Analysis and Performance of Five-Phase Piecewise-Random-Switching-Frequency Space Vector Pulse Width Modulation

Feifei Bu, Qi Liu, Tianyu Pu, Yun Zhao, Beijia Ma, Conggan Ma, Michele Degano, Chris Gerada

Research output: Journal PublicationArticlepeer-review

10 Citations (Scopus)


In order to better address the problem of many high-order harmonics' concentration in the output voltage, a novel five-phase piecewise-random-switching-frequency space vector pulse width modulation (PRSF-SVPWM) strategy is proposed for a five-phase voltage source inverter. Compared to the conventional random switching frequency SVPWM (RSF-SVPWM), the entire fundamental period of this method is divided into two half-fundamental periods, so the original switching frequency in a single fundamental period is randomized in segments respectively. During this process, parameters named the offset frequency and random frequency are defined and assigned reasonably. In this way, high-frequency harmonics in one period are spread into a wider range. Subsequent simulation and experimental results verify that the proposed random modulation strategy can further reduce amplitudes of harmonics near switching frequency and its integer multiples, even though within a narrow switching frequency range, and a satisfactory effect of high-order harmonic dispersion is finally obtained, which contributes to the application and popularization of random pulse width modulation strategies.

Original languageEnglish
Article number9305224
Pages (from-to)2339-2347
Number of pages9
JournalIEEE Transactions on Energy Conversion
Issue number3
Publication statusPublished - Sept 2021


  • High-order harmonic dispersion
  • Random modulation strategy
  • Switching frequency

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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