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Volume 55 Issue 2
Mar.  2020
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Article Contents
Journal of Southwest Jiaotong University  > 2020  >  55(2): 450-458.
YU Bin, SONG Wensheng, ZHAO Leiting, JIANG Wei, FENG Xiaoyun. Switching Scheme of Multi-mode Modulation Based on Selected Harmonic Elimination Pulse Width Modulation[J]. Journal of Southwest Jiaotong University, 2020, 55(2): 450-458. doi: 10.3969/j.issn.0258-2724.20180148
Citation: YU Bin, SONG Wensheng, ZHAO Leiting, JIANG Wei, FENG Xiaoyun. Switching Scheme of Multi-mode Modulation Based on Selected Harmonic Elimination Pulse Width Modulation[J]. Journal of Southwest Jiaotong University, 2020, 55(2): 450-458. doi: 10.3969/j.issn.0258-2724.20180148
shu

Switching Scheme of Multi-mode Modulation Based on Selected Harmonic Elimination Pulse Width Modulation

doi: 10.3969/j.issn.0258-2724.20180148
  • Received Date: 22 Mar 2018
  • Rev Recd Date: 10 Oct 2018
    • Available Online: 15 Oct 2018
  • Publish Date: 01 Apr 2020
    Abstract
  • In order to suppress the current and torque shock, a switching scheme of multi-mode modulation based on selected harmonic elimination pulse width modulation (SHEPWM) was proposed. Based on the basic principle of SHEPWM, the spectrum of phase voltage was analyzed. The relationship between current harmonics and modulation index was acquired with different switching angle numbers. Then, the switching process was abstracted as the first-order transient response of the fundamental circuit and harmonics circuits, and the mathematic model of the switching process was built. The mechanism of current shock during switching process was analyzed. Hardware-in-loop (HIL) experiments of two switching schemes were carried out on the RT-LAB HIL experimental platform. The results indicate that the main cause of the torque shock is the harmonic current amplitude step change during the switching process, and the harmonic currents amplitude keeps constant when switching at π/2 or 3π/2, so the phase current switches smoothly. The three phase currents can’t satisfy the phase requirement at the same time, so each phase switching at π/2 or 3π/2 separately can suppress the current and torque shock effectively.

     

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