This article presents a unified approach of controller design in cascade control structure (CCS) for unstable, integrating and stable processes with dead-time to achieve enhanced load disturbance rejection. The design of inner and outer loop controllers in CCS is based, partially on the direct synthesis approach and partially on the pole placement method. First, the parameters of the inner loop controller are obtained and then the outer loop controller is designed by considering the inner loop as a part of the primary plant. The proposed design approach deals with a wide range of processes having unstable, integrating and stable dynamics in a unified way. It is applied directly on the higher and lower order processes, as the proposed strategy is acquitted from the approximation of the dead-time and model order reduction of the plant. Simulations have been conducted to show the efficacy of the present approach. The results shows that the present approach provides enhanced regulatory performance as compared to the recently reported approaches from the literature.

本文提出了一种在级联控制结构 (CCS) 中设计控制器的统一方法，用于具有死区时间的不稳定、集成和稳定过程，以实现增强的负载干扰抑制。CCS 中内环和外环控制器的设计部分基于直接综合方法，部分基于极点放置方法。首先，获得内环控制器的参数，然后通过将内环视为主设备的一部分来设计外环控制器。所提出的设计方法以统一的方式处理具有不稳定、集成和稳定动力学的广泛过程。它直接应用于高阶和低阶过程，因为所提出的策略是从死区时间和工厂模型阶数减少的近似中获得的。已经进行了模拟以显示本方法的功效。结果表明，与最近报道的文献方法相比，本方法提供了增强的监管性能。