Flexible cascaded multilevel inverter with multiple operation modes

Abstract

In this paper, a flexible cascaded multilevel inverter is proposed with a wide operational range. The inverter can change its topology structure to operate in three modes by a bidirectional switch unit. The nine-level or five-level mode of the inverter is adopted to optimize the output waveform when the input power is low. To decrease power losses, the three-level mode of the inverter is adopted to reduce the number of active switch devices when the input power is high. The topology and modulation strategy of the proposed inverter are presented and analyzed. The total losses and current THD of the inverter are calculated. In addition, simulations and experiments are conducted. The obtained simulation and experimental results indicate the correctness and feasibility of the proposed inverter and its modulation strategy.

Simulation design and analysis 9-level H-bridge single phase stepdown cyclo inverter

“…The more the number of levels, the MLI output waveform is closer to the sinusoid so that it will decrease the THD. However, this increase in voltage level is accompanied by disadvantages, among others, that this inverter requires a larger number of switches, a more complicated control system, and a higher cost [3]. MLI can be built using a combination of power semiconductor devices such as MOSFET, and IGBT where the MLI voltage format is in the form of a step-step voltage wave pattern resulting from a predetermined gate switch sequence setting [4], [5].…”

Cascaded full‐bridge resonant inverter configuration for different material vessel induction cooking

“…In the literature, cascaded multi-level inverter topologies [26][27][28][29][30][31][32] are proposed for different applications like photovoltaic, AC power distribution and industrial applications. In these configurations, cascaded bridges are operated at single frequency to supply single load.…”