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A new two-degree-of-freedom level control scheme
Weidong Zhang1, Xiaoming Xu, Yugeng Xi
1Department of Automation, Shanghai Jiaotong University, People's Republic of China. wdzhang@mail.sjtu.edu.cn
ISA Transactions
|August 6, 2002
Summary
This study presents a new level control scheme for processes with delays. The proposed internal model control approach offers a simple, transparent design for robust stability and smooth responses.
Area of Science:
- Control Engineering
- Process Control
Background:
- Traditional level control schemes often struggle with processes exhibiting dead time.
- Achieving robust stability and smooth responses simultaneously can be challenging.
Purpose of the Study:
- To analyze a two-degree-of-freedom (2DOF) level control scheme for delay-free processes.
- To develop an alternative level control scheme for processes with dead time.
- To ensure smooth responses and robust stability in the proposed control scheme.
Main Methods:
- Analysis of nominal performance and robustness for a 2DOF control scheme.
- Derivation of sufficient and necessary conditions for robust stability.
- Analytical development of an alternative level control scheme using internal model control (IMC).
Main Results:
- Conditions for robust stability of the 2DOF scheme were derived.
- A novel IMC-based level control scheme was developed for processes with dead time.
- The proposed scheme demonstrated simplicity, transparency, and effective integration of performance and robustness.
Conclusions:
- The developed IMC-based level control scheme provides a robust and simple solution for processes with dead time.
- The scheme analytically ensures smooth responses and addresses robust stability concerns.
- Numerical examples validate the superiority of the proposed scheme over existing methods.