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Thermal power set prediction function control simplification method and application thereof

A technology of predictive function control and thermal power units, which is applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve the problems that are not conducive to improving the control quality of the predictive function control system, complex structure, and inconvenient parameter adjustment. Achieve the effects of good adaptability to working conditions, convenient parameter adjustment, and simple structure

Active Publication Date: 2017-05-31
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +1
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Problems solved by technology

The conventional predictive function control structure is relatively complex, and it needs to be controlled in the form of exponential coefficients. It is inconvenient to adjust the parameters, and it is not conducive to improving the control quality of the predictive function control system in engineering applications.

Method used

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  • Thermal power set prediction function control simplification method and application thereof
  • Thermal power set prediction function control simplification method and application thereof
  • Thermal power set prediction function control simplification method and application thereof

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] 1. Predictive function control simplification method

[0030] For the typical first-order plus pure delay objects in the industry, the predictive model of the predictive function controller is selected as the first-order plus delay objects, namely

[0031]

[0032] When using the step function, there is

[0033] u(k+i)=u(k),i=1,2...P-1 (2)

[0034] If the sampling period is T s , let D=T d / T s , the following expression can be obtained:

[0035] the y pav (k)=y(k)+y m (k)-y m (k-D) (3)

[0036] The control output of the PFC whose object is the first order plus pure lag is

[0037]

[0038] In the above formula, T R is the reference trajectory time constant, p is the optimal length of the prediction time domain, and it is the index coefficient.

[0039] The present invention simplifies the optimized control law in (...

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Abstract

The invention discloses a thermal power set prediction function control simplification method and an application thereof. A routine prediction function control structure is relatively complex, an index coefficient mode is required to employ for control, parameter adjustment is not convenient, and an engineering application is not good for improving control quality of a prediction function control system. According to the method, on the basis of routine PFC optimal control rules, the index coefficient is simplified to be a multiplier coefficient, prediction time domain optimization length is simplified as a prediction adjusting coefficient, and controlled object output after correction is simplified as actual controlled object output. The method is advantaged in that the prediction function control system is guaranteed to have relatively strong robustness, control quality of the prediction function control system is improved, the prediction function control system can be in an automatic adjusting state when the thermal power set is in a disturbance state, fluctuation amplitude is reduced, and operation workload is further substantially reduced.

Description

technical field [0001] The invention relates to object control of a thermal power unit, in particular to a simplified method for controlling a steam temperature prediction function of a thermal power unit and its application. Background technique [0002] The system objects of large-scale thermal power units have large delay, large inertia, and time-varying properties. At present, cascade PID and leading differential control are widely used, and it is difficult to obtain satisfactory control effects. Research on the application of advanced control strategies for thermal power plant system objects emerges in an endless stream, and the research on the application of model predictive control in system object control has achieved fruitful results. The conventional predictive function control structure is relatively complex, and needs to be controlled in the form of exponential coefficients. It is inconvenient to adjust the parameters, and it is not conducive to improving the con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 尹峰李泉罗志浩
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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