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Comparison of model-based and conventional controllers on a pilot-scale heat exchanger
Pramod R Raul1, Haritha Srinivasan, Sanket Kulkarni
1School of Mechanical & Aerospace Engineering, Oklahoma State University, OSU, Stillwater, OK 74078-5021, USA.
ISA Transactions
|March 5, 2013
Summary
Proportional-Integral (PI) control struggles with nonlinear heat exchangers. Process-Model Based Control (PMBC) effectively manages nonlinearities and variable delays, offering superior performance over Generic Model Control (GMC-SS) and PI across the full operating range.
Area of Science:
- Chemical Engineering
- Process Control Systems
Background:
- Conventional Proportional-Integral (PI) control often exhibits limitations in managing complex industrial processes.
- Heat exchangers present significant control challenges due to nonlinear dynamics and variable delays.
Purpose of the Study:
- To compare the efficacy of two nonlinear model-based control strategies against conventional PI control for a pilot-scale heat exchanger.
- To evaluate Generic Model Control using a steady-state model (GMC-SS) and Process-Model Based Control (PMBC) for nonlinear process control.
Main Methods:
- Implementation of PI, GMC-SS, and PMBC on a pilot-scale heat exchanger.
- Utilizing first-principles models for nonlinear process characterization.
- Comparative analysis of controller performance across the entire operating range.
Main Results:
- PI control performs adequately only within a narrow operating range.
- GMC-SS addresses nonlinearity but fails to compensate for variable delays, leading to poor control.
- PMBC demonstrates robust control performance throughout the full operating range, effectively managing nonlinearities and delays.
Conclusions:
- PMBC offers superior control for nonlinear heat exchangers compared to PI and GMC-SS.
- PMBC simplifies tuning with only one coefficient, unlike PI and GMC-SS which require two.
- Model-based control strategies, particularly PMBC, are essential for optimizing performance in challenging process environments.
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