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Control method for four-holding water tank system

A four-capacity water tank and control method technology, which is applied in the direction of liquid level control, non-electric variable control, control/regulation system, etc., can solve the problems that the control effect is not obvious, the influence of liquid level is not considered, and achieve continuous and discrete control Comprehensive best effect

Inactive Publication Date: 2015-07-01
CHANGSHU RES INSTITUE OF NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The existing technology only adjusts according to the error between the actual liquid level value and the set value, and does not take into account the impact of discrete events on the liquid level.
After using the PID controller to adjust, the control effect is not obvious, and the electric control valve needs a period of time to reach the control effect value, which has a certain delay, and the liquid level has a great shock

Method used

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  • Control method for four-holding water tank system
  • Control method for four-holding water tank system
  • Control method for four-holding water tank system

Examples

Experimental program
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Effect test

Embodiment

[0022] The four-capacity water tank system consists of four water tanks, liquid level detection devices, water pumps, reservoirs, electric control valves and frequency converters, including continuous variables and discrete variables, and the variables affect each other. Each water tank is equipped with a detection liquid The water pump is used to supply water to the water tank. The electric adjustment electric control valve adjusts the water flow of the control circuit by adjusting the valve opening. The frequency converter changes the water output of the pump by adjusting the frequency of the water pump. Two of the water tanks have output The outlet, the outlet water flows directly into the reservoir, and through adjustment, the reservoir provides water for the water tank; the maximum liquid level of each water tank is 30cm, and each water tank is equipped with an overflow pipe to prevent the water from overflowing, and the water level reaches the maximum value When it flows ...

Embodiment 2

[0088] The present invention adopts following method to carry out:

[0089] (1) Segment the system process according to the physical law, qualitative knowledge, operating experience and state input and output constraints of the controlled object, and the continuous variable state system is modeled by differential equation or difference equation.

[0090] (2) Select binary logic variables for logic rules, expert experience, and operational constraints in the system , build simple or compound propositional logic and convert to the corresponding mixed linear inequalities.

[0091] (3) Add appropriate auxiliary variables to the continuous variable state equation of the system, transform the propositional logic describing the relationship between continuous variables and discrete variables of the system into the form of mixed integer inequalities, consider the initial constraints of the system and convert them into inequalities, The process and state of the entire system can be d...

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Abstract

The invention discloses a control method for a four-holding water tank system and belongs to the field of automatic control. A four-holding water tank is a typical hybrid system with constraint, and the mutation of the water tank structure and a switch of the a valve are discrete events. Continuous process and discrete events are integrated in a uniform framework through a modeling method for a mixed logic dynamic model, and the interaction between the discrete events and continuous dynamic process is described precisely; model predictive control for a four-holding hybrid system based on transverse 8 norm is designed, the field device control through MATLAB is finished through OPC communication, and the effect of a predictive control strategy in the MATLAB on an actual hybrid system is realized. The control method for the four-holding water tank system uses the modeling and control methods of hybrid system theory, and all the subsection models of the system are integrated to precisely describe the interaction between a model switch event and the continuous dynamic process; the predictive control based on the hybrid system model processes the control problem of the system with a lot of constraint conditions, and the continuous and discrete control for the system is optimal.

Description

technical field [0001] The invention belongs to the field of automatic control, and more specifically relates to a control method for a four-capacity water tank system. Background technique [0002] In the field of industrial control, some systems include not only continuous dynamic parts that obey the laws of physics, but also discrete event dynamic system parts that follow some complex artificial rules, such as airport traffic management systems, flexible production lines, large-scale communication networks, etc., system behavior It is mainly determined by discrete events rather than continuous variables, and the behavior evolves according to certain logic rules; there are a large number of devices and devices with discrete characteristics in some systems, such as PLC controllers, relays, contactors on / off, point switches, valves and more. These systems have one thing in common: that is, they contain continuous dynamic process and discrete logic state process, and the con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D9/12
Inventor 孙瑜张玲
Owner CHANGSHU RES INSTITUE OF NANJING UNIV OF SCI & TECH
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