ICAD based control of a pressure-level pilot plant

A practical example of multivariable control analysis and design for a pilot plant within Individual Channel Analysis and Design (ICAD) framework is presented. The pressure-level plant is used for studying the dynamics of variables like gas pressure and liquid level that often occur in the process industries. The device is very problematic since it is highly nonlinear and it is not diagonal dominant. High level noise is also present on both outputs while additional problem is non-repeatability of the dynamics. On the basis of the ICAD analysis, a simple low-order linear diagonal controller was designed that met the prescribed specifications.