Parameter Scheduling & Adaptive Control of Nonlinear Processes

Parameter Scheduling and Adaptive Control of Nonlinear Processes -

Processes with streams comprised of gases, liquids, powders, slurries and
melts tend to exhibit changing (or nonlinear) process behavior as operating
level changes. As we explore in this article, processes that are nonlinear
with operating level will experience a degrading controller performance
whenever the measured process variable (PV) moves away from the design
level of operation. We demonstrate this problem on the heat exchanger under
PI control. If we decide that a change in performance with operating level
is not acceptable for our application, then parameter scheduled adaptive
control may be the appropriate solution. Developing an adaptive control
strategy requires additional effort and expense. Before we start such a
project, we should be sure that the loop has sufficient impact on our
profitability to justify the investment.

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