As per eq. (2) of Section-III (Inverter Design) of 'Comparison of Hard-Switched Multi-Level Inverter Topologies for STATCOM by Loss Implemented Simulation and Cost Estimation' by K. Fujii, U. Schwarzer and R.W.DDoncker, maximum modulation factor is 1.104 and modulation index is determined by minimum on-time and dead-time.
I am unable to understand how the factor 1.104 will appear and how modulation index depends upon minimum on-time and dead-time.
Please guide me with relevant documents.