To avoid short circuit of dc sources, the separated dc source configuration is
applied to the multilevel inverter using cascaded-inverter. This section will discuss about
why cascaded inverter have to employ the separated dc sources (SDCSs). To explain this,
two possible dc sources connections are assumed. In the first case, all H-bridge cells in
the same leg share the same dc source. Another connection is that the same dc source is
shared in the same level of each phase. Fig. 2.8(a) and 2.8(b) illustrate the first
connection and the second connection of five-level cascaded inverter, respectively.