Uncoupling control system for non-stable tandem course of chemical ring opening

Abstract

The control system comprises a response controller of given value, a controller for stabilizing response of given value, disturbance observer, identification models of stable process in controlled transtage and astable process in last stage, and signal mixer. Open loop control mode is adopted in given value response. Using proportion or PD controller setup at forward path stabilizes Astable cascading process. Based on amount of deviation between output of id model of process in transtage and actual output in transtage as well as amount of deviation between stabilized output of id model of global cascading process and actual output of process in last stage, influence of interference signal in load is eliminated through modifying treatment from the disturbance observers in innerring and outer ring. The control system can keep favorable robustness and stability, adapt to modeling error of cascading processes and perturbation of procedural parameter in bigger range.

Description

Technical field: [0001] The invention relates to a decoupling control system for a chemical open-loop unstable cascade process, aiming at the measurable open-loop unstable cascade process output of the middle-level stable process in chemical production, using optimal control theory and robust control Based on the theory, a novel decoupling control system is proposed, which belongs to the technical field of industrial process control. Background technique: [0002] Unstable objects in chemical processes are difficult to control, especially for unstable processes with significant time delays. The outstanding problem is that they are more sensitive to load disturbance, which is easy to cause large fluctuations in process output, such as chemical continuous stirred reactor (CSTR). This situation is usually very unfavorable and harmful to actual production. Therefore, when it is possible to measure the output of the intermediate stage process, the cascade control structure is p...

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Problems solved by technology

[0004] Therefore, in some practical industrial applications such as chemical continuous stirring reactors and pharmaceutical processes, engineers and actual users even give up the conventional cascade control structure after weighing the above advantages and disadvantages and still adopt the classic single-loop control structure, making the cascade control The superiority of the structure has not been given full play in the actual applicable occasions and working conditions

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