Assisted Power Transfer for Voltage Balance of Bipolar DC Micro-Grids Using Inactive Motor Drives

Jiadong Lu, Yihua Hu, Yuge Song, Yue Su, Jie Wang, Jinglin Liu

Research output: Contribution to journalArticlepeer-review


A voltage balancer remains a good solution of power transfer for bipolar DC grids, which however would increase the costs due to its requirement for additional hardware support. In this paper, an auxiliary power transfer strategy was proposed by using he inactive motor drives affiliated with the bipolar DC grid. During idle periods of the motor drive, one inverter bridge arm was connected with the bipolar DC grid at their neutral points, allowing bidirectional power transfer between the upper and lower DC-bus sources. The proposed strategy shared part of the voltage balancer's power transfer burden without requiring additional hardware and affecting the normal operations of the motor drive. In addition, its effectiveness was verified by experimental results on an IPMSM drive, showing that the power flows among the upper and lower DC-bus power supplies were controlled effectively. Also, the active control of the DC-bus voltages could be achieved by modulation of the phase currents.

Original languageEnglish
Pages (from-to)12129-12139
JournalIEEE Transactions on Industrial Electronics
Issue number12
Publication statusPublished - 29 Dec 2021

Bibliographical note

Publisher Copyright:


  • AC motors
  • Bipolar DC-bus
  • Connectors
  • Inductors
  • Insulated gate bipolar transistors
  • interior permanent magnet synchronous motor (IPMSM)
  • inverter
  • Motor drives
  • power flow
  • Topology
  • voltage balance
  • Voltage control

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