精馏塔的机理模型仿真和多回路控制器设计方法研究

Simulation and multi-loop Controller design research of distillation column

精馏塔在我国化学工业的生产过程中扮演着十分重要的角色。它往往具有多个控制回路,并且回路之间通常都存在比较强的耦合作用,这给精馏塔的控制带来了困难。本文从精馏塔的机理模型出发,通过系统辨识的方法获得精馏塔各个回路之间的传递函数,然后应用等效开环传递函数法将这些互相耦合的回路分解为多个相互之间没有关联的SISO回路,再对这些回路单独整定PID参数。从仿真结果来看,这种PID整定方法相比传统方法,其设计的控制器能获得比较好的控制效果。

Distillation column plays a very important role in the chemical production process. It often has multiple control loops,and there is usually a strong coupling between the circuits,which brings difficulties to the control of the distillation column. Based on the mechanism model of the distillation column,the transfer function between the circuits of the rectification column is obtained by the method of system identification. Then,the equivalent openloop transfer function method is used to decompose these mutually coupled circuits into multiple Associated SISO loops,and then separate the PID parameters for these circuits. From the simulation results,compared to the traditional method,the design of the controller this PID tuning method can get a better control effect.