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**Topic under **Control Mode

**Source:** www.chemengr.ucsb.edu

**File size:** **427.49 KB**

**File type:** **pdf**

**Last download on:**
Tue Apr 10, 2018 06:23:53 AM

__Short Desciption__:

PI/PID Controller Design Based on Direct Synthesis and Disturbance Rejection Dan ChenandDale E. Seborg* Department of Chemical Engineering, University of California, Santa Barbara ...

__Summary__:

A design method for PID controllers based on the direct synthesis approach and specification of
the desired closed-loop transfer function for disturbances is proposed. Analytical expressions
for PID controllers are derived for several common types of process models, including firstorder
and second-order plus time delay models and an integrator plus time delay model. Although
the controllers are designed for disturbance rejection, the set-point responses are usually
satisfactory and can be tuned independently via a set-point weighting factor. Nine simulation
examples demonstrate that the proposed design method results in very good control for a wide
variety of processes including those with integrating and/or nonminimum phase characteristics.
The simulations show that the proposed design method provides better disturbance rejection
than the standard direct synthesis and internal model control methods when the controllers
are tuned to have the same degree of robustness.

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