A Three-Phase Asymmetric Multilevel Inverter for Standalone PV Systems

This paper presents an asymmetric cascaded H-bridge multilevel inverter for photovoltaic system. The asymmetric multilevel inverter is perfect solution for photovoltaic system because it enhances power quality and enable transformerless operation. In an asymmetric cascaded H-bridge multilevel inverter, different levels of voltage is applied which enhance output voltage levels and reduces Total Harmonic Distortion (THD) as compared to symmetrical multilevel inverter. Two different carrier based modulation techniques are used for providing gate pulses to cascaded H-bridge multilevel inverter. A comparative analysis of two modulation techniques is also carried out in terms of THD. To validate the performance of an asymmetric cascaded H-bridge multilevel inverter for a photovoltaic system, the modeling is carried out using MATLAB/simulink. The result verifies the advantages and reliability of asymmetric cascaded H-bridge multilevel inverter for a PV system.