Chiluka Suresh Kumar, Ambati Seshagiri Rao, Seepana Murali Mohan, Babu Gara Uday Bhaskar
Department of Chemical Engineering, National Institute of Technology, Warangal, Telangana, 506 004, India.
ISA Trans. 2021 Sep;115:163-191. doi: 10.1016/j.isatra.2021.01.018. Epub 2021 Jan 9.
In real-world applications, it is often desired that the design of a closed-loop system must attain not only high performance but also robustness. This paper presents a novel robustness-based formulation for control for discrete time minimum and non-minimum phase systems using the Virtual Reference Feedback Tuning (VRFT) framework. The proposed idea is to design robust lower and higher order Proportional Integral and Derivative (PID) controller using Maximum Sensitivity (M) based closed-loop reference model by minimization of the VRFT objective function (J) The efficacy of the approach is verified on various systems in simulation and also demonstrated on the Temperature Control Process and Level Control Process experimental setups. The proposed VRFT approach provides improved performance and robustness for set point tracking and disturbance rejection. Also, the proposed approach ensures stability and specific robustness of the closed-loop system. Further, the fragility of the controller is investigated for perturbations in the controller parameters.
在实际应用中，通常希望闭环系统的设计不仅要达到高性能，还要具备鲁棒性。本文提出了一种基于鲁棒性的离散时间最小相位和非最小相位系统控制方法，该方法使用虚拟参考反馈整定（VRFT）框架。所提出的思路是通过最小化VRFT目标函数（J），使用基于最大灵敏度（M）的闭环参考模型来设计鲁棒的低阶和高阶比例积分微分（PID）控制器。该方法的有效性在各种系统的仿真中得到了验证，并且在温度控制过程和液位控制过程实验装置上也得到了证明。所提出的VRFT方法在设定值跟踪和干扰抑制方面提供了改进的性能和鲁棒性。此外，所提出的方法确保了闭环系统的稳定性和特定的鲁棒性。进一步地，研究了控制器参数摄动时控制器的脆弱性。
