A Robust Fuzzy-based Control Technique for Grid-Connected Operation of Sensor-Less PUC5 Inverter

This paper presents a robust fuzzy-based control strategy for single-phase five-level PUC5 inverter in grid-connected mode that can properly improve the grid power quality. The proposed control technique is able to provide unity power factor between grid voltage and current by accurately injecting the needed load currents in presence of unmolded uncertainties. To provide robust property, the proposed fuzzy-based control strategy for accurate operation of PUC5 in grid-connected conditions has been designed. Simulation results in MATLAB software verify the proposed control technique abilities at achieving very low THD grid current, unity power factor, appropriate output voltage and SPWM reference signal.