PSE Asia 2019

The 8th International Symposium on Design, Operation, and Control of Chemical Processes, January 13-16, 2019

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 One-day workshop: Economic Process Control



The organizing committee of PSEAsia 2019, The Thai Institute of Chemical Engineering and Applied Chemistry, and the Computational Process Engineering Research Unit, Chulalongkorn University would like to invite you to participate in the one-day workshop on Economic Process Control. The content of the workshop will be organized and presented by Professor Sigurd Skogestad, NTNU and Professor Nitin Kaistha, IIT Kanpur. The detail of the workshop can be found below. The workshop will take place on 13 January 2019 from 9:00-17:00 at Faculty of Engineering, Chulalongkorn University. There will be no cost but registration is required and the number of seats is limited. We encourage students and professors in the field to participate.


If you are interested in, please reserve the seat directly to Prof.Soorathep Khaewhom via  "This email address is being protected from spambots. You need JavaScript enabled to view it.".


Title: Economic process control

Professor Sigurd Skogestad, NTNU
Professor Nitin Kaistha, IIT Kanpur (case studies)


This workshop focuses on the big picture when designing a control system for process plants.
The overall objectives is to maximize the operational profit. This should also be the basis for designing the control system, all the way from PID controllers at the bottom of the control hierarchy to the possible RTO layer at the top.


Session 1. Overview of economic plantwide control
- Control degrees of freedom
- Our paradigm: Hierarchical decision (control) layer
- What is optimal operation?
- Distillation examples

Session 2. What to control? (Selection of primary controlled variables based on economics)
- Degrees of freedom
- Optimization
- Active constraints
- Self-optimizing control

Session 3. Where to set the production rate and bottleneck
- Inventory control
- Consistency
- Radiation rule
- Location of throughput manipulator (TPM)

Session 4. Design of the regulatory control layer ("what more should we control")
- PID control, Stabilization
- Secondary controlled variables (measurements)
- Pairing with inputs

Session 5 Design of supervisory control layer
- Cascade control
- Switching between active constraints
- MV saturation (SIMO controllers) : Split range control / Controllers with different setpoints
- CV changes: Selectors
- Decentralized versus centralized (MPC)

Session 6. Real-time optimization
Alternative implementations:
- Conventional RTO
- Dynamic RTO / Economic MPC
- Combination with Self-optimizing control
- Extremum seeking control / NCO tracking / Hill climbing

Session 7 (throughout the day)
- Case studies using Hysys