Robust digital deadbeat control design technique for 3 phase VSI with disturbance observer

Abstract

A novel technique for an optimized deadbeat controller, having higher convergence rate for certain disturbances and capability to maintain the system stability, rapid response and extinction of errors, is presented in this paper. This control law is stimulated with integral control for tracking the reference signals. Moreover, the deadbeat controller is proposed with a state estimator and a disturbance observer for estimating the next sampling interval and to maintain the robustness along with rapid dynamic as well as static response in case of load uncertainty or unpredicted disturbance. The proposed technique is found relatively more effective than the conventional controller and previously designed deadbeat controllers due to its properly designed parameters, as discussed through simulation and by loop experiments in real time hardware assessments.