Polypropylene apparatus grade switching and controlling method

Abstract

The invention relates to a method for switching and controlling polypropylene device mark. The method comprises: establishing a linear subsystem optimal controller according to the systematic linear performance index by establishing a polypropylene mark switching process discrete time state space Hammerstein model; designing state observation through a pole assignment method according to an expected pole of a systematic state observer; establishing a model forecasting controller based on the state observer according to a systematic quadratic performance index; updating initial conditions of the optimal control problem; and then carrying out the rolling optimization calculation of the current forecasting control variable repeatedly till the mark switching process is switched to a target market and stable production. The method has simple design, easy understanding, easy realization of online commissioning, and good practicability. The method can realize the continuous automatic switching of polypropylene marks, particularly marks of different categories on a wide range, thereby greatly shortening the mark switching time, reducing the emission of unqualified products, and improving the production economic benefits and market competitiveness.

Description

technical field [0001] The invention relates to a method for controlling the switching of grades of polypropylene devices. Background technique [0002] In order to meet the market's diverse demands for polypropylene products and higher quality requirements, as well as to pursue higher corporate economic benefits, polypropylene plants need to frequently switch brands for production. At the same time, with the development of polypropylene industry and production technology, the scale of production is getting larger and larger, and the switching frequency of brands is getting higher and higher. Affect the production economic benefits and energy saving and consumption reduction indicators of the enterprise. The brand switching process of large polypropylene plants is a complex multi-variable, strong coupling, and multi-constrained "essential" nonlinear process. Its essence is the transformation of one product quality (brand) into another product quality, which is reflected in ...

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Problems solved by technology

[0003] In order to overcome the disadvantages of complicated design, difficulty in online operation, and poor practicability of the existing polypropylene device grade switching control method, the present invention provides a polypropylene device grade with simple design, easy understanding, online operation, and strong practicability switch control method

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