 4 Nine open-loop gains for the loop controller.

[0022] Step 1: First find out two pairs of input and output combinations with relatively small coupling, and then use two controllers to control them separately. The following steps use one of the controllers as an example.

[0023] St...

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Abstract

The invention provides a method for controlling the liquid level of a four-hold water tank based on phase plane method. The invention has the main characteristics that the liquid levels of two water tanks which are positioned at the lower layer are respectively controlled by adopting two independent controllers. A phase plane partition control method is used as a control strategy. The method provided by the invention can directly calculate controlled quantity adapted to current ERROR and CHANGE IN ERROR according to the current ERROR and CHANGE IN ERROR without modeling for a system, has a stronger anti-interference performance and is suitable for controlling a coupling system. Aiming at the problem of time lag of a multi-hold water tank, the overshoot caused by the time lag can be restrained through adding the derivation feedback; and by organically combining the time lag and the derivation feedback, finally, a set value can be quickly and stably tracked by the liquid level.

Description

technical field [0001] The invention relates to a method for controlling the liquid level of a four-capacity water tank, which belongs to the field of intelligent control. Background technique [0002] The various units of the chemical process are closely connected and often exhibit complex dynamic characteristics. In actual production, many industrial objects often need to control multiple variables at the same time. Many controlled objects (such as industrial boilers and crystallizer liquid level control) can be abstracted into mathematical models of four-capacity water tanks. Therefore, the liquid level control of four-capacity water tanks is studied. It is of great reference value to the actual industrial process control. [0003] The four-capacity water tank consists of two sets of independent double-capacity water tanks. It has the following characteristics. [0004] (1) The pipe diameter of the inlet and outlet of the water tank can be easily replaced, and time-var...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D9/00G05B13/04
Inventor 潘丰李艳坡于春海张相胜
Owner JIANGNAN UNIV
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