feedforward_control

feedforward_control - Feedforward Control 1 Introduction 2...

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Unformatted text preview: Feedforward Control 1. Introduction 2. Ratio control 3. Controller design based on steady- state models 4. Controller design based on dynamic models 5. Feedback-feedforward control 6. Simulink example Feedback Control ● Advantages » Corrective action taken regardless of disturbance source » Minimal process information required for controller design » PID control is very versatile and usually effective ● Disadvantages » Corrective action not taken until after the output has deviated from the setpoint » Requires measurement of the controlled output » Does not allows measured disturbances to be utilized » Problematic for processes with large time constants and/or long time delays Feedforward Control ● Major disturbance is measured and used as the controller input ● Advantage » Corrective action can be taken before the output has deviated from the setpoint » Particularly useful for processes with large time constants and/or long time delays ● Disadvantages » Disturbance must be measured » Provides no advantages for other disturbances » Typically requires a process model Boiler Drum Level Control Ratio Control ● Objective is to maintain the ratio of two stream flow rates at a desired value: » u is the manipulated flow rate » d is the measured disturbance flow rate...
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This document was uploaded on 02/04/2012.

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feedforward_control - Feedforward Control 1 Introduction 2...

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