Cascaded Transformers-Based Multilevel Inverters With NPC

A new single‐phase multilevel inverter with improved modulation technique

“…Recent past several structures for TMLI have been presented. [19][20][21][22][23][24][25] The key benefits of these TMLIs are to minimize the number of transformers, sources, and switches. Later topology in Gandomi et al 12 is suggested in high voltage and renewable energy applications.…”

“…The circuits in previous studies 14,15,18 are capable of working in asymmetric and symmetric arrangements and need eight switches and a single transformer for a 9L load voltage. Moreover, previous works 20,21 introduced CHB with single-phase transformers for 13-level load voltage. This construction offers less source count to generate large levels for active filter and grid-connected systems.…”

“…The resultant fundamental voltage of the suggested inverter for various modulation indices is estimated from (21).…”

“…To assess the benefits of the suggested 17L topology, a comparative examination was conducted between the presented structure and the recent existing transformer-based topologies. 12,[14][15][16][17][18][19][20][21][22][23][24][25]27 The outline of the comparison results is enrolled in Table 4. To make a sufficient examination between the inverter topologies with various voltage levels, the ratio of N s , N dr , N t , N dd , N c , and N dc over N l was utilized.…”

“…Furthermore, the suggested 17L inverter generates more voltage levels per device than topologies in previous studies. 12,[14][15][16][17][18][19][20][21][22][23][24][25] Further, the concern of total blocking voltages (TBV) is another aspect that is taken into consideration in the comparison. Blocking voltage is closely related to the size and cost of switches and ensuring that a switch has minimal overall blocking voltage means that the switch will have the smallest possible size and lowest cost.…”