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Supercritical unit coordinated predictive function control algorithm

A predictive function control, supercritical unit technology, applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve the problem that the quality of the coordinated control system needs to be improved, so as to meet the needs of working conditions and improve the control quality. , the effect of simple structure

Active Publication Date: 2017-08-18
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +1
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Problems solved by technology

[0003] It is precisely because the mathematical model of the above-mentioned control objects 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 pressure and temperature, and the quality of the coordinated control system needs to be improved

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Embodiment Construction

[0068] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0069] 1. Conventional control algorithm with disturbance predictive function

[0070] 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 channel model G m1 (s) and the perturbed channel model G m2 (s), assuming that they are all first-order plus delay models, that is:

[0071]

[0072]

[0073] When using a basis function, there are:

[0074] u(k+i)=u(k)i=1,2,...,H-1

[0075] D(k+i)=D(k)i=1,2,...,H-1 (3)

[0076] The predicted output for each channel is:

[0077]

[0078] The model output is:

[0079] the y m (k+H)=y m1 (k+H)+y m2 (k+H) (5)

[0080] According to the extreme value of the optimization index, the optimal control law can be obtained...

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Abstract

The invention discloses a supercritical unit coordinated predictive function control algorithm. It is difficult for a conventional PID control system to consider the rapidity of load and stability of pressure and temperature at the same time, the quality of a coordinated control system needs to be improved. According to the supercritical unit coordinated predictive function control algorithm, predictive function control is applied to a pressure closed loop of a supercritical unit coordinated control system, a main steam pressure predictive function control system is formed. A control valve instruction and a coal quantity instruction are taken as a disturbance signal source of the whole pressure system. The predictive function control is applied to a temperature control loop of the supercritical unit coordinated control system, and an overhigh temperature prediction function control system is formed. A water supply instruction is taken as a disturbance signal source of a whole temperature system. According to the supercritical unit coordinated predictive function control algorithm, the control quality of the supercritical unit coordinated system is improved, and the rapidity of load and stability of pressure and temperature are considered at the same time.

Description

technical field [0001] The invention relates to the control of an ultra (super) critical thermal power unit coordination control system, in particular to a super (super) critical unit coordination prediction function control algorithm based on a leading disturbance model. Background technique [0002] The object of the large-scale super (ultra)critical thermal power unit coordination system is a three-input and three-output system with strong coupling. The pressure control object and temperature control object have large delay, large inertia and time-varying characteristics, and the response is slow; the load control object has rapidity. There is a strong coupling between them, forming a contradictory unity. [0003] It is precisely because the mathematical model of the above-mentioned control objects 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 pressure and tem...

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Application Information

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IPC IPC(8): G05B13/04
CPCG05B13/048
Inventor 尹峰李泉罗志浩
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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