Negative sequence control for DC voltage balancing in three‑phase cascaded H‑bridge rectifiers considering DC‑port failures

As a vital component of power electronic transformers (PET), the reliability of a cascaded H-bridge rectifier (CHBR) is essential. Therefore, in this paper, a DC-port voltage balance strategy considering DC-port failure is researched to ensure the stable operation of a CHBR. However, if the DC-port voltage balance strategy is adopted to realize the single-phase balance of a CHBR, the three-phase currents become unbalanced. This paper uses a negative sequence control (NSC) strategy that is conducive to balancing DC-port voltage to achieve three-phase current balance. For the DC-port voltage balance, the matrix generation modulation (MGM) algorithm is proposed. In addition, the DC-port voltage balance boundary is analyzed to determine the range of the DC-port voltage balance in the CHBR. A 3-module cascading topology is adopted to demonstrate the MGM algorithm and the NSC strategy. Through experiments, results show the correctness and feasibility of the proposed strategy.

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Cite this article

[IEEE Style]

X. Zhu, X. Liang, K. Gong, X. Peng, J. Cai, X. Liu, C. Zhou, S. An, C. Wu, P. Han, "Negative sequence control for DC voltage balancing in three‑phase cascaded H‑bridge rectifiers considering DC‑port failures," Journal of Power Electronics, vol. 22, no. 12, pp. 2025-2038, 2022. DOI: 10.1007/s43236-022-00503-0.

[ACM Style]

Xinyu Zhu, Xiao Liang, Kaiyue Gong, Xu Peng, Jun Cai, Xiaohan Liu, Chao Zhou, Siqi An, Chao Wu, and Pengcheng Han. 2022. Negative sequence control for DC voltage balancing in three‑phase cascaded H‑bridge rectifiers considering DC‑port failures. Journal of Power Electronics, 22, 12, (2022), 2025-2038. DOI: 10.1007/s43236-022-00503-0.