Course IIA1117 Control Engineering Fall 2017 Cascade control

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Presentation transcript:

By Finn Aakre Haugen (finn.haugen@usn.no) Course IIA1117 Control Engineering Fall 2017 Cascade control By Finn Aakre Haugen (finn.haugen@usn.no) USN. IIA1117 Control Engineering. Haugen. 2017

Faster (more effective) compensation of process disturbances. Benefit of cascade control (comparing with ordinary single loop control): Faster (more effective) compensation of process disturbances. USN. IIA1117 Control Engineering. Haugen. 2017

Review: Single-loop control system 3 Review: Single-loop control system USN. IIA1117 Control Engineering. Haugen. 2017

Cascade control system 4 Improved structure with faster (more effective) disturbance compensation: Cascade control system USN. IIA1117 Control Engineering. Haugen. 2017

Interpretation: With cascade control, the original actuator is substituted by a "new" well-behaving" actuator: USN. IIA1117 Control Engineering. Haugen. 2017

USN. IIA1117 Control Engineering. Haugen. 2017 Controller tuning: First, tune the secondary controller (with the primary controller in Manual mode). Then, tune the primary controller (with the secondary controller in Auto mode). USN. IIA1117 Control Engineering. Haugen. 2017

Example 1: Cascade control of temperature in a vessel 7 Simulator (unzip all the files, and then run the exefile). USN. IIA1117 Control Engineering. Haugen. 2017

Which of the control structures is the best? Example 1 cont.: Comparing performance indexes IAE (Integral of Absolute value of control Error): Excitation Single-loop Cascade Their ratio (Sprang = step) (Forstyrrelse = disturbance) Which of the control structures is the best? USN. IIA1117 Control Engineering. Haugen. 2017

Example 2: Cascade control of heat exchanger Simulator USN. IIA1117 Control Engineering. Haugen. 2017