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Air conditioning system model identification method based on bias relay feedback

A technology for air-conditioning system and model identification, applied in control/regulation systems, general control systems, instruments, etc., can solve the problems of long test time and inability to effectively identify the model of the controlled object.

Inactive Publication Date: 2015-09-30
SHANGHAI JIANKUN INFORMATION TECH +1
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Problems solved by technology

However, the conventional relay feedback experiment cannot effectively identify the model of the controlled object, and often requires an open-loop step experiment, and needs to measure the static gain of the object in advance, which has the disadvantage of long test time

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  • Air conditioning system model identification method based on bias relay feedback
  • Air conditioning system model identification method based on bias relay feedback
  • Air conditioning system model identification method based on bias relay feedback

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Embodiment Construction

[0037] The embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings, but the present embodiments are not intended to limit the present invention. All similar structures and similar changes of the present invention should be included in the scope of protection of the present invention. The commas in all indicate the relationship between and.

[0038] like Figure 1-Figure 2 As shown, an air-conditioning system model identification method based on bias relay feedback provided by an embodiment of the present invention relates to an air-conditioning system equipped with a PID controller. The specific steps of the method are as follows:

[0039] 1) Implement the bias relay feedback experiment, the experimental method is:

[0040] Firstly, when the air conditioning system is in the closed-loop normal operation state, switch the PID controller in the control loop of the air conditioning system to a bias relay with hyste...

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Abstract

The invention relates to an air conditioning system model identification method based on bias relay feedback, relates to the technical field of air conditioning control and solves the technical problem to shorten the test time. According to the method, when an air conditioning system is in a closed loop mode normal operation state, a PID (proportion integration differentiation) controller in an air conditioner system control loop is switched into a bias relay with a hysteresis loop, so that the air conditioner system is converted into a nonlinear closed loop system; then, the bias relay feedback experiment is implemented; next, the critical frequency characteristics of a controlled object are obtained according to the limit loop characteristic data generated in the bias relay feedback experiment process; a first-order plus dead-time model of the controlled object is obtained according to the critical frequency characteristics of the controlled object. The method provided by the invention is applicable to the air conditioner system model identification.

Description

technical field [0001] The invention relates to air-conditioning control technology, in particular to a technology of an air-conditioning system model identification method based on bias relay feedback. Background technique [0002] Many control algorithms of air conditioning systems are established based on system models, such as predictive control algorithms, internal model control algorithms, etc. Therefore, accurate system models are very important for control algorithms. [0003] The relay feedback method is a commonly used air-conditioning system model identification method. The essence of this method is to construct a nonlinear closed-loop system to obtain the critical information of the control object. It not only provides a novel PID self-tuning control strategy, but also The most important thing is that the method can quickly obtain critical information of the system based on the relay test and reduce the test time. However, the conventional relay feedback experim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
Inventor 李建周慎陈烈
Owner SHANGHAI JIANKUN INFORMATION TECH
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