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Whole-process steam turbine modeling and recognizing method of actual characteristics of parameters changing with working conditions

An identification method and steam turbine technology, applied in the direction of electric digital data processing, special data processing applications, instruments, etc., can solve problems such as difficult to simulate the output characteristics of steam turbine units, no mechanical turbine model, difficult to support power system stability research, etc.

Active Publication Date: 2017-05-17
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +4
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  • Claims
  • Application Information

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Problems solved by technology

[0008] However, neither of the above two inventions has a full-process turbine model, which is difficult to simulate the output characteristics of the steam turbine when large signal disturbances occur, and it is difficult to support the next step of power system stability research

Method used

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  • Whole-process steam turbine modeling and recognizing method of actual characteristics of parameters changing with working conditions
  • Whole-process steam turbine modeling and recognizing method of actual characteristics of parameters changing with working conditions
  • Whole-process steam turbine modeling and recognizing method of actual characteristics of parameters changing with working conditions

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Embodiment 1

[0114] The present invention provides a whole-process steam turbine system modeling and identification method that considers the characteristics of key parameters varying with operating conditions. The present invention will be further described below in conjunction with the accompanying drawings, including the following steps:

[0115] Step 1: Use the mechanism analysis method to establish a mathematical model of the whole process steam turbine considering the characteristics of key parameter random group operating conditions. The power model of the cylinder is obtained to obtain a complete steam turbine power output model. The influence of the change of operating conditions on key parameters is considered in the model, so as to obtain the whole process steam turbine model when key parameters change with operating conditions;

[0116] Step 2: Conduct on-site disturbance tests under typical working conditions, obtain test data on the influence of working condition changes on st...

Embodiment 2

[0208] According to a whole-process steam turbine modeling and identification method based on the variable parameter method provided by the present invention, a steam turbine in a power plant is used as the research object for verification. The relevant parameters of exhaust steam condensation type are shown in Table 1.

[0209] Table 1 embodiment steam turbine related parameters

[0210]

[0211] In the table: p 0 is the main steam pressure.

[0212] Establish the whole-process steam turbine model based on the variable parameter method with the method described in the manual; obtain the input and output data of the steam turbine system through field tests; Figure 4 The particle swarm optimization-steam turbine system identification model shown in the figure identifies undetermined parameters and identifies multiple working conditions to obtain the changing trend of key parameters with load. Taking KGV as an example, its changing characteristics with working conditions a...

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Abstract

The invention discloses a whole-process steam turbine modeling and recognizing method of actual characteristics of parameters changing with working conditions. The method mainly includes: 1), applying a mechanism analyzing method to build a whole-process steam turbine mathematical model in consideration of characteristics of parameters changing with unit running conditions; 2), putting forward an acquiring method of characteristics of key parameters changing with working conditions on the basis of an on-site experiment method; 3), putting forward a steam turbine system model parameter recognizing method based on a particle swarm algorithm-steam turbine system model. A solution is provided for the problem that a steam turbine model under the condition of dynamic stimulation great disturbance of a power system is difficult to reflect actual unit active power response characteristics, power output characteristics of a steam turbine under the condition of great disturbance in whole-process dynamic stimulation of the power system can be stimulated, analysis accuracy of the power system is improved, and safe and stable running of a power grid is guaranteed.

Description

technical field [0001] The invention relates to the technical field of steam turbine modeling, in particular to a whole-process steam turbine modeling and identification method whose actual characteristics vary with working conditions. Background technique [0002] In the context of the continuous development of the power system, which is increasingly interconnected, UHV AC-DC hybrid operation, new energy, and distributed power generation connected to the grid, the scale of the power system continues to expand and the complexity of the system continues to increase. In order to ensure the safe, stable and economical operation of this large hybrid system, it is necessary to carry out simulation tests and research in various stages such as planning, design, construction, operation and maintenance. Power system modeling and simulation can be mainly divided into dynamic simulation and digital simulation. Dynamic simulation is based on physical models, which have the advantages o...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/15
Inventor 张广涛李炳楠唐耀华梁正玉吴坡崔杨仲悟之郭为民段松涛朱峰
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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