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http://dx.doi.org/10.1007/s43236-021-00251-7

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

Xiong, Jinfei (School of Electrical Engineering, Southwest Jiaotong University)
Zhou, Fulin (School of Electrical Engineering, Southwest Jiaotong University)
Li, Qunzhan (School of Electrical Engineering, Southwest Jiaotong University)
Publication Information
Journal of Power Electronics / v.21, no.7, 2021 , pp. 998-1008 More about this Journal
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.
Keywords
Soft-switching modulation; CHBI; DC source failure;
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