PUBLICATIONS

To improve the efficiency of the photovoltaic (PV) system using the three-level inverter, PV modules are separately connected to the

DC-links. However, in this connection, the output current distortion can be caused by the unbalanced neutral-point voltage. Then,

total efficiency is decreased. This paper proposes a high-efficiency switching strategy and a method for the neutral-point voltage

control for a single-phase three-level inverter. In the single-phase three-level inverter, this switching method increases efficiency by

reducing switch loss. In addition, the proposed method is implemented by changing space vector and modifying the reference

voltages to control the neutral-point voltage. As a result, efficiency of the PV system is increased. The proposed method is proven

by the simulation results.