MIMO Systems: Decentralized control

Advanced Modeling and Control

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MIMO Systems: Decentralized control Advanced Modeling and Control

MIMO Systems: Decentralized control
Multivariable process plants
Methods of controlling process plant
Decentralized Control vs. Centralized Control Systems
Issues in decentralized control system
Decentralized PID Control Design Methods
Decoupling controllers
Plantwide Control Hierarchy
Plantwide Control Design Flowchart
Plantwide Control Design Tasks
Operating Objectives
2x2 MIMO Process System
2x2 real process example – distillation column
Controller Pairings
Multi‐Loop Controllers (Decentralized Control)
Multi‐Loop Controllers – Distillation Column
Coupling Effect of Loop 2 on y_1
Multi‐Loop Controllers – Distillation Column
Stead‐State Coupling – Relative Gain Array (RGA)
Relative Gain Array – Coupling Effect
RGA Calculation
Example of RGA calculation and pairings – 2x2 MIMO
Example of RGA calculation and pairing – 3x3 MIMO
RGA Analysis
Example of Impact of Different Dynamic Behaviors
Direct Pairing (Thin Line) and Reverse Pairing (Thick Line)
Dynamic RGA
Pairing Considerations
Sensitivity to Disturbances
Example ‐ Configuration Selection for a C3 Splitter
(L,V) Configuration Applied to the C3 Splitter
Reflux Ratio Applied to the Overhead of the C3 Splitter
Other Configurations
Configuration Selection of C3 splitter
Control Performance
Analysis of Configuration Selection Example
One‐Way Decoupler
Multi‐Loop (Decentralized) PID Controller Design
Detuning Method
Example 2x2 MIMO – Wood and Berry (WB) Column
Multi ‐loop PID Controllers for WB Column – Detuning Method
Detuning method example
Sequential Loop Closing
Multi‐loop PID Controllers for WB Column – Sequential Loop Closing Method
Sequential Loop Closing example
Sequential Loop Closing (SQL) example…
Independent Tuning Method
Multi ‐loop PID Controllers for WB Column – Independent Tuning Method
Independent Tuning Method example
Simultaneous Dimensionless Parameter (SDP) Tuning
SDP Tuning Example – WB Column
Decoupling Control: One‐Way Decoupling
Decoupler Design
Two‐Way Decoupling System
Examples of Decoupling Control
Simulation Example
Simulation Example
Simulation Example: 1‐way decoupler D_{12}
Simulation Example: 1‐way decoupler D_{21}
Simulation Example: 2‐way decoupling control (D_{12} and D_{21})
Summary