Mathematical approach to THD optimisation in multilevel convertors.

Authors

  • A. Jan Iwaszkiewicz The Electrotechnical Institute, Gdansk Branch, Poland Author
  • B. Jacek Perz The Electrotechnical Institute, Gdansk Branch, Poland Author

DOI:

https://doi.org/10.24084/repqj04.449

Keywords:

THD, harmonics, multilevel converter, converter control, modulation strategy, power quality, waveform synthesis

Abstract

The paper is related to the problem of generating the high qual-ity  AC  voltage  waveforms  using  multilevel  converters.  This  technique  can  be  applied  especially  in  the  distributed  power  energy systems with renewable DC voltage sources like photo-voltaic  farms  and  fuel  cells.  A  novel  approach  to  the  synthesis  of  AC  voltage  waveforms,  considering  minimising  of  THD  by  use  of  analytical  methods  like  Fourier  transform  is  presented.  The analysis of the obtained waveforms is presented as well as examples of chosen parameter optimisation. The meaning of the THD factor from the construction point of view is analysed and a  new  bandwidth  factor  THDB,  containing  more  information  about the frequency range of harmonic components is proposed in the paper.

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Published

2024-01-10

Issue

Vol. 4 No. 1 (2006)

Section

Articles