Design and realization of a multi-objective controller for a MIMO coupled tank system

This paper presents a design of multi-objective controller for a two input two output interacting Coupled Tank System (CTS) and its real time implementation. The multi-objective control has been achieved by satisfying time domain objective like pole placement and frequency domain objective like H-infinity condition. This multi-objective control has been formulated using Linear Matrix Inequality (LMI) criteria and solved as a convex optimization problem. The multi-objective controller gain thus computed has been implemented in real time dSPACE hardware platform with a laboratory scale process. The resulting controller yields improved performance of the closed loop system for reference tracking with robustness in presence of parameter variation and various uncertainties.