Robust prediction control method for multi-stage batch asynchronous switching process aiming at various interferences

A technology of predictive control and switching process, applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve the problem of iterative learning control effect reduction and so on

Active Publication Date: 2020-02-07
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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Problems solved by technology

[0003] At present, the mainstream control method for the multi-stage batch asynchronous switching process is the iterative learning method. Under ideal conditions, this control method can effectively control the multi-stage batch process, but in actual production due to the influence of various disturbances , the control effect of iterative learning will be greatly reduced

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  • Robust prediction control method for multi-stage batch asynchronous switching process aiming at various interferences
  • Robust prediction control method for multi-stage batch asynchronous switching process aiming at various interferences
  • Robust prediction control method for multi-stage batch asynchronous switching process aiming at various interferences

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Embodiment

[0104] Embodiment: The present invention simulates the injection stage and pressure holding stage in the injection molding process. The simulation adopts the synchronous switching method and the asynchronous switching method proposed by the present invention respectively. Both methods output responses and control input images such as Figure 1-6 shown.

[0105] Depend on figure 1 with figure 2 It can be seen that when the pressure in the cavity reaches the switching condition of 350 bar, the system state has switched from the injection phase to the pressure holding phase, but the controller has not completed the switching, and there is a time difference of 21s between the switching of the system state and the switching of the controller. At this point the system is in asynchronous switching state.

[0106] Depend on figure 1 with Figure 4 It can be seen that the asynchronous switching state cannot be avoided by using the synchronous switching method, so that the system...

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Abstract

The invention discloses a robust prediction control method for a multi-stage batch asynchronous switching process aiming at various interferences, and belongs to the field of advanced control of industrial processes. The robust prediction control method comprises the following steps: S1, establishing a state space model of a multi-stage batch asynchronous switching system with various interferences; S2, converting the constructed state space model of the asynchronous switching system into an extended state space model of the asynchronous switching system; S3, designing a controller based on the extended model; S4, calculating a controller gain; and S5, calculating the average residence time for each stage. The robust prediction control method for the multi-stage batch asynchronous switching process aiming at various interferences effectively avoids the occurrence of asynchronous state, and ensures that the system stably, quickly and accurately runs, thereby not only improving the production efficiency and the product quality, but also effectively reducing the energy loss and improving the economic benefit of factories.

Description

technical field [0001] The invention belongs to the field of advanced control of industrial processes, and relates to a robust predictive control method for a multi-stage batch asynchronous switching process aimed at multiple disturbances. Background technique [0002] With the development of the economy, the variety of products has increased, the market demand has changed rapidly, and the proportion of batch process in industrial production is also increasing. At present, the batch process has been widely used in food, chemical, pharmaceutical, plastic processing and other industries. Due to the complexity of the batch process and the increasing requirements for control accuracy, traditional control methods have limitations. In addition, when the switching system switches between different stages, there is a situation that the controller cannot be switched in time, and at this time the controller of the previous stage cannot control the next stage well. In previous studie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 施惠元彭博苏成利郝佳静李平文馨
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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