A novel advanced controller for robust stability of high order plants with time-delay and uncertainty

Abstract

This paper introduces a new graphical design method for obtaining the full range of advanced PID control gains that robustly stabilize a system in the presence of time delays and additive uncertainty. This proposed design method primarily depends on the frequency response of the system, which proves effective to reduce the complexities involved in plant modelling and identification. The fact that time-delays and parametric uncertainties are almost always present in real time processes makes this proposed controller design method very promising for process control. For testing, this new design method was applied to control a DC motor system with a communication delay. The simulation results were satisfactory and the robust stability was achieved for this perturbed plant.