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Voltage Space Vector Equivalent Substitution Fault-Tolerance Control for Cascaded H-Bridge Multilevel Inverter with Current-Tracking

by Guohua Li 1,2,*, Chunwu Liu 1,* and Yufeng Wang 1
1
Faculty of Electrical and Control Engineering, Liaoning Technical University, Huludao 125105, China
2
College of Mechanical Engineering, Liaoning Technical University, Fuxin 123000, China
*
Authors to whom correspondence should be addressed.
Electronics 2020, 9(1), 93; https://doi.org/10.3390/electronics9010093
Received: 12 December 2019 / Revised: 27 December 2019 / Accepted: 28 December 2019 / Published: 2 January 2020
(This article belongs to the Special Issue Multilevel Converters)
A novel fault-tolerant control method based on the equivalent substitution of voltage space vector for cascaded H-bridge multilevel inverter with current-tracking is proposed in this paper. With this method, the fault effects on the voltage vector of each sector of the cascaded inverter is analyzed first. Then, an algorithm to substitute the voltage vector in fault state is developed. In the fault state, if the voltage vector selected by the original algorithm cannot be used normally, the redundant voltage vector with the position coincidence is preferentially selected for equivalent substitution. If there is no redundant coincidence vector, select the other vector whose position and effect are closest to it. Compared with the commonly used N + 1 redundancy method, this method does not require the spare cascaded units and can be applied to any class cascaded H-bridge multilevel inverter with current-tracking to improve its reliability. Finally, the effectiveness of the proposed method is validated by simulation and experiment results. View Full-Text
Keywords: current-tracking; equivalent substitution; fault-tolerance; multilevel inverter current-tracking; equivalent substitution; fault-tolerance; multilevel inverter
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Li, G.; Liu, C.; Wang, Y. Voltage Space Vector Equivalent Substitution Fault-Tolerance Control for Cascaded H-Bridge Multilevel Inverter with Current-Tracking. Electronics 2020, 9, 93.

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