Process Control: Modeling, Design, and Simulation

M10.5. Summary

For surge vessels it is generally more important to allow levels to “float” in order to minimize flow rate variations. The approach shown in this module uses a gain that is proportional to the absolute value of the error; this is effectively a nonlinear controller, where the control action is a function of the square of the error. Nonlinear control was shown to lead to reduced control action compared with simple P-only control.