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Method and device for determining model parameters to control modules of a steam power plant

A technology of model parameters and steam generators, which is applied in the direction of steam engine devices, steam generation, control systems, etc., which can solve the unavoidable, inaccurate estimated values ​​of boiler time constants stored in time constants, and the inability to rule out the decline of control quality over time, etc. problems to achieve high flexibility

Active Publication Date: 2016-08-03
SIEMENS ENERGY GLOBAL GMBH CO & KG
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Problems solved by technology

The disadvantage of this approach, however, is that the value of the storage time constant must always also be specified in advance
The overhead for measuring and storing the time constant cannot thus be avoided
In addition, the inaccuracy of the stored time constant directly contributes to the inaccuracy of the estimate of the boiler time constant
A decrease in control quality over time cannot therefore still be ruled out
Another disadvantage of this method is that the fuel mass flow (Brennstoffmassenstrom) is considered as an input parameter of the system whose dynamics can be determined

Method used

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  • Method and device for determining model parameters to control modules of a steam power plant
  • Method and device for determining model parameters to control modules of a steam power plant
  • Method and device for determining model parameters to control modules of a steam power plant

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Embodiment Construction

[0023] Figure 1 is used to clarify the dynamic process of steam generation and explain two model parameters: boiler time constant TDE and storage time constant TSP.

[0024] exist Figure 1A A block diagram of the steam generator is shown in simplified form in . The combustion chamber of boiler K is supplied with fuel BR at its inlet, wherein the fuel can be, for example, coal pulverized into pulverized coal in a coal pulverizer. Fuel can be measured here material flow. The corresponding thermal power of the fuel Corresponds to the material flow corrected for the heating value HW of the fuel. Fuel is burned inside the boiler K. In order to generate steam, the feed water conveyed in the pipes in the walls of the steam generator is heated and evaporated. through the superheater The piping system delivers this steam to the turbine valve TV. steam generation DE ges The overall process is ideally divided into two partial processes: the actual steam generation DE and the ...

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Abstract

The invention relates to a method and a corresponding device for determining at least one model parameter of a control technology model of a steam generator, wherein a control technology model structure having at least one characteristic model parameter is provided for the steam generator. . Measurement signals of the steam generation process are collected online. According to the invention, at least one model parameter is estimated online. For this purpose, the same input signals are fed to the real process and to the model of the steam generator. An estimability analysis is then carried out, in which at least one output signal and / or at least one input signal of the respective process and / or model is processed by evaluation by comparison using a gradient analysis. An estimation range within which valid parameter estimates are possible is defined in a further step based on gradient analysis. If the estimability is assessed as positive, the current estimated value of at least one model parameter is improved and the model is also adapted using said estimated value according to an iterative method. The invention also relates to a control device for a steam generator and a computer program product.

Description

technical field [0001] The invention relates to a method for determining model parameters for controlling a steam power plant module and a corresponding arrangement according to the preamble of claim 1 . The invention also relates to a control device for a steam generator and to a computer program product. Background technique [0002] A model-assisted approach is used in the control of the steam power plant module. Based on the model used, the time variation of the setpoint values, in particular for boiler power and turbine power, is always calculated in such a way that the power plant modules have the best possible operating characteristics in the various operating modes. The additionally present correction controller compensates for possible model inaccuracies. [0003] The determination of the model parameters is associated with high costs. Furthermore, power plant modules change their temporal characteristics over time due to contamination, wear, fuel changes, and th...

Claims

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Application Information

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IPC IPC(8): G05B13/04F22B35/18F01K3/22
CPCF22B35/18F01K3/22G05B17/02
Inventor K.温德伯格
Owner SIEMENS ENERGY GLOBAL GMBH CO & KG
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