Control Solutions for Level Processes

Classical control theory offers a range of control solutions for industrial processes, which provides different conventional controller structures (PID) and empirical, analytical, and optimization-based tuning criteria. This paper presents the principles of obtaining the transfer functions of a system with two coupled tanks, followed by a proposal for a two-loop control scheme (P and PI). For tuning the controllers’ parameters, the pole placement method in the complex plane is used. Additionally, root locus analysis is performed to determine the range of variation for a parameter to maintain the desired performance. The calculations and the closed-loop system simulation were performed using the Matlab/Simulink environment.