Chemical engineering-oriented priority ascending feasibility judgment and soft constraint adjustment method

Abstract

The invention relates to the field of process industrial control, in particular to a chemical engineering-oriented priority ascending feasibility judgment and soft constraint adjustment method, which comprises the following steps of initializing feasibility judgment and soft constraint adjustment; judging hard constraint feasibility; carrying out step-by-step soft constraint adjustment and solidification; and determining a steady-state optimization feasible region. In order to solve the problem of incompleteness of existing priority ascending feasibility judgment and soft constraint adjustment in the chemical process, under each priority, hard constraints of all priorities and soft constraints of the current priority are introduced at the same time for judgment and adjustment, and then judgment and adjustment are completed step by step until feasibility judgment and soft constraint adjustment are achieved for all priorities. According to the method, the problem of incompleteness of an existing priority ascending strategy is solved, the stability and the reliability of related process control industrial software can be effectively improved, and then guarantee is provided for stable operation of related chemical processes.

Description

technical field [0001] The invention belongs to the field of process industry control, in particular to a control method for the feasibility judgment and soft constraint adjustment of priority ascending order of chemical process equipment. Background technique [0002] Hard constraints refer to constraints that cannot be violated by operating variables and controlled variables in the actual running process; soft constraints refer to constraints that can be violated but not expected to be violated by manipulated variables and controlled variables in the actual process; priority refers to different controlled variables The importance of constraints, the lower the priority level of international conventions, the higher the importance of constraints; ascending order refers to the completion of related work in the order of priority levels from low to high, that is, to minimize the relaxation of the most important soft constraints. [0003] In the actual chemical control process, ...

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Problems solved by technology

[0004] Aiming at the demand for multi-input multi-output coordinated optimization control of existing chemical process devices and the incompleteness of the priority ascending strategy, the present invention proposes a control for the feasibility determination and soft constraint adjustment of priority ascending order that considers all hard constraints in advance for the chemical process Implementation

Based on the strategy of feasibility determination and soft constraint adjustment in ascending order of priority considering all hard constraints for the chemical process proposed by the present invention, it is used to improve and solve the problem of feasibility determination and adjustment of the feasible domain of steady-state optimization, and then realize multi-entry Coordinated optimization and control between operating variables and controlled variables in multiple chemical plants

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