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Model used for carrying out primary frequency modulation analysis coordination control on boiler, steam turbine and power grid

A coordinated control, steam turbine technology, applied in general control systems, adaptive control, control/regulation systems, etc., can solve problems such as unconsidered boilers, unfavorable safe and stable operation of power systems, and potential safety hazards

Active Publication Date: 2017-03-22
黑龙江工研龙创智通云管科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] From the above analysis, it can be seen that the control focus of the traditional machine-network coordination and machine-boiler coordination is on the steam turbine generator set and the power grid. The primary frequency regulation control loop only reflects the negative feedback control strategy for the frequency difference of the power grid, and does not consider the impact on the boiler. , resulting in a greater security risk
Especially with the development of supercritical and ultra-supercritical units, if the characteristics of the boiler are not considered in the primary frequency regulation control, it will bring great resistance to large-capacity and high-parameter thermal power units participating in primary frequency regulation, which is not conducive to the safety and stability of the power system run

Method used

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  • Model used for carrying out primary frequency modulation analysis coordination control on boiler, steam turbine and power grid
  • Model used for carrying out primary frequency modulation analysis coordination control on boiler, steam turbine and power grid
  • Model used for carrying out primary frequency modulation analysis coordination control on boiler, steam turbine and power grid

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specific Embodiment approach 1

[0086] Specific implementation mode 1: Combination Figure 1-Figure 13 To explain this embodiment, the coordinated control model for boiler, steam turbine and power grid primary frequency modulation analysis described in this embodiment is realized by the following steps:

[0087] Step 1: Establish a model reflecting the mechanism of the once-through boiler in supercritical and ultra-supercritical units: the once-through boiler dynamically considers the combustion system, water wall and superheater, based on the working fluid energy balance equation, the working fluid mass balance equation, and the working fluid momentum balance equation. Mechanism model of once-through boiler,

[0088] After the working medium flows out of the economizer, it enters the water wall. After passing through the water wall, the working medium changes from water to steam, and the outlet of the water wall is a micro hot spot; the working medium in the water wall meets the energy balance equation and mass ...

Embodiment

[0162] According to the 180s frequency data of a certain power grid under a large load change, the boiler-machine-network coordinated control model described above is used as the object to record the main steam pressure signal and frequency difference signal simulation image under the grid energy balance state, such as Picture 14 Shown. The rated main steam pressure is 24.2MPa, and the reference value of the frequency difference is 50Hz. by Picture 14 It can be seen that the primary frequency modulation analysis coordinated control model for boilers, steam turbines and power grids can accurately collect the main steam pressure signals and frequency difference signals in supercritical and ultra-supercritical units, providing a design platform for model users. Users can design the controller according to their needs, and use these two signals to achieve the purpose of coordinated control of the boiler, steam turbine and power grid.

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Abstract

The invention relates to a model used for carrying out primary frequency modulation analysis coordination control on a boiler, a steam turbine and a power grid and particularly relates to a boiler, steam turbine and power grid three-party coordination control supercritical and super-supercritical set coordination control model used for carrying out primary frequency modulation analysis. Control focus of machine-network coordination and machine-furnace coordination in the prior art is a turbo generator set and a power grid, only negative feedback control strategies of grid frequency difference are reflected in a primary frequency modulation control loop, influence on the boiler is not considered, so a hidden safety trouble exists. The method for problem solution is characterized by comprising steps that 1, a DC boiler mechanism model in a supercritical and super supercritical set is established; 2, a supercritical and super supercritical DC boiler controller model is established; 3, a steam turbine primary frequency modulation model is established; 4, an electric power system frequency modulation model including different types of sets is established; and 5, a steam turbine power given signal is corrected. The model is advantaged in that the model is applicable to the boiler, steam turbine and power grid coordination control field.

Description

Technical field [0001] The invention relates to a coordinated control model of a supercritical and ultra-supercritical unit for the three-party coordinated control of a boiler, a steam turbine, and a power grid for primary frequency modulation analysis. Background technique [0002] It is the current trend to develop clean energy and improve the conversion efficiency of fossil energy. Under this development trend, small-capacity thermal power units have gradually withdrawn from operation due to high coal consumption and low energy utilization rate. Large-capacity, high-parameter supercritical and ultra-supercritical units are being promoted. However, when the state parameters of the water in supercritical and ultra-supercritical units reach the critical point (pressure 22.129MPa, temperature 374.15℃), the steam density is equal to the water density, and the natural circulation of the drum boiler is not applicable under supercritical conditions, which makes the direct flow The bo...

Claims

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Application Information

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IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 郭钰锋陈润欣石建国王琦张冬蕊马欣彤张童童
Owner 黑龙江工研龙创智通云管科技有限公司
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