Minimum operation time control method of multistage intermittent process

Abstract

The invention discloses a minimum operation time control method of a multistage intermittent process. The method comprises the following steps: a hybrid state space model of an intermittent process is established; a two-dimensional augmentation model of the intermittent process is constructed, and accordingly, a two-dimensional closed-loop hybrid state space model is obtained; and for the two-dimensional closed-loop hybrid state space model of the intermittent process, by use of an average residence time method, the total minimum operation time of adjacent stages in the intermittent process is solved. According to the invention, for the multistage feature, the repletion feature and the two-dimensional feature of the intermittent process, a two-dimensional iteration learning controller is designed, and the switching sequence in a two-dimensional form is determined on the basis that the multistage intermittent process is taken as a switching system. The control performance of the intermittent process under the condition of the controller and the switching process is enabled to be the best, the total minimum operation time of the adjacent stages is solved, and accordingly, solution of the minimum time of total operation can be expanded to multiple stages, such that the time cost can be decreased, the production efficiency is substantially improved, and high-efficient production operation in the intermittent industry of China is effectively facilitated.

Description

technical field [0001] The invention belongs to the field of information technology, and in particular relates to a method for controlling the minimum running time of a multi-stage batch process. Background technique [0002] The batch process is the first choice for the production of multi-variety, small-batch, high-value-added products. Because it meets the needs of modern production, it occupies a high proportion in my country's industrial production. In a typical batch process, products are always produced batch by batch, relying on repeated production to obtain a large number of identical products, that is, the batch process has repetitive characteristics; in addition, the batch process also has dynamic and rapid evolution within batches and batch-to-batch Dynamically slowly evolving two-dimensional (2D) properties. [0003] In each batch, the batch process is a multi-stage process of producing products. Due to the different production purposes and process characterist...

AI Technical Summary

Problems solved by technology

Previous research on the control of batch processes often only considered single-stage high-precision control, and only considering single-stage optimal control cannot guarantee global optimum and overall efficient operation of production

In addition, in the actual industrial process, the running time of the stage is mostly obtained from actual experience or estimation, which also prolongs the time required for the actual operation of the batch process to a certain extent, and brings essential difficulties to the efficient operation of the batch process

In the existing theoretical research, there are no research results on the running time of each stage, only some research on the switching conditions and switching time of adjacent stages

Images