Design of imbalance compensator to mitigate circulating currents under master–slave operation of inverters

Seungbo Choi; Hankyu Hwang; Yongsoon Park

Design of imbalance compensator to mitigate circulating currents under master–slave operation of inverters

Seungbo Choi

Hankyu Hwang

Yongsoon Park

Vol. 23, No. 5, pp. 870-880, May 2023

10.1007/s43236-023-00619-x

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.

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Cite this article

[IEEE Style]

S. Choi, H. Hwang, Y. Park, "Design of imbalance compensator to mitigate circulating currents under master–slave operation of inverters," Journal of Power Electronics, vol. 23, no. 5, pp. 870-880, 2023. DOI: 10.1007/s43236-023-00619-x.

[ACM Style]

Seungbo Choi, Hankyu Hwang, and Yongsoon Park. 2023. Design of imbalance compensator to mitigate circulating currents under master–slave operation of inverters. Journal of Power Electronics, 23, 5, (2023), 870-880. DOI: 10.1007/s43236-023-00619-x.