Reduction of Common-Mode Voltage in Multiphase Two-Level Inverters Using SPWM with Phase-Shifted Carriers

Zicheng Liu, Zedong Zheng, Scott D. Sudhoff, Chunyang Gu, Yongdong Li

Research output: Journal PublicationArticlepeer-review

108 Citations (Scopus)


The increasing interest in multiphase drive systems has led to the extension of inverter topologies and pulse width modulation (PWM) methods from three-phase to multiphase occasions. Carrier-based PWM (CPWM) dominates space vector PWM when the phase number increases, because of its simple computation and modular implementation. Although intensive work has been done on modifying PWM methods to reduce the common-mode voltage (CMV), not enough work has been done on CPWM methods with CMV reduction for multiphase drives. This paper extends the phase-shifted sinusoidal PWM (PS-SPWM) method for five-phase and six-phase two-level voltage-source inverters (VSI) and employs the intersection-plotting method and Fourier analysis to reveal the nature of the CMV. Both experiment and simulation results comply with theoretical analysis that compared with the conventional SPWM, the PS-SPWM can effectively reduce the CMV in peak-to-peak value and RMS value, though it leads to a higher phase current distortion. In addition, the hardware realization of PS-SPWM for multiphase inverters by a distributed control system is presented in this paper.

Original languageEnglish
Article number7323848
Pages (from-to)6631-6645
Number of pages15
JournalIEEE Transactions on Power Electronics
Issue number9
Publication statusPublished - Sept 2016


  • Common mode voltage (CMV)
  • multiphase voltage source inverter (MVSI)
  • sinusoidal pulse width modulation (SPWM)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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