Manual-automatic switching method based on generalized predictive control

Abstract

The invention discloses a manual-automatic switching method based on generalized predictive control, and constructs a model of a generalized predictive control module, the function expression of which is as follows: PΔu(t)=Qw(t)-Sy(t). When switching from the generalized predictive control module to the manual control module or the PID control module, the input u(t) of the controlled object model and the output y(t) of the controlled object model are fed back to the generalized predictive control module, P =[10...0] 1×Nu ; where n A , n B Indicates the order, N u Indicates the control time; when the manual control module or the PID control module is switched to the generalized predictive control module, Q=Q 0 , S=S 0 , P=P 0 ; among them, Q 0 is the optimal solution parameter for generalized predictive control; S 0 is the optimal solution parameter for generalized predictive control; P 0 Controlling optimal solution parameters for generalized prediction. The invention also discloses a manual-automatic switching system based on generalized predictive control. The invention has the advantage of no disturbance in switching between generalized predictive control and PID control or manual control.

Description

technical field [0001] The invention belongs to the technical field of automatic control, in particular to a manual-automatic switching method based on generalized predictive control. Background technique [0002] In the field of automatic control, there is a class of control objects that have the characteristics of large inertia, large time delay, and strong noise. For example, the main steam temperature and reheat steam temperature systems of thermal power units are typical thermal objects of this type. At present, for this kind of control object, the traditional PID control method is still widely used. It is a kind of feedback correction based on the deviation between the set value and the measured value. On the issue, it is difficult to achieve a good control effect. [0003] The predictive control that has emerged in recent years can overcome the shortcomings of PID control such as untimely response and large control deviation, and it is easy to realize the adaptive fu...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the disadvantages of the prior art that there is a large disturbance when switching between generalized predictive control and PID control or manual control, which leads to the technical problem that the system will be unstable in practical application.

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