Control object modeling method for energy-saving reconstruction of thermal power station

A modeling method and technology for controlling objects, applied in adaptive control, general control system, control/regulation system, etc., can solve the problems of low model accuracy, unsuitable for energy-saving retrofit applications, and inability to identify thermal process lag time, etc.

Inactive Publication Date: 2009-01-14
HARBIN INST OF TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Based on the problems of low model accuracy, inability to identify the lag time of the thermal process, the need for a complete step response, and not suitable for energy-saving retrofit applications in the current modeling method, a modeling method for the control object of thermal station energy-saving retrofit is proposed.

Method used

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  • Control object modeling method for energy-saving reconstruction of thermal power station
  • Control object modeling method for energy-saving reconstruction of thermal power station
  • Control object modeling method for energy-saving reconstruction of thermal power station

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Experimental program
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specific Embodiment approach 1

[0047] Specific implementation mode 1: The method for modeling the control object of the thermal station energy-saving renovation described in this implementation mode is realized according to the following steps:

[0048] Step 1. Obtain the response model of unit pulse signal, unit step signal and unit ramp signal:

[0049]The heat supply process is described by the second-order plus lag, and the model structure of the second-order plus lag object is G ( s ) = K ( T 1 s + 1 ) ( T 2 s + 1 ) e - τs ...

Embodiment approach

[0085] 1. Obtain slope, step, and impulse response curves:

[0086] Measure the response curve of the return water temperature to the step change of the valve opening, and obtain the slope, step and impulse response from this, see Figure 1~3 , Table 1 shows typical response values,

[0087] Table 1 Typical response values

[0088]

[0089] 2. Select the number of samples m, and write the difference equation:

[0090] Take A, B, C, and t in Table 1 to form a difference equation:

[0091] U = t ( 1 ) - 1 - A ( 1 ) - B ( ...

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Abstract

The invention relates to a control object modeling method, in particular to a control object modeling method for thermal station energy-saving reconstruction. The invention solves the problems of the existing modeling method that the model precision is low; the thermal process lag time can not be identified; complete step response is needed; and that application to energy-saving reconstruction can not be realized. The method of the invention mainly comprises the following steps of: acquiring response curves of unit pulse signals, unit step signals and unit slope signals; acquiring the identification equation from the typical transfer function; identifying unknown parameters of the object model after second-order lag process by using the least square method; acquiring difference equation of the heat supply object after discretization. The modeling method of the invention can supersede the conventional flying-up curve method to obtain high-precision models. Compared with the conventional flying-up curve method, the method of the invention can increase the modeling precision from 7 percent to within 3 percent and directly identify the lag time of the object instead of experimental determination in conventional methods.

Description

technical field [0001] The invention relates to a modeling method of a control object for heat supply energy-saving transformation. Background technique [0002] Existing modeling methods are not suitable for building heating and energy-saving retrofit applications: building heating energy consumption accounts for 27% of total social energy consumption in the Three-North region of my country. During the "Eleventh Five-Year Plan" period, heating energy saving is the focus. Currently, the operation and management of heating systems Most stay in manual and semi-automatic state. Starting from the purpose of energy saving, it is extremely important to improve the urban heating system and carry out heating energy-saving transformation. In the field of implementing energy-saving transformation, energy-saving and emission reduction, to design or transform the heating control system, it is first necessary to determine the mathematical model of the dynamic characteristics of the contr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
Inventor 齐维贵陈烈张永明邓盛川
Owner HARBIN INST OF TECH
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