Derivative control action is designed when the process variable has a
tendency to change rapidly. Hence an enhanced and immediate control action is
needed with respect to rate of change. It needs careful application as improper
tuning may result in process swinging out of control. Dynamic compensation
action is designed to aid the control action, by the influence of other
parameters (not controller PV), which may recognise the anticipated variation
of controlled PV.The controller response needed may required to be varied under
different conditions and hence typically Feedforward control concepts are used
for dynamic compensation.
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