Single‐phase Modified T‐type–based multilevel inverter with reduced number of power electronic devices

Abstract

In this research work, a generalized structure of multilevel topology is proposed that can be extended by cascading the modules. Proposed modular topology is modified T-type structure that requires comparative reduced number of power components than other existing structures of multilevel inverter. Each module encompasses of three DC sources and 10 power switches. Both positive and negative voltage levels can be generated without the use of H-bridge inverter; thus, lower voltage rating power switches are employed for proposed modular topology. To generate the output voltage levels, the nearest level control is implemented on the experimental setup using dSPACE 1103 controller. To verify the performance of the proposed inverter, experimental validation of various topologies based on different algorithms is performed to generate 15-level, 17-level, 27-level, and 31-level at different load conditions. Moreover, different state-of-art topologies are compared with proposed topology in terms of the required number of voltage levels, DC sources, power switches, driver circuits, and total standing voltage.