Voltage balance strategy for DC‑port failures of three‑phase cascaded H‑bridge rectifiers based on negative sequence current injection

The three-phase cascaded H-bridge rectifier (CHBR) is widely used in high power and high voltage applications. This paper focuses on the load removed from the DC port of a three-phase CHBR, which can cause single-phase DC-port voltage unbalance issues and three-phases DC-port voltage unbalance issues. This paper proposes a voltage balance control strategy based on negative sequence current injection for three-phase CHBR to deal with the unbalance problem. An individual DC-port voltage control strategy is designed to balance the DC-port voltage in the faulty phase. In addition, a negative sequence current injection control strategy is responsible for balancing the DC-port voltages in the three phase CHBR. The effectiveness and feasibility of the proposed voltage control strategy based on negative sequence current injection is verified by the experimental results.

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Cite this article

[IEEE Style]

X. Liu, X. Liang, K. Gong, S. An, X. Peng, J. Cai, X. Zhu, C. Zhou, "Voltage balance strategy for DC‑port failures of three‑phase cascaded H‑bridge rectifiers based on negative sequence current injection," Journal of Power Electronics, vol. 22, no. 8, pp. 1242-1254, 2022. DOI: 10.1007/s43236-022-00445-7.

[ACM Style]

Xiaohan Liu, Xiao Liang, Kaiyue Gong, Siqi An, Xu Peng, Jun Cai, Xinyu Zhu, and Chao Zhou. 2022. Voltage balance strategy for DC‑port failures of three‑phase cascaded H‑bridge rectifiers based on negative sequence current injection. Journal of Power Electronics, 22, 8, (2022), 1242-1254. DOI: 10.1007/s43236-022-00445-7.