A CSI-Fed PMSM Drive System With Single-Stage Operation for Extended Constant-Torque Range

Yang Xu, Zheng Wang, Yinzhen Shen, Jiangbiao He, Giampaolo Buticchi

Research output: Contribution to journalArticlepeer-review


Aiming at extending the constant-torque region, a high-performance single-stage control strategy is proposed for the current-source inverter (CSI) fed permanent-magnet synchronous motor (PMSM) drive system in this article. Different from traditional CSI-fed motor drives, both the dc-link current and the motor speed are regulated by the CSI for single-stage operation. A novel cascaded closed-loop control structure is proposed, where the speed controller and the dc-link current controller are designed as the outer and inner loops, respectively. The input dc voltage can be boosted for higher terminal voltages of PMSM, and the constant-torque operation range is extended and the efficiency is improved for the CSI-fed drive due to the avoidance of flux-weakening operation. Moreover, the cascaded closed-loop current controller is developed, which can suppress the <italic>LC</italic> resonance excited by low-order current harmonics in the single-stage operation. To achieve the smooth transition between the two-stage operation in the low-speed region and the single-stage operation in the high-speed region, a hysteresis comparator-based switching strategy is proposed. Experiments have been conducted to verify the effectiveness of the boost feature of CSI and the proposed control scheme.

Original languageEnglish
Pages (from-to)1-13
Number of pages13
JournalIEEE Transactions on Industrial Electronics
StateAccepted/In press - 2023

Bibliographical note

Publisher Copyright:


  • Boost operation
  • Capacitors
  • controller design
  • current-source inverter (CSI)
  • Hysteresis motors
  • Inductors
  • Inverters
  • Modulation
  • Motor drives
  • permanent-magnet synchronous motor (PMSM) drive
  • single-stage operation
  • Voltage control

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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