DeadBeat Controller Based Luenberger Current Observer for Single-phase Islanded Inverter

Abstract

The control of a DC/AC converter to provide a cost sinusoidal wave required in many application, is a challenging task. In the present paper, the deadbeat control algorithm has been proposed to generate a nearly sinusoidal waveform with zero steady-state error and low total harmonic distortion (THD). The controller is based on the output measurements to generate the required modulating signal (pulse-width), for controlling a single phase inverter. The derived deadbeat control algorithm requires the measurement of both capacitor current and output voltage which can be considered as a costly system. To tackle this disadvantage, we propose an estimation of the capacitor current based on Luenberger observer. The simulation results have confirmed the validity of the deadbeat control based current observer to enhance the output voltage, in the linear and nonlinear loads.