Subcritical unit coordination prediction function control algorithm based on leading disturbance model

A technology of predictive function control and subcritical unit, which is applied to electric controllers, controllers with specific characteristics, etc., can solve the problem of the quality of the coordinated control system needs to be improved, and achieves the stability of pressure, the speediness, and the improvement of Control the effect of quality

Active Publication Date: 2017-05-10
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +1
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Problems solved by technology

[0003] In the coordinated control of the coordinated control system of thermal power units, the mathematical model of the control object has strong coupling characteristics. It is difficult for the conventional PID control system to take into account the rapidity of the load and the stability of the pressure. The quality of the coordinated control system needs to be improved.

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  • Subcritical unit coordination prediction function control algorithm based on leading disturbance model
  • Subcritical unit coordination prediction function control algorithm based on leading disturbance model
  • Subcritical unit coordination prediction function control algorithm based on leading disturbance model

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[0039] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0040] 1. Conventional control algorithm with disturbance predictive function

[0041] according to figure 1 , when the external disturbance signal of the control system is measurable, the disturbance model of the system can be determined through experiments. At this time, the system has two models, namely the object model G m1 (s) and perturbation model G m2 (s), assuming that they are all first-order plus delay models, that is:

[0042]

[0043]

[0044] When using a basis function, there are:

[0045] u(k+i)=u(k) i=1,2,...,H-1

[0046] D(k+i)=D(k) i=1,2,...,H-1 (3)

[0047] The predicted output of each model is:

[0048]

[0049] The predictive model output is:

[0050] the y m (k+H)=y m1 (k+H)+y m2 (k+H) (5)

[0051] According to the extreme value of the optimization index, the optimal control law can be obtained as:

...

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Abstract

The invention discloses a subcritical unit coordination prediction function control algorithm based on a leading disturbance model. The conventional PID control system can not consider both the load quickness and the pressure stability, and the quality of a coordination control system needs to be improved. The prediction function control is applied to a pressure closed loop of the subcritical unit coordination control system, a prediction function control system is formed, and the pressure closed loop has a delay inertial link; the load closed loop of the subcritical unit coordination control system adopts PID control, and a load instruction adopts a datum line plus differential mode for a coal quantity feedforward system; an actual turbine control valve instruction serves as a disturbance signal source, and the optimal control law is acquired according to a prediction model of the prediction function control system; and simplification is carried out on the basis of the optimal control law, and a simplified optimal control law is obtained. The control quality of the subcritical unit coordination control system is improved, and both the load quickness and the pressure stability can be considered.

Description

technical field [0001] The invention relates to the control of a subcritical thermal power unit coordination control system, in particular to a subcritical unit coordination prediction function control algorithm based on a leading disturbance model. Background technique [0002] The coordinated control system of large subcritical thermal power units is a dual-input and dual-output system with strong coupling. The boiler and steam turbine system can be simplified into a dual-input and dual-output system with strong coupling at a given operating point. The pressure control object has a large Delay, large inertia, time-varying, slow response, fast load control object, and strong coupling between them constitute a contradictory unity. [0003] In the coordinated control of the coordinated control system of thermal power units, the mathematical model of the control object has strong coupling characteristics. It is difficult for the conventional PID control system to take into acc...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B11/42
CPCG05B11/42
Inventor 尹峰李泉罗志浩
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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