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Part IV : Enhancements to Single-Loop PID Feedback Control.

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Presentation on theme: "Part IV : Enhancements to Single-Loop PID Feedback Control."— Presentation transcript:

1 Part IV : Enhancements to Single-Loop PID Feedback Control

2 @ Control enhancements are chosen based on the following criteria: Reinforce principles: ‘strong’ control theory Demonstrate practice Apply process insight: understanding of process equipment and operating conditions

3 Chapter 14 Cascade Cascade design criteria Cascade uses an additional measurement of a process variable to assist in the control system

4 Ex. Stirred-tank heat exchanger with cascade control

5 S1. Cascade control is superior to single-loop control

6 S2. Cascade controller S3. Two controller names

7 S4. Block diagram

8

9 @ Rejection of stochastic secondary disturbance Cascade control

10  Cascade examples 1. Packed-bed reactor

11 2. Heater exchanger 3. Pressure control

12 4. Jacketed CSTR

13 @ Distributed decision making by cascade structure


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