cascade_control

cascade_control - Cascade Control 1. 2. 3. 4. 5....

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Cascade Control 1. Introduction 2. Process examples 3. Closed-loop analysis 4. Controller design 5. Simulink example
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Introduction Feedback control » Corrective action taken regardless of disturbance source » Corrective action not taken until after the output has deviated from the setpoint » Problematic for processes with large time constants and/or long time delays Feedforward control » Corrective action can be taken before the output has deviated from the setpoint » Disturbance must be explicitly measured » Typically requires a process model
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Cascade Control Cascade control can provide improved performance for unmeasured disturbances Basic characteristics » A second measurement and a second controller are used in an inner feedback loop » The setpoint for the inner control loop is provided by an outer control loop designed to regulate the controlled output » The disturbance can be more rapidly identified with the secondary measurement than with the primary measurement Particularly useful when the disturbance is associated with the manipulated input
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Flow Control Example Control problem » Regulate flow rate through control value despite changes in upstream and/or downstream pressures Control alternatives » Specify the value position to indirectly achieve the desired flow rate » Utilize a measurement of the flow rate to design a feedback controller that explicitly regulates the flow rate Applications » Any control problem in
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cascade_control - Cascade Control 1. 2. 3. 4. 5....

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