Implementation of Modified Five-Level Inverter Using a Reduced Number of Switches

摘要

In this paper, a single-phase modified five-level unsymmetrical CHB inverter with six switches and two dc sources has been presented. The major advantages of this type of topology in contrary to conventional topologies are reduced number of devices and simple control. This reduction in switches has lowered the size, complexity, cost, and losses, very low ripple current can be present, resulting in a volume reduction of a filter. If switching frequency is higher, which increased the switching losses, but the resulting reduction in THD has immensely improved the inverter performance. As a result, increased switching losses can be neglected safely. The simulated results are validated on the experimental setup and found correct. The validation is tested on a 70 W prototype which was designed and built, and check prototype with an induction motor type load. In the future, this work can be expanded to focus on applying this design in a real-life standalone, grid-connected PV system, and industries in the field of low-voltage and high-power applications.