Control strategy for three‑phase converters under unbalanced grid conditions with closed‑loop compensation

Jeongjun Seo; Sunghyuk Choi; Jung-Ik Ha

Control strategy for three‑phase converters under unbalanced grid conditions with closed‑loop compensation

Jeongjun Seo

Sunghyuk Choi

Jung-Ik Ha

Vol. 25, No. 3, pp. 469-479, Mar. 2025

10.1007/s43236-025-00996-5

Closed loop compensation

Current reference compensation

Line-to-line voltage

Unbalance grid

Abstract

This paper proposes a closed-loop compensation method to minimize the active power ripples in three-phase converters under unbalanced grid conditions. Most of the previous studies attempted to reduce power ripples by using grid voltage information to change the current references. However, due to parameter errors or line impedances, it is challenging to completely eliminate the power ripples caused by unbalanced grid conditions. In this paper, in addition to changing current references using grid voltage information, a closed-loop compensation method that measures instantaneous power ripples for compensation is proposed. This method reduces power ripples in unbalanced grid conditions during the steady-state and improves the power control performance during transition situations. Moreover, the proposed control algorithm only uses line-to-line voltages. It does not employ the extraction of positive and negative sequence components, making it simpler to implement than conventional open-loop methods. Experimental results verify the validity and effectiveness of the proposed method.

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Cite this article

[IEEE Style]

J. Seo, S. Choi, J. Ha, "Control strategy for three‑phase converters under unbalanced grid conditions with closed‑loop compensation," Journal of Power Electronics, vol. 25, no. 3, pp. 469-479, 2025. DOI: 10.1007/s43236-025-00996-5.

[ACM Style]

Jeongjun Seo, Sunghyuk Choi, and Jung-Ik Ha. 2025. Control strategy for three‑phase converters under unbalanced grid conditions with closed‑loop compensation. Journal of Power Electronics, 25, 3, (2025), 469-479. DOI: 10.1007/s43236-025-00996-5.