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Energies 2019, 12(3), 524; https://doi.org/10.3390/en12030524

A New Modular Multilevel Inverter Based on Step-Up Switched-Capacitor Modules

1
Faculty of Electrical and Computer Engineering, Babol Noshirvani University of Technology, Mazandaran, P.O. Box 474, Babol 47148-71167, Iran
2
Faculty of Electrical and Computer Engineering, Semnan University, Semnan 35131-19111, Iran
3
Intelligent Electrical Power Grids at Department of Electrical Sustainable Energy, Delft University of Technology, 5031, 2600 GA Delft, The Netherlands
4
Department of Electrical Engineering and Automation, Aalto University, Maarintie 8, 02150 Espoo, Finland
*
Author to whom correspondence should be addressed.
Received: 3 January 2019 / Revised: 1 February 2019 / Accepted: 2 February 2019 / Published: 7 February 2019
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Abstract

A new structure of switched capacitor multilevel inverter (SCMLI) capable of voltage boosting and with self-balancing ability is introduced in this article. This advantage is the result of a step by step rise of capacitor voltages in each module, supplied by just one DC voltage source. The proposed topology generates a sinusoidal output waveform with a magnitude several times greater than the input one. Higher output staircase AC voltage is obtained by applying a nearest level control (NLC) modulation technique. The most significant features of this configuration can be mentioned as: fewer semiconductor devices, remarkably low total harmonic distortion (THD), desirable operating under high/low frequency, high efficiency, inherent bipolar voltage production, easy circuit expansion, ease of control and size reduction of the circuit thanks to utilizing neither bulky transformer nor inductor. Moreover, the proposed SCMLI is comprehensively surveyed through theoretical investigation and a comparison of its effectiveness to recent topologies. Eventually, the operating principle of a 25-level prototype of the suggested SCMLI is validated by simulation in the MATLAB SIMULINK environment and experimental results. View Full-Text
Keywords: multilevel inverter; single-source converter; switched-capacitor; step-up converter; self-balancing multilevel inverter; single-source converter; switched-capacitor; step-up converter; self-balancing
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Khodaparast, A.; Azimi, E.; Azimi, A.; Adabi, M.E.; Adabi, J.; Pouresmaeil, E. A New Modular Multilevel Inverter Based on Step-Up Switched-Capacitor Modules. Energies 2019, 12, 524.

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