Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Design of imbalance compensator to mitigate circulating currents under master-slave operation of inverters

  • Seungbo Choi (Graduate School of Energy Convergence, Gwangju Institute of Science and Technology (GIST)) ;
  • Hankyu Hwang (Graduate School of Energy Convergence, Gwangju Institute of Science and Technology (GIST)) ;
  • Yongsoon Park (Graduate School of Energy Convergence, Gwangju Institute of Science and Technology (GIST))
  • Received : 2022.11.14
  • Accepted : 2023.02.14
  • Published : 2023.05.20
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Abstract

Circulating current should be minimized when multiple inverters are paralleled for power sharing. In this paper, the circulating current problem is discussed for a target system, where a common DC-link is given for two paralleled inverters to drive a single motor. Through a circuit analysis, the transfer-delay differences and unbalanced impedances are identified as two main factors causing circulating current. After the actual conditions of the target system are examined, it is discussed how to design an imbalance compensator to mitigate circulating currents under master-slave operations. In addition, a gain setting is suggested for the compensator to implement an intended response. Finally, the proposed compensating method is assessed with experimental results obtained under diverse operating conditions.

Keywords

Acknowledgement

This work was supported in part by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20203030020200), and (No. 20204010600340).

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