Novel single-phase five-level inverter utilizing digital counter control scheme

Abstract

A novel single-phase digital control circuit-based five level inverter (FLI) is presented in this paper. Based on the determined switching angle, one switching cycle of the inverter is divided into segments from which the switching sequence of the inverter switches is digitized. A programmed counter built around J − K flip flops with logic gates provided the needed switching signals for the H -bridge inverter. Proposed inverter is verified through simulation in a MATLAB/SIMULINK environment and simulation results are given. Simulation results show notable reduction in total harmonic distortion (THD) in the inverter output voltage and load current. With an RL load (of 200 Ω and 0.250 H), a single digit THD of 8.5 1% for the inverter load current is realized. Comparison of the novel control circuit-dependent FLI with the conventional and contemporary power-circuit-dependent cascaded H -bridge inverter (CHBI) show that the novel FLI is synthesized with lesser number of power circuit and control circuit components.

Comparative analysis of switching angle calculation methods for multilevel inverters

“…In modular multilevel inverters the number of levels in output QSW changes with the addition or removal of the modules, the features and advantages mentioned above make the SAC methods more suitable for calculation of new switching angles 61 . Therefore, the SAC methods are more attractive compared to other fundamental frequency methods and are widely used 62‐81 …”

Analysis, design and simulation of digital controlled symmetrical seven levels inverter

“…This also requires a rectifier circuit which is widely known to be a source of harmonics. It is quite anticipated that a given level of MLI realized with few H-bridge cells through control circuit based design [15] will result in compact system with greater efficiency and reliability compared to realizing the same level of MLI with same number of H-bridge cells but with additional auxiliary power circuit components or achieving the same level of output voltage with greater number of H-bridge cells.…”