Not all systems are compatible with a PID controller. Simple methods can maximize the control performance in nonlinear systems.
The chemical process industries (CPI) rely on controllers to ensure stability and quality. Simple processes typically follow a linear model and are easily controlled with a common proportional-integral-derivative (PID) controller. However, the nonlinearity of many processes makes control by conventional methods extremely challenging.
This article discusses several nonlinear control techniques that can improve feedback control — such as error-squared gain and various types of linearization — and demonstrates how these methods can be applied to a common nonlinear control application, pH control.
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