Soft‑switching modulation algorithm‑based reconfiguration of cascaded H‑bridge inverters under DC source failures


Vol. 21, No. 7, pp. 998-1008, Jul. 2021
10.1007/s43236-021-00251-7




 Abstract

Cascaded H-bridge inverters with separated DC sources charging the DC-link are widely used in the industry application due to its inherent advantages. However, a failure of the DC sources can interrupt the power supply which results in economic loss. This paper proposes a soft-switching modulation algorithm to tackle this issue. A pre-set table lists all of the possible redundant module states that can adjust the voltage of the DC-link. With this method, the DC voltages can be always balanced even under DC source failures, resulting in good flexibility, good dynamic performance and no voltage level-skip. Hence, a reliable and continuous power supply is guaranteed. Finally, 3-module experimental results verify the validity of the proposed method and simulation tests are used to verify its balance limitations.


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Cite this article

[IEEE Style]

J. Xiong, F. Zhou, Q. Li, "Soft‑switching modulation algorithm‑based reconfiguration of cascaded H‑bridge inverters under DC source failures," Journal of Power Electronics, vol. 21, no. 7, pp. 998-1008, 2021. DOI: 10.1007/s43236-021-00251-7.

[ACM Style]

Jinfei Xiong, Fulin Zhou, and Qunzhan Li. 2021. Soft‑switching modulation algorithm‑based reconfiguration of cascaded H‑bridge inverters under DC source failures. Journal of Power Electronics, 21, 7, (2021), 998-1008. DOI: 10.1007/s43236-021-00251-7.