An Asymmetric Multi-Level Inverter Structure with Increased Steps per Devices

This paper suggests an improved basic single-phase 35-level inverter unit that consists of 4 DC power supplies, 4 capacitors, 10 switch/diodes and 10 gate driver circuits. The basic unit employs two DC links constructed by two cascaded capacitors in parallel with
$V_{L}$
and
$V_{R}$
DC sources. The use of capacitors not only has led to increased levels, but also has reduced the DC sources and converter cost. The voltage balancing of capacitors is done naturally which eases the control of proposed topology. Since, the proposed structure is based on developed H-bridge, it can produce positive, zero and negative voltage steps. Also, the suggested topology has suitable performance for resistive (
$R$
) or resistive-inductive (
$R-L$
) load types. Based on comparison results, the suggested structure has more steps per devices than similar configurations. The credits of suggested topology have been certified by comparisons and simulations in PSCAD/EMTDC software.