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Advanced Regulatory Control by David W. Spitzer

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Feedforward Control

Feedforward control is often used in conjunction with feedback control to adjust a controller set point or controller output in response to the change in a related process measurement before the effect of the process change is measured by the controller process variable measurement instrument. The intent of feedforward control is to achieve better control of the process variable by having the control system respond to measured disturbances prior to the effect of the disturbance being measured at the controller’s process variable input, thereby reducing the impact of the disturbance on the process variable and, hence, reduce the effect of the disturbance on the process.

Pure feedforward control produces an open-loop response ...

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