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化工生产过程中存在着大量的多变量时滞过程,由于模型输出变量间的耦合及时滞因子的影响,对于这类模型的控制往往很困难。首先利用伴随矩阵解耦控制方法对多变量时滞过程的输出进行解耦,该解耦方法不仅可以针对有输入输出时滞的多变量系统,也可以对有状态时滞的多变量系统进行解耦。考虑到解耦后的子系统比较复杂,在利用系统采样输入输出数据的基础上对解耦后的系统进行模型精简,然后利用简化模型设计基于内模原理(IMC)的PID控制器,实现解耦系统对定值信号的跟踪控制。最后通过2个化工过程中的例子进行仿真研究,证明该方法的有效性和优越性。
There are a lot of multivariable time-delay processes in the chemical production process. Due to the coupling between the output variables of the model and the time-lag factor, it is often difficult to control such models. Firstly, the output of multi-variable time-delay process is decoupled by using the adjoint matrix decoupling control method. The decoupling method can not only solve the problem of multivariable systems with input-output delay, but also multivariable systems with state-delay Coupling. Considering that the decoupled subsystems are complex, the decoupled system is simplified based on the input and output data of the system sampling. Then a simplified model is used to design the PID controller based on the inner model principle (IMC) to realize the solution Tracking control of the fixed signal by the coupling system. Finally, two examples of chemical processes are used to simulate and prove the effectiveness and superiority of this method.