تصميم التحكم متعدد الدوائر على أساس تحليل حساسية الحالة المستقرة

Abstract

ABSTRACT

This paper proposes multi-loop control for multivariable distillation processes using analytical design method, based on steady state sensitivity analysis. The design method is aimed to select the best controller pairings for multi-input multi-output (MIMO) processes containing integrators process. Essentially, for keeping the purity of benzene in the top product and impurity in the bottom: under acceptable specification, eliminating the process interaction, and operate the column in safety condition. This method requires step change in the manipulated variables of open loops. The steady state sensitivity of controlled variables to changes in the manipulated variables is analyzed using the relative gains array (RGA). The multi-loops were tuned independently based on the process distinctive behaviours using Ziegler-Nichols and modified Ziegler-Nichols rules to determine the controller gains. The candidate input-output parings are identified and then investigated using simulation and dynamic analysis. The results demonstrate that LV-configuration provided the superior robust performance with fast and well-balanced closed-loop stability for large load disturbances in feed flow rate and feed composition.
Keywords: (Steady state sensitivity analysis, distillation column, control design, relative gains array)