Process Control Basics: Feedforward and Closed Loop Control

Feedforward Control
Feedforward control is a control system that anticipates load disturbances and controls them before they can impact the process variable (PV). It is a form of open loop control, as the process variable is not used in the control action. In feedforward control the major process variables(A1, A2 & A3) are fed into a model to calculate the manipulated variable (MV) required to control at setpoint (SP). For feedforward control to work effectively, the user must have a mathematical understanding of how the manipulated variable(s) will impact the process variable(s)
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