Robust predictive control method for multi-stage batch asynchronous switching process against multiple disturbances
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 achieve the effect of improving production efficiency
Active Publication Date: 2022-04-12
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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[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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[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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A robust predictive control method for a multi-stage batch asynchronous switching process with multiple disturbances, belonging to the advanced control field of industrial processes, including the following steps: Step 1: Establishing the state space of a multi-stage batch asynchronous switching system with multiple disturbances model; Step 2: Transform the constructed state space model of asynchronous switching system into an extended state space model of asynchronous switching system; Step 3: Design a controller based on the above extended model; Step 4: Calculate the controller gain; The average residence time of each stage. The invention effectively avoids the occurrence of asynchronous state and makes the system run stably, quickly and accurately, which not only improves production efficiency and product quality, but also effectively reduces energy loss and improves the economic benefits of the factory.
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...
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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