Demanding higher power, higher power quality, lower switching loss, and eliminating interface transformers in industrial applications caused significant attention toward multilevel converters. This paper presents current control of a seven-level topology for medium-voltage high-power applications. This topology has fewer active switches and components, and less control complexity in comparison to the other existing classic and advanced seven-level topologies. A comprehensive review has been done on seven-level topologies to demonstrate the advantages of this topology in this paper. A control method based on model predictive control (MPC) is developed to balance the flying capacitors of this topology at their desired values and control the output currents without the need of pulsewidth modulation blocks, and proportional-integral (PI) controllers, which is the advantage of MPC in power electronics applications.
A. Bahrami, M. Narimani, M. Norambuena and J. Rodriguez, “Current Control of a Seven-Level Voltage Source Inverter,” in IEEE Transactions on Power Electronics, vol. 35, no. 3, pp. 2308-2316, March 2020, doi: 10.1109/TPEL.2019.2926174.