The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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Performance Comparison of Common-Mode Voltage Reduction PWM Methods in Terms of Modulation Index

변조지수에 따른 공통모드 전압 저감 PWM 기법 성능 비교

  • Heo, Geon (Graduate School of Energy Convergence, Gwangju Institute of Science and Technology) ;
  • Park, Yongsoon (Graduate School of Energy Convergence, Gwangju Institute of Science and Technology)
  • Received : 2020.11.23
  • Accepted : 2021.01.15
  • Published : 2021.04.20
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Abstract

This study introduces a new pulse width modulation (PWM) method to reduce common-mode voltages (CMVs) and then compares its performance with other reduced CMV-PWM (RCMV-PWM) methods. CMVs should be reduced to ensure the electromagnetic compatibility and safety of grid-connected inverters. RCMV-PWM methods attempt to synthesize voltage references without zero vectors, which cause high CMV peaks. In these methods, the peak-to-peak magnitude of CMVs can be reduced by one-third of the conventional space-vector PWM. The introduced method splits every reference vector into two vectors to avoid the use of zero vectors. The performances of the RCMV-PWM methods are analyzed in accordance with the modulation index through simulation and experiment.

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References

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