Novel Single-Phase Packed U-Cell based Symmetrical Multilevel Inverters

Abstract

This paper presents a packed U-Cell based symmetrical multilevel inverters for grid-connected Photovoltaic (PV) systems. The proposed MLI can raise the number of levels in the output voltage with reduced power electronic devices compared with the popular MLI structures. The level-shifted sinusoidal pulse width modulation technique is employed to generate the triggering pulses. In addition, the proposed MLI has the ability to operate during the non-unity power factor conditions without any limitations. Furthermore, the proposed topologies are tested for 9-Level generation under different loading conditions. Moreover, a comparison with the modern MLI topologies is presented in terms of device count to show the merits of the proposed MLI. MATLAB/Simulink toolbox is used to validate the performance of the proposed MLI under different loading conditions.