Split-Capacitor Five-Level Transformerless Grid Connected Single Phase PV System using Level Shifted PWM Technique

Abstract

This paper proposes Level shifted Pulse Width Modulation (PWM) methods for single phase transformerless Multi Level Inverter (MLI). Many of the existing topologies have high variations in Common Mode Voltage (CMV) and high leakage current. The proposed topology with level shifted PWM technique for five level single phase MLI, reduces the variations in CMV, minimizes the leakage current according to VDE0126-1-1 standard and the reduced number of switches makes the losses less than the conventional topologies. This topology reduces the current THD. Finally, simulations are carried in MATLAB/Simulink for different inverter topologies.