基于Pade近似一般形式的IMC-PID控制器设计

内模控制方法因具有诸多优点而引起了业界的广泛关注,但难以在DCS中直接实现,现有的IMC-PID设计方法存在着只针对特定模型才能设计或通用设计但近似程度偏低的问题,提出了一种新的IMC-PID控制器设计方法,采用一般形式的Pade多项式逼近IMC-PID转化过程中出现的复杂项,然后对照该Pade多项式和PID控制器表达式设计PID控制器参数.该方法广泛适用于各种单变量对象,也能够毫无修改地应用于多变量系统的IMC-PID控制器参数设计.与基于Maclaurin展式的IMC-PID设计方法相比,该方法提供了具有更强理论依据的微分滤波时间常数计算式,能够获得与内模策略更为接近的控制效果.

IMC-PID Controller Design Based on General Form of Pade Approximation

A design method of IMC-PID controller designing is presented.The general form of Pade polynomial is used to approach a complicated term appeared in the IMC-PID transformation.Then the PID parameters are obtained by comparing the Pade polynomial with the expression of PID controller.The proposed method can be widely used in IMC-PID controller design not only for classes of single-loop models,but also for multi-variable systems.Compared with the Maclaurin expansion-based method,a more theoretical way to calcu...