Multi-model adaptive control method for denitration control system

An adaptive control and control system technology, applied in the field of denitrification control, can solve complex problems, meet environmental protection requirements, be easy to implement, and have simple control ideas

Inactive Publication Date: 2017-10-20
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, both the main PID and the secondary PID of this invention need to be corrected, which is more complicated

Method used

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  • Multi-model adaptive control method for denitration control system
  • Multi-model adaptive control method for denitration control system
  • Multi-model adaptive control method for denitration control system

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] Such as figure 1 , 2 As shown, the control method is applied to the denitrification ammonia injection control system including the SCR denitrification system, the main PID controller and the auxiliary PID controller. The main PID controller and the auxiliary PID controller are controlled in a cascade connection, including Follow the steps below:

[0032] S1. Establish sub-models of the controlled object under different loads:

[0033] The secondary loop in the cascade control and the SCR denitrification system are used as the controlled object, and the object models are identified under different loads, and the identified m models are used as m sub-models;

[0034] S2. Design PID controllers for m sub-models respectively:

[0035] For the established m sub-models, design corresponding PID controllers and use the critical proportional...

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Abstract

The invention relates to a multi-model adaptive control method for a denitration control system. The method comprises steps that 1, sub models of a controlled object under different loads are established; 2, PID controllers are respectively designed according to the m sub models; output of the controlled object and output of each sub model are acquired through measurement; 4, deviation of output of the controlled object and output of each sub model is acquired; 5, a weight wi of each controller is solved; 6, control quantities u1(k) to um(k) of the controllers are weighted to output to acquire a global control quantity up(k); 7, the global control quantity is sent to the controlled object and the sub models for control; and 8, the process returns to the step 3. The method is advantaged in that a global controller can be made to output the optimal control quantity in real time under the changeable load condition, the purpose of adaptive load change is realized, change of an export NOx concentration can be timely tracked according to change of ammonia injection amount, export NOx concentration fluctuation of the denitration system can be effectively reduced, so the NOx concentration is stabilized to be in an index required by the environmental protection department, control thinking is simple, and the method is easy for realization in a power plant DCS.

Description

technical field [0001] The invention belongs to the field of denitrification control, and in particular relates to a multi-model self-adaptive control method for a denitrification control system. Background technique [0002] At present, thermal power plants generally use a cascade control system to control the concentration of nitrogen oxides (NOx) at the outlet of the SCR denitrification system. The outlet NOx concentration is the main adjustment parameter, and the ammonia flow rate is the auxiliary adjustment parameter. Both the main and auxiliary regulators use a single PID control. . Through the adjustment of the secondary loop, the injection volume can quickly track the output of the main regulator, and through the adjustment of the main loop, the outlet NOx concentration can track the set value of the outlet NOx concentration. [0003] Thermal power plants adopt cascade control system to control the NOx concentration at the outlet of SCR denitrification system. The m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 尹子剑金秀章丁续达刘潇张少康张琨张扬
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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