Lecture Notes 39

Lecture 39 - Feedforward Control

Feedforward control is a strategy to reject persistent disturbances that cannot adequately be rejected with feedback control. So far, most of the focus of this course has been on feedback control. In certain situations, the performance of control systems can be enhanced greatly by the application of feedforward control. What you need to look for are two key characteristics:

An identifiable disturbance is affecting significantly the measured variable, in spite of the attempts of a feedback control system to regulate these effects
This disturbance can be measured, perhaps with the addition of instrumentation