Design an asymmetrical 49-level inverter fed by battery and PV energy sources

This study investigates the design and performance of an asymmetrical 49-level cascaded inverter specifically developed for renewable energy applications. The inverter's operation is analyzed under three distinct scenarios: utilizing DC battery sources configured in a per-unit voltage ratio (1:2:7:14), employing DC batteries with actual voltage levels (40:80:280:560 V), and replacing the DC sources with photovoltaic (PV) modules. The simulation results demonstrate the inverter's exceptional capability to produce high-quality sinusoidal output voltage and current waveforms with significantly low harmonic distortion. In the per-unit voltage configuration, the inverter achieves an RMS voltage ( V o RMS ) of 16.9719V and an RMS current ( I o RMS ) of 1.0569A, with a total harmonic distortion of 0.71216 % for voltage (THD V o ) and 0.093319 % for current (THD I o ). When configured with actual voltage levels, the system delivers V o RMS = 679.0492V and I o RMS = 4.265A, with THD V o of 0.71227 % and THD I o of 0.16719 %. With PV modules system, the inverter achieves V o RMS = 692.7293V and I o RMS = 43.1367A, and the THD values for output voltage and current were 1.2926 % and 0.33963 %, respectively. These results highlight the inverter's versatility and efficiency in providing high-quality power output while maintaining minimal harmonic distortion, making it a promising solution for modern renewable energy systems and industrial applications.