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Reheat steam temperature adjusting method based on hierarchical scheduling multi-model predictive control

A technology of predictive control and reheat steam temperature, applied in the field of thermal control and boiler steam temperature control of thermal power units, can solve the problems of difficult application of engineering practice, poor quality of reheat steam temperature control of thermal power units, etc., to improve thermal cycle efficiency and safety, less dynamic and steady-state deviations, and the effect of reducing usage

Active Publication Date: 2019-12-31
国家能源集团谏壁发电厂
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Problems solved by technology

[0005] Technical problem: The purpose of this invention is to solve the problem of poor reheating steam temperature control quality of thermal power units and difficulty in applying traditional predictive control to engineering practice

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  • Reheat steam temperature adjusting method based on hierarchical scheduling multi-model predictive control
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  • Reheat steam temperature adjusting method based on hierarchical scheduling multi-model predictive control

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] figure 1 Multi-model predictive control structure diagram for hierarchical scheduling, in the figure, y r Indicates the set value of reheat steam temperature, u nj Indicates that according to the selected L j The control quantity of the generalized predictive controller designed by the njth sub-model of the layer, u represents the weighted overall control quantity, that is, the flue gas baffle opening instruction, and y represents the actual reheat steam temperature under the action of the control quantity u. The reheat steam temperature adjustment method based on hierarchical scheduling multi-model predictive control, the specific implementation steps are as follows:

[0024] Step 1: According to the effect of the flue gas baffle in the 50%-100% load section of the thermal power unit on the final stage reheating steam temperature T ...

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Abstract

The invention discloses a reheat steam temperature adjusting method based on hierarchical scheduling multi-model predictive control. Transfer function models of influences of a plurality of flue gas baffles on last-stage reheat steam temperature are built in low, medium and high load sections of a thermal power generating unit, prediction controllers are designed according to the sub-models, the control quantity calculated by each controller is weighted to act on a system, different model sets are switched according to different operation conditions of the unit, and the control precision and the algorithm operation efficiency are both considered. According to the method, the automation degree of the flue gas baffles can be improved, and the workload of operators is reduced. Meanwhile, whenthe load is changed in a large range, the use of reheat desuperheating water is reduced, and the control precision of the steam temperature of an outlet of a last-stage reheater can be improved.

Description

technical field [0001] The invention relates to the field of steam temperature control of thermal power unit boilers, in particular to a method for adjusting the temperature of reheated steam, which belongs to the field of thermal engineering control. Background technique [0002] The stable control of reheat steam temperature in thermal power units is of great significance to improve the economy and safety of the unit. However, the current strategy for adjusting reheat steam temperature in thermal power units cannot meet the needs of reheat steam temperature adjustment. Accident water spray is often used to control the temperature of reheat steam. Adjusting and increasing the humidity of the steam turbine inlet will affect the safe operation of the steam turbine. Because the flue gas baffle has a large hysteresis and strong nonlinearity in the regulation of the reheated steam temperature, it is difficult for most power plants to put it into automatic operation. [0003] Pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22G5/04
CPCF22G5/04
Inventor 刘桂生赵重阳王煜伟丁永三张建伟
Owner 国家能源集团谏壁发电厂
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