Elimination/Mitigation of Output Voltage Harmonics for Multilevel Converters Operated at Fundamental Switching Frequency using Matlab's Genetic Algorithm Optimization
Paper in proceeding, 2020

This paper deals with the optimization of the output voltage waveform of a multilevel converter operated with fundamental frequency switching. For a high number of output voltage levels, nearest-level control is typically used, whereas an optimized waveform can be presumably used to eliminate a selection of low order harmonics. A nonlinear optimization problem for any kind of multilevel inverter, operating in a single or three-phase arrangement, is formulated. It is shown that the set of nonlinear equations, defining this optimization problem, cannot be numerically solved, if the number of output voltage levels is higher than nine. Thus, an optimization algorithm, e.g., Matlab's genetic algorithm, should be used instead. Based on the concept of the weighted THD, it is shown that an optimized waveform has no effect on the output current's quality of a single phase multilevel converter. However, considering an ungrounded three-phase system, the content of the to be eliminated harmonic components is shifted towards the triplen harmonics and, consequently, the expected current quality, based on the WTHD, can be significantly improved.

Battery

Multilevel system

Switching losses

IGBT

MOSFET

Efficiency

Multilevel converter

Electric vehicle

H-bridge

Cascaded

Energy storage

Author

Anton Kersten

Chalmers, Electrical Engineering, Electric Power Engineering, Electrical Machines and Power Electronics

Manuel Kuder

University of the German Federal Armed Forces

Arthur Singer

STABL Energy GmbH

Weiji Han

Chalmers, Electrical Engineering, Systems and control, Automatic Control

Torbjörn Thiringer

Chalmers, Electrical Engineering, Electric Power Engineering, Electrical Machines and Power Electronics

Thomas Weyh

University of the German Federal Armed Forces

Richard Eckerle

University of the German Federal Armed Forces

2020 22ND EUROPEAN CONFERENCE ON POWER ELECTRONICS AND APPLICATIONS (EPE'20 ECCE EUROPE)

2325-0313 (ISSN)

22nd European Conference on Power Electronics and Applications (EPE ECCE Europe)
Virtual; online, France,

Subject Categories

Computational Mathematics

Control Engineering

Other Electrical Engineering, Electronic Engineering, Information Engineering

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5/6/2021 1