Improved Pulse-Width Modulation Technique for 11-level Series-Parallel Switched Hybrid Inverter

In this paper, improved Pulse-Width Modulation technique for an 11-level series-parallel switched Hybrid Inverter is presented. The series-parallel switching of the inverter bridge reduces the switching devices used for the same output voltage level as compared to traditional topologies. The hybrid modulation technique used is further separated as continuous and discontinuous. Results of both the modulation techniques are compared on the basis of their harmonic performance, which is measured in terms of total harmonic distortion and weighted total harmonic distortion. Discontinuous hybrid modulation is proved to be harmonically superior to its continuous counterpart. The validity of the proposed scheme is verified through simulated and experimental results.