Modified H-bridge multilevel inverter for Photovoltaic micro-grid systems

A modified multilevel inverter (MLI) structure has been presented for Photovoltaic (PV) fed 2.3 kV micro-grid applications. To feed the cascaded multilevel micro-grid connected inverter (CM-MGCI) voltage, a PV array is designed considering the environmental effects of Bangladesh. We have estimated the performance of the classical and a modified cascaded H-bridge (CHB) MLI with level-shifted carrier sinusoidal pulse width modulation (LSC-SPWM) technique in MATLAB/Simulink environment. The voltage and total harmonic distortion (THD) profile for the proposed eleven-level modified H-bridge MLI topology has been compared with the conventional CHB topology. The harmonic profile has also been compared with other modified MLI topologies. Compared to the conventional CHB and other recent modified MLI topologies, the proposed H-bridge CM-MGCI shows better THD profile.