Hybrid modulation technique for binary asymmetrical cascaded multilevel inverter for PV application

Performance of a binary asymmetrical cascaded H-bridge (CHB) inverter using two H-bridges is investigated in this paper. A modified hybrid modulation technique is implemented where one bridge operates at fundamental switching frequency and handles most of the power. The 2nd bridge operates at a higher switching frequency to generate a desired sinusoidal waveform at the output. Thus, the H-bridges of CHB inverter operate at different voltage levels and at different frequencies. This allows the performance to be optimized. Simulation and experimental results are produced to prove the usefulness of the proposed system configuration. A possible application in solar PV system is reported.