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Method and device for the identification of a delay-susceptible control path, control device, and computer program product

A technology of adjusting objects and delay units, applied in computer control, program control, control/regulating systems, etc., can solve the problems of inaccuracy and limitation of the adjustment quality model, and achieve the effect of reducing energy consumption and high adjustment quality

Inactive Publication Date: 2009-09-09
SIEMENS AG
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Problems solved by technology

Here, the adjustment quality is always limited due to model inaccuracies

Method used

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  • Method and device for the identification of a delay-susceptible control path, control device, and computer program product
  • Method and device for the identification of a delay-susceptible control path, control device, and computer program product
  • Method and device for the identification of a delay-susceptible control path, control device, and computer program product

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Embodiment Construction

[0015] with the help of figure 1 Structural model RS illustrating the regulation technology of the steam generator. The time-varying parameters and functional relationships are illustrated by suitable graphic symbols and linked into a structure diagram.

[0016] The fuel mass flow mBr is supplied as an input variable to the steam generator represented in the figure by the control object RS. To generate steam, for example, pulverized coal is burned in a coal crusher, whereby the feed water introduced into the pipeline above the burner is heated to steam. The different calorific values ​​of the coal are taken into account in the structural model RS via the scaling unit HW. Furthermore, each combustion and thus steam generation has different efficiencies, such as figure 1 denoted as a single block η in . These factors, which mainly relate to the coal quality, are taken into account from the control technology as factors for multiplying the input parameter of the combustion ma...

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Abstract

The invention relates to a method for identifying a delay-susceptible control path in the control of a steam generator, and a device constructed for carrying out the method. A model structure of the steam generator is specified, consisting of an unknown time-variable Nth-order delay element and a known integrator. Also used for the identification are measurements of the fuel mass flow, the turbine steam mass flow, and the live steam pressure which arises in the steam accumulator behind the steam generator after the removal of the turbine steam mass flow. Using these online measurements and the model structure, the live steam mass flow at the output of the steam generator is derived by calculation. In this way, the input value and the output value of the Nth-order delay element (VZN) are determined in such a way that, using an estimation method, the parameters of a continuous transmission function of the Nth-order delay element (VZN) are also determined online. The estimated parameters are then converted into the time constants of a delay element with N independent time constants. In a following step, the relevant time constant for the delay element of the specified model structure is determined by comparison of the N independent time constants.

Description

technical field [0001] The invention relates to a method for detecting time-delayed control objects in the control of a steam generator and to a device designed for carrying out the method. Furthermore, the invention relates to a regulating device and a computer program product. Background technique [0002] The control quality of model-based control depends on how well the dynamics of the actual process are represented by the model. In the case of steam generators with turbines in coal-fired power plants, the dynamics of the overall system are due to the non-linear properties of the different units such as coal crushers, fans, suction devices, etc. and especially due to the raw material quality of the coal fluctuate over time. Furthermore, process dynamics change over time as a result of contamination and wear. [0003] In order to regulate these time-varying processes, until now usually only the dynamics of the process have been considered as follows: Starting from a ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/00G05B13/04
CPCG05B19/00G05B23/0202G05B17/02
Inventor 卢茨·奥根斯坦伯恩德·拉姆伯恩德-马库斯·法伊弗克劳斯-沃尔特·温德尔伯格
Owner SIEMENS AG
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