Common-Mode Voltage Reduction and Fault-Tolerant Operation of Four-Leg CSI-Fed Motor Drives

Yang Xu, Zheng Wang, Chuhan Li, Jiangbiao He

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


This letter proposes a four-leg current-source inverter (CSI) fed three-phase motor drive. Different from the previous four-leg CSI inverter, the proposed configuration introduces the fourth leg in CSI, which connects to the neutral point of the motor through an extra output filter capacitor. Therefore, the proposed configuration can not only reduce the common-mode voltage (CMV) under the normal condition, but also provide the fault-tolerant operation ability under open-circuit faults in windings and switches. The dedicated space vector modulation (SVM) strategies have been designed. Compared with prior research on CMV reduction, the four-leg method has the full range of modulation index and will not increase any harmonics in the currents. Meanwhile, the fault-tolerant ability is offered, which can further enhance the reliability of the motor drive. A laboratory prototype has been built to experimentally verify the effectiveness of the proposed motor drive topology and the control schemes.

Original languageEnglish
Article number9320604
Pages (from-to)8570-8574
Number of pages5
JournalIEEE Transactions on Power Electronics
Issue number8
StatePublished - Aug 2021

Bibliographical note

Funding Information:
Manuscript received November 21, 2020; revised December 18, 2020; accepted January 8, 2021. Date of publication January 12, 2021; date of current version May 5, 2021. This work was supported in part by the Jiangsu Natural Science Foundation of China under Grant BK20180013 and in part by the Shenzhen Science and Technology Innovation Committee (STIC) under Grant JCYJ20180306174439784. (Corresponding author: Zheng Wang.) Yang Xu, Zheng Wang, and Chuhan Li are with the School of Electrical Engineering, Southeast University, Nanjing 210096, China (e-mail:;;

Publisher Copyright:
© 1986-2012 IEEE.


  • Common-mode voltage (CMV)
  • fault-tolerant, four-leg current-source inverter (CSI), motor drives, space vector modulation (SVM)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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