Current Control of a Seven-Level Voltage Source Inverter

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Abstract
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 PWM blocks, and PI controllers, which is the advantage of MPC in Power electronics applications. In order to evaluate the performance of the seven-level topology and the developed control method effectiveness, experimental results have been done for different conditions, which demonstrates the feasibility of the 7-level topology and the developed control technique.
Funding Information
  • Natural Sciences and Engineering Research Council of Canada
  • CONICYT/FONDECYT (11180233)
  • AC3E CONICYT-Basal Project (FB0008)

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